WO2012121393A1 - 有機半導体材料 - Google Patents
有機半導体材料 Download PDFInfo
- Publication number
- WO2012121393A1 WO2012121393A1 PCT/JP2012/056184 JP2012056184W WO2012121393A1 WO 2012121393 A1 WO2012121393 A1 WO 2012121393A1 JP 2012056184 W JP2012056184 W JP 2012056184W WO 2012121393 A1 WO2012121393 A1 WO 2012121393A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- phase
- unit
- organic semiconductor
- liquid crystal
- semiconductor material
- Prior art date
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 106
- 239000000463 material Substances 0.000 title claims abstract description 100
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 176
- 125000003118 aryl group Chemical class 0.000 claims abstract description 19
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 15
- 239000013078 crystal Substances 0.000 claims description 91
- 238000000034 method Methods 0.000 claims description 62
- 230000008569 process Effects 0.000 claims description 16
- 150000002430 hydrocarbons Chemical class 0.000 claims description 13
- 125000004432 carbon atom Chemical group C* 0.000 claims description 11
- 125000005842 heteroatom Chemical group 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 229910052717 sulfur Inorganic materials 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims description 4
- 229930195733 hydrocarbon Natural products 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 3
- 150000001721 carbon Chemical group 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 16
- 239000012071 phase Substances 0.000 description 342
- 239000000126 substance Substances 0.000 description 107
- 150000001875 compounds Chemical class 0.000 description 101
- 230000010287 polarization Effects 0.000 description 62
- 230000037230 mobility Effects 0.000 description 55
- 239000000243 solution Substances 0.000 description 54
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 46
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 36
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 35
- FCEHBMOGCRZNNI-UHFFFAOYSA-N 1-benzothiophene Chemical compound C1=CC=C2SC=CC2=C1 FCEHBMOGCRZNNI-UHFFFAOYSA-N 0.000 description 34
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 32
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 30
- 239000010409 thin film Substances 0.000 description 30
- 238000005160 1H NMR spectroscopy Methods 0.000 description 27
- 239000007787 solid Substances 0.000 description 26
- 239000004990 Smectic liquid crystal Substances 0.000 description 24
- 238000006243 chemical reaction Methods 0.000 description 22
- 239000000203 mixture Substances 0.000 description 22
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 20
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 16
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 16
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 16
- -1 thiopehene Chemical compound 0.000 description 16
- 210000004027 cell Anatomy 0.000 description 15
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 15
- 235000019341 magnesium sulphate Nutrition 0.000 description 15
- 239000000758 substrate Substances 0.000 description 15
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 14
- 230000015572 biosynthetic process Effects 0.000 description 14
- 238000003786 synthesis reaction Methods 0.000 description 14
- 238000004440 column chromatography Methods 0.000 description 13
- 238000002366 time-of-flight method Methods 0.000 description 13
- 238000012546 transfer Methods 0.000 description 13
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 12
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- HEDRZPFGACZZDS-MICDWDOJSA-N Trichloro(2H)methane Chemical compound [2H]C(Cl)(Cl)Cl HEDRZPFGACZZDS-MICDWDOJSA-N 0.000 description 12
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 12
- 239000000741 silica gel Substances 0.000 description 12
- 229910002027 silica gel Inorganic materials 0.000 description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 11
- 230000001747 exhibiting effect Effects 0.000 description 11
- 239000010410 layer Substances 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000013461 design Methods 0.000 description 10
- HXITXNWTGFUOAU-UHFFFAOYSA-N phenylboronic acid Chemical compound OB(O)C1=CC=CC=C1 HXITXNWTGFUOAU-UHFFFAOYSA-N 0.000 description 10
- FYSNRJHAOHDILO-UHFFFAOYSA-N thionyl chloride Chemical compound ClS(Cl)=O FYSNRJHAOHDILO-UHFFFAOYSA-N 0.000 description 10
- 230000001052 transient effect Effects 0.000 description 10
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 9
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 9
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 9
- 238000004770 highest occupied molecular orbital Methods 0.000 description 9
- 238000004768 lowest unoccupied molecular orbital Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 9
- 230000008018 melting Effects 0.000 description 9
- 238000002844 melting Methods 0.000 description 9
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 9
- 238000012216 screening Methods 0.000 description 9
- 239000002904 solvent Substances 0.000 description 9
- 125000001424 substituent group Chemical group 0.000 description 9
- NQRYJNQNLNOLGT-UHFFFAOYSA-N Piperidine Chemical compound C1CCNCC1 NQRYJNQNLNOLGT-UHFFFAOYSA-N 0.000 description 8
- 229910052786 argon Inorganic materials 0.000 description 8
- 239000012300 argon atmosphere Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 8
- HGCIXCUEYOPUTN-UHFFFAOYSA-N cyclohexene Chemical compound C1CCC=CC1 HGCIXCUEYOPUTN-UHFFFAOYSA-N 0.000 description 8
- LPIQUOYDBNQMRZ-UHFFFAOYSA-N cyclopentene Chemical compound C1CC=CC1 LPIQUOYDBNQMRZ-UHFFFAOYSA-N 0.000 description 8
- 239000012535 impurity Substances 0.000 description 8
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 7
- FJDQFPXHSGXQBY-UHFFFAOYSA-L caesium carbonate Chemical compound [Cs+].[Cs+].[O-]C([O-])=O FJDQFPXHSGXQBY-UHFFFAOYSA-L 0.000 description 7
- 229910000024 caesium carbonate Inorganic materials 0.000 description 7
- 239000007795 chemical reaction product Substances 0.000 description 7
- 238000002425 crystallisation Methods 0.000 description 7
- 230000008025 crystallization Effects 0.000 description 7
- 239000010408 film Substances 0.000 description 7
- 125000000623 heterocyclic group Chemical group 0.000 description 7
- 229930192474 thiophene Natural products 0.000 description 7
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 6
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 6
- RWRDLPDLKQPQOW-UHFFFAOYSA-N Pyrrolidine Chemical compound C1CCNC1 RWRDLPDLKQPQOW-UHFFFAOYSA-N 0.000 description 6
- IOJUPLGTWVMSFF-UHFFFAOYSA-N benzothiazole Chemical compound C1=CC=C2SC=NC2=C1 IOJUPLGTWVMSFF-UHFFFAOYSA-N 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- RGSFGYAAUTVSQA-UHFFFAOYSA-N pentamethylene Natural products C1CCCC1 RGSFGYAAUTVSQA-UHFFFAOYSA-N 0.000 description 6
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 6
- 230000007704 transition Effects 0.000 description 6
- LWIHDJKSTIGBAC-UHFFFAOYSA-K tripotassium phosphate Chemical compound [K+].[K+].[K+].[O-]P([O-])([O-])=O LWIHDJKSTIGBAC-UHFFFAOYSA-K 0.000 description 6
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- ZYZWOSIRFVIBRH-UHFFFAOYSA-N chloroform;cyclohexane Chemical compound ClC(Cl)Cl.C1CCCCC1 ZYZWOSIRFVIBRH-UHFFFAOYSA-N 0.000 description 5
- 238000012790 confirmation Methods 0.000 description 5
- NQGIJDNPUZEBRU-UHFFFAOYSA-N dodecanoyl chloride Chemical compound CCCCCCCCCCCC(Cl)=O NQGIJDNPUZEBRU-UHFFFAOYSA-N 0.000 description 5
- 239000003480 eluent Substances 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000001000 micrograph Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 239000003960 organic solvent Substances 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 5
- 238000001953 recrystallisation Methods 0.000 description 5
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical class O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 4
- 0 CC1(c2ccccc2SC11)SC(C2)=C1C=CC2(C)c1ccc(*)[s]1 Chemical compound CC1(c2ccccc2SC11)SC(C2)=C1C=CC2(C)c1ccc(*)[s]1 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000006069 Suzuki reaction reaction Methods 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000002052 molecular layer Substances 0.000 description 4
- 239000012044 organic layer Substances 0.000 description 4
- SCVFZCLFOSHCOH-UHFFFAOYSA-M potassium acetate Chemical compound [K+].CC([O-])=O SCVFZCLFOSHCOH-UHFFFAOYSA-M 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 238000010898 silica gel chromatography Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 3
- 125000002723 alicyclic group Chemical group 0.000 description 3
- 125000000217 alkyl group Chemical group 0.000 description 3
- 150000001491 aromatic compounds Chemical class 0.000 description 3
- 239000004305 biphenyl Substances 0.000 description 3
- 235000010290 biphenyl Nutrition 0.000 description 3
- 239000012267 brine Substances 0.000 description 3
- 230000005587 bubbling Effects 0.000 description 3
- XJHCXCQVJFPJIK-UHFFFAOYSA-M caesium fluoride Chemical compound [F-].[Cs+] XJHCXCQVJFPJIK-UHFFFAOYSA-M 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- RMBPEFMHABBEKP-UHFFFAOYSA-N fluorene Chemical compound C1=CC=C2C3=C[CH]C=CC3=CC2=C1 RMBPEFMHABBEKP-UHFFFAOYSA-N 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- QOOSFVFWJXNCTP-UHFFFAOYSA-N naphtho[2,3-f][1]benzothiole Chemical compound C1=CC=C2C=C(C=C3C(C=CS3)=C3)C3=CC2=C1 QOOSFVFWJXNCTP-UHFFFAOYSA-N 0.000 description 3
- 125000004433 nitrogen atom Chemical group N* 0.000 description 3
- NIHNNTQXNPWCJQ-UHFFFAOYSA-N o-biphenylenemethane Natural products C1=CC=C2CC3=CC=CC=C3C2=C1 NIHNNTQXNPWCJQ-UHFFFAOYSA-N 0.000 description 3
- 239000002243 precursor Substances 0.000 description 3
- 239000011541 reaction mixture Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- VJYJJHQEVLEOFL-UHFFFAOYSA-N thieno[3,2-b]thiophene Chemical compound S1C=CC2=C1C=CS2 VJYJJHQEVLEOFL-UHFFFAOYSA-N 0.000 description 3
- WLPUWLXVBWGYMZ-UHFFFAOYSA-N tricyclohexylphosphine Chemical compound C1CCCCC1P(C1CCCCC1)C1CCCCC1 WLPUWLXVBWGYMZ-UHFFFAOYSA-N 0.000 description 3
- 229910000404 tripotassium phosphate Inorganic materials 0.000 description 3
- 235000019798 tripotassium phosphate Nutrition 0.000 description 3
- CYPYTURSJDMMMP-WVCUSYJESA-N (1e,4e)-1,5-diphenylpenta-1,4-dien-3-one;palladium Chemical compound [Pd].[Pd].C=1C=CC=CC=1\C=C\C(=O)\C=C\C1=CC=CC=C1.C=1C=CC=CC=1\C=C\C(=O)\C=C\C1=CC=CC=C1.C=1C=CC=CC=1\C=C\C(=O)\C=C\C1=CC=CC=C1 CYPYTURSJDMMMP-WVCUSYJESA-N 0.000 description 2
- KZPYGQFFRCFCPP-UHFFFAOYSA-N 1,1'-bis(diphenylphosphino)ferrocene Chemical compound [Fe+2].C1=CC=C[C-]1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=C[C-]1P(C=1C=CC=CC=1)C1=CC=CC=C1 KZPYGQFFRCFCPP-UHFFFAOYSA-N 0.000 description 2
- KVNYFPKFSJIPBJ-UHFFFAOYSA-N 1,2-diethylbenzene Chemical compound CCC1=CC=CC=C1CC KVNYFPKFSJIPBJ-UHFFFAOYSA-N 0.000 description 2
- VJYJBBMMLIDJEF-UHFFFAOYSA-N 1-benzothiophen-2-amine Chemical compound C1=CC=C2SC(N)=CC2=C1 VJYJBBMMLIDJEF-UHFFFAOYSA-N 0.000 description 2
- OXMIDRBAFOEOQT-UHFFFAOYSA-N 2,5-dimethyloxolane Chemical compound CC1CCC(C)O1 OXMIDRBAFOEOQT-UHFFFAOYSA-N 0.000 description 2
- PYXBCVWIECUMDW-UHFFFAOYSA-N 2-bromoanthracene Chemical compound C1=CC=CC2=CC3=CC(Br)=CC=C3C=C21 PYXBCVWIECUMDW-UHFFFAOYSA-N 0.000 description 2
- IMRWILPUOVGIMU-UHFFFAOYSA-N 2-bromopyridine Chemical compound BrC1=CC=CC=N1 IMRWILPUOVGIMU-UHFFFAOYSA-N 0.000 description 2
- GHZJGHMAQSMLIT-UHFFFAOYSA-N 2-ethyl-[1]benzothiolo[3,2-b][1]benzothiole Chemical compound C12=CC=CC=C2SC2=C1SC1=CC(CC)=CC=C21 GHZJGHMAQSMLIT-UHFFFAOYSA-N 0.000 description 2
- KOSQBPCKJHGOLT-UHFFFAOYSA-N 7-ethyl-2-iodo-[1]benzothiolo[3,2-b][1]benzothiole Chemical compound C12=CC=C(I)C=C2SC2=C1SC1=CC(CC)=CC=C21 KOSQBPCKJHGOLT-UHFFFAOYSA-N 0.000 description 2
- TZVWWDLPBYYGJN-UHFFFAOYSA-N 7-ethyl-[1]benzothiolo[3,2-b][1]benzothiol-2-amine Chemical compound C12=CC=C(N)C=C2SC2=C1SC1=CC(CC)=CC=C21 TZVWWDLPBYYGJN-UHFFFAOYSA-N 0.000 description 2
- UJOBWOGCFQCDNV-UHFFFAOYSA-N 9H-carbazole Chemical compound C1=CC=C2C3=CC=CC=C3NC2=C1 UJOBWOGCFQCDNV-UHFFFAOYSA-N 0.000 description 2
- 101000632319 Homo sapiens Septin-7 Proteins 0.000 description 2
- 229910010082 LiAlH Inorganic materials 0.000 description 2
- 238000005481 NMR spectroscopy Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 102100027981 Septin-7 Human genes 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- DHXVGJBLRPWPCS-UHFFFAOYSA-N Tetrahydropyran Chemical compound C1CCOCC1 DHXVGJBLRPWPCS-UHFFFAOYSA-N 0.000 description 2
- GCTFWCDSFPMHHS-UHFFFAOYSA-M Tributyltin chloride Chemical compound CCCC[Sn](Cl)(CCCC)CCCC GCTFWCDSFPMHHS-UHFFFAOYSA-M 0.000 description 2
- NXCSDJOTXUWERI-UHFFFAOYSA-N [1]benzothiolo[3,2-b][1]benzothiole Chemical compound C12=CC=CC=C2SC2=C1SC1=CC=CC=C21 NXCSDJOTXUWERI-UHFFFAOYSA-N 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 150000007824 aliphatic compounds Chemical class 0.000 description 2
- 125000003342 alkenyl group Chemical group 0.000 description 2
- 125000000304 alkynyl group Chemical group 0.000 description 2
- 235000019270 ammonium chloride Nutrition 0.000 description 2
- 230000006399 behavior Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- IPWKHHSGDUIRAH-UHFFFAOYSA-N bis(pinacolato)diboron Chemical compound O1C(C)(C)C(C)(C)OB1B1OC(C)(C)C(C)(C)O1 IPWKHHSGDUIRAH-UHFFFAOYSA-N 0.000 description 2
- ZADPBFCGQRWHPN-UHFFFAOYSA-N boronic acid Chemical compound OBO ZADPBFCGQRWHPN-UHFFFAOYSA-N 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 239000002800 charge carrier Substances 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 150000001923 cyclic compounds Chemical class 0.000 description 2
- 150000001925 cycloalkenes Chemical class 0.000 description 2
- MWKFXSUHUHTGQN-UHFFFAOYSA-N decan-1-ol Chemical compound CCCCCCCCCCO MWKFXSUHUHTGQN-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- LQZZUXJYWNFBMV-UHFFFAOYSA-N dodecan-1-ol Chemical compound CCCCCCCCCCCCO LQZZUXJYWNFBMV-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 125000005843 halogen group Chemical group 0.000 description 2
- ZSIAUFGUXNUGDI-UHFFFAOYSA-N hexan-1-ol Chemical group CCCCCCO ZSIAUFGUXNUGDI-UHFFFAOYSA-N 0.000 description 2
- VKOBVWXKNCXXDE-UHFFFAOYSA-N icosanoic acid Chemical compound CCCCCCCCCCCCCCCCCCCC(O)=O VKOBVWXKNCXXDE-UHFFFAOYSA-N 0.000 description 2
- 230000001976 improved effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 125000004430 oxygen atom Chemical group O* 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 108091008695 photoreceptors Proteins 0.000 description 2
- 235000011056 potassium acetate Nutrition 0.000 description 2
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- GXDSJIXEDZEDQL-UHFFFAOYSA-N naphtho[2,3-f][1]benzothiole-5,10-dione Chemical compound C1=C2C(=O)C3=CC=CC=C3C(=O)C2=CC2=C1C=CS2 GXDSJIXEDZEDQL-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- PIDFDZJZLOTZTM-KHVQSSSXSA-N ombitasvir Chemical compound COC(=O)N[C@@H](C(C)C)C(=O)N1CCC[C@H]1C(=O)NC1=CC=C([C@H]2N([C@@H](CC2)C=2C=CC(NC(=O)[C@H]3N(CCC3)C(=O)[C@@H](NC(=O)OC)C(C)C)=CC=2)C=2C=CC(=CC=2)C(C)(C)C)C=C1 PIDFDZJZLOTZTM-KHVQSSSXSA-N 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 1
- YJVFFLUZDVXJQI-UHFFFAOYSA-L palladium(ii) acetate Chemical compound [Pd+2].CC([O-])=O.CC([O-])=O YJVFFLUZDVXJQI-UHFFFAOYSA-L 0.000 description 1
- SLIUAWYAILUBJU-UHFFFAOYSA-N pentacene Chemical compound C1=CC=CC2=CC3=CC4=CC5=CC=CC=C5C=C4C=C3C=C21 SLIUAWYAILUBJU-UHFFFAOYSA-N 0.000 description 1
- 125000005062 perfluorophenyl group Chemical group FC1=C(C(=C(C(=C1F)F)F)F)* 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- VYMDGNCVAMGZFE-UHFFFAOYSA-N phenylbutazonum Chemical compound O=C1C(CCCC)C(=O)N(C=2C=CC=CC=2)N1C1=CC=CC=C1 VYMDGNCVAMGZFE-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000011698 potassium fluoride Substances 0.000 description 1
- 235000003270 potassium fluoride Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 229910000108 silver(I,III) oxide Inorganic materials 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- MFRIHAYPQRLWNB-UHFFFAOYSA-N sodium tert-butoxide Chemical compound [Na+].CC(C)(C)[O-] MFRIHAYPQRLWNB-UHFFFAOYSA-N 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000003115 supporting electrolyte Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- IOGXOCVLYRDXLW-UHFFFAOYSA-N tert-butyl nitrite Chemical compound CC(C)(C)ON=O IOGXOCVLYRDXLW-UHFFFAOYSA-N 0.000 description 1
- DZLFLBLQUQXARW-UHFFFAOYSA-N tetrabutylammonium Chemical class CCCC[N+](CCCC)(CCCC)CCCC DZLFLBLQUQXARW-UHFFFAOYSA-N 0.000 description 1
- DPKBAXPHAYBPRL-UHFFFAOYSA-M tetrabutylazanium;iodide Chemical compound [I-].CCCC[N+](CCCC)(CCCC)CCCC DPKBAXPHAYBPRL-UHFFFAOYSA-M 0.000 description 1
- IFLREYGFSNHWGE-UHFFFAOYSA-N tetracene Chemical compound C1=CC=CC2=CC3=CC4=CC=CC=C4C=C3C=C21 IFLREYGFSNHWGE-UHFFFAOYSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- ALYPESYVXOPFNK-UHFFFAOYSA-N thieno[2',3':4,5]thieno[3,2-b]thieno[2',3':4,5]thieno[2,3-d]thiophene Chemical compound C1=CSC2=C1SC1=C2SC2=C1SC1=C2SC=C1 ALYPESYVXOPFNK-UHFFFAOYSA-N 0.000 description 1
- URMVZUQDPPDABD-UHFFFAOYSA-N thieno[2,3-f][1]benzothiole Chemical compound C1=C2SC=CC2=CC2=C1C=CS2 URMVZUQDPPDABD-UHFFFAOYSA-N 0.000 description 1
- OFPPMFSHIKARPG-UHFFFAOYSA-N thieno[3,2-b][1]benzothiole Chemical compound S1C2=CC=CC=C2C2=C1C=CS2 OFPPMFSHIKARPG-UHFFFAOYSA-N 0.000 description 1
- 238000004809 thin layer chromatography Methods 0.000 description 1
- GCYLHKHGKQNXHN-UHFFFAOYSA-N thiophen-2-yltin Chemical compound [Sn]C1=CC=CS1 GCYLHKHGKQNXHN-UHFFFAOYSA-N 0.000 description 1
- WSEJZRIZDQWMKQ-UHFFFAOYSA-N thiophene-2,3-dicarbaldehyde Chemical compound O=CC=1C=CSC=1C=O WSEJZRIZDQWMKQ-UHFFFAOYSA-N 0.000 description 1
- NARJDRPPKFRVEJ-UHFFFAOYSA-N tributyl(naphtho[2,3-f][1]benzothiol-2-yl)stannane Chemical compound C1=CC=C2C=C(C=C3C(C=C(S3)[Sn](CCCC)(CCCC)CCCC)=C3)C3=CC2=C1 NARJDRPPKFRVEJ-UHFFFAOYSA-N 0.000 description 1
- WFFUXODEBRWZNO-UHFFFAOYSA-N tributyl-(5-hexylthiophen-2-yl)stannane Chemical compound CCCCCCC1=CC=C([Sn](CCCC)(CCCC)CCCC)S1 WFFUXODEBRWZNO-UHFFFAOYSA-N 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D495/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms
- C07D495/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having sulfur atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
- C07D495/04—Ortho-condensed systems
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having potential barriers
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/654—Aromatic compounds comprising a hetero atom comprising only nitrogen as heteroatom
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/655—Aromatic compounds comprising a hetero atom comprising only sulfur as heteroatom
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6572—Polycyclic condensed heteroaromatic hydrocarbons comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6574—Polycyclic condensed heteroaromatic hydrocarbons comprising only oxygen in the heteroaromatic polycondensed ring system, e.g. cumarine dyes
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/60—Organic compounds having low molecular weight
- H10K85/649—Aromatic compounds comprising a hetero atom
- H10K85/657—Polycyclic condensed heteroaromatic hydrocarbons
- H10K85/6576—Polycyclic condensed heteroaromatic hydrocarbons comprising only sulfur in the heteroaromatic polycondensed ring system, e.g. benzothiophene
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- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/731—Liquid crystalline materials
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- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having potential barriers
- H10K10/40—Organic transistors
- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
- H10K10/484—Insulated gate field-effect transistors [IGFETs] characterised by the channel regions
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- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/10—Deposition of organic active material
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- H10K85/60—Organic compounds having low molecular weight
- H10K85/631—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
- H10K85/636—Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom
Definitions
- the present invention relates to an organic semiconductor material that can be suitably used for various devices (for example, organic electronic devices). More specifically, the present invention relates to an organic semiconductor material having liquid crystallinity.
- Organic substances that can transport electronic charges by holes and electrons can be used as organic semiconductors, and organic materials such as photocopier photoreceptors, photosensors, organic EL elements, organic transistors, organic solar cells, and organic memory elements. It can be used as a material for electronic devices.
- the usage form of such a material is generally an amorphous thin film or a polycrystalline thin film.
- the liquid crystal phase of liquid crystal materials that have been considered to be ionic conductivity, electronic conductivity showing a high mobility far exceeding that of an amorphous organic semiconductor has been found, and the liquid crystal phase can be used as an organic semiconductor. It was revealed that there was.
- Liquid crystal materials are positioned as a new type of organic semiconductor that exhibits a high mobility ((10 ⁇ 4 cm 2 / Vs to 1 cm 2 / Vs)) that forms a self-organized molecular aggregate phase (liquid crystal phase).
- Liquid crystal substances are characterized by the fact that alignment defects peculiar to liquid crystals such as domain interfaces and disclinations are difficult to form electrically active levels.
- conventional amorphous organic semiconductor materials and crystalline organic semiconductor materials In fact, it has been clarified to have excellent characteristics that are not seen in the field of electronic devices such as photosensors, electrophotographic photoreceptors, organic EL devices, organic transistors, and organic solar cells. A prototype is being made.
- the liquid crystal material has a great feature that in the liquid crystal phase, it is possible to easily control the molecular orientation, which is generally difficult with a non-liquid crystal material.
- a liquid crystal material when a liquid crystal material is injected between two substrates, such as a liquid crystal cell, generally, at the liquid crystal phase temperature, the liquid crystal molecules generally lie on the surface of the substrate with respect to the molecular long axis.
- the molecular long axis tends to be easily aligned with the substrate surface.
- the thin film of liquid crystal aligned at the liquid crystal phase temperature is phase-changed to the crystal phase by lowering the temperature, thereby controlling the molecular orientation not only in the liquid crystal phase but also in the crystal phase (crystal thin film ) Can be easily produced. This is difficult to realize with a general non-liquid crystalline organic material.
- liquid crystal thin film liquid crystal phase thin film
- a liquid crystal substance can be said to be a material having a high degree of freedom as an organic semiconductor in that it can be applied to an electronic device as an organic semiconductor material not only as a liquid crystal thin film but also as a crystal thin film (for example, Non-Patent Document 1). : Advanced Materials, electronic version, 25 FEB 2011, DOI: 10.1002 / adma.
- An object of the present invention is to provide an organic semiconductor material that solves the above-mentioned drawbacks of the prior art and exhibits not only liquid crystallinity but also high electron mobility.
- the organic semiconductor material of the present invention is based on the above knowledge, and more specifically, a charge transporting molecular unit A having an aromatic condensed ring structure; and a cyclic structure unit B connected to the unit by a single bond. And an organic semiconductor material having unit C as a side chain in at least one of the unit A and the unit B;
- the material exhibits a phase other than the N phase, the SmA phase, and the SmC phase.
- the reason why the organic semiconductor material of the present invention exhibits suitable characteristics can be estimated as follows.
- liquid crystal substances include high-molecular liquid crystals and low-molecular liquid crystals.
- the liquid crystal phase generally has a high viscosity, so that ion conduction tends not to occur.
- a low-order liquid crystal having a strong liquid property such as a nematic phase (N phase), a smectic A phase (SmA phase, hereinafter described in the same manner) or an SmC phase. In the phase, ionic conduction tends to be induced.
- ionized impurity refers to an electrically active impurity (that is, a HOMO level, a LUMO level, or both of them, which can become a trap of ions and charges generated by dissociation of ionic impurities.
- An impurity whose level is between the HOMO and LUMO levels of a liquid crystal substance is ionized by photoionization or charge trapping (for example, M. Funahashi and J. Hanna, Impurity effect on charge carrier transport in smectic liquid crystals, Chem. Phys. Lett., 397,319-323 (2004), H. Ahn, A. Ohno, and J. Hanna, Detection of Trace Amount of Impurity in Smry Liquid Cmrystal J. Appl. Phys., Vol. 44, No. 6A, 2005, pp. 3764-37687.).
- the above-described smectic liquid crystal material that forms a nematic phase or a molecular aggregate layer without molecular arrangement is included in the molecular layer. Since the SmA phase and the SmC phase that do not have order of molecular arrangement have high fluidity, ion conduction is easily induced, which is a big problem when used as an organic semiconductor.
- liquid crystal phase other than N phase, SmA phase and SmC phase having molecular order in the molecular layer, that is, higher-order smectic phase (SmB, SmB cryst , SmI, SmF, SmE, SmJ, SmG, SmK, SmH, and the like) have a characteristic that it is difficult to induce ionic conduction at this point (convenient when used as an organic semiconductor). Further, in general, since the alignment order is high as compared with a low-order liquid crystal phase, it exhibits high mobility. (See H. Ahn, A. Ohno, and J. Hanna, “Impurity effects on charge carrier transport in various mesophases of smectic liquid crystal”, J. Appl. Phys., 102, 093718 (2007)).
- the higher order liquid crystal phase with higher order of molecular arrangement in the smectic phase is higher It has been clarified to show mobility, and from the viewpoint of realizing high mobility as well as suppression of ion conduction, a liquid crystal substance exhibiting a high-order smectic phase is useful as an organic semiconductor.
- a liquid crystal material when used as an organic semiconductor in the form of a crystal thin film, a liquid crystal material in which a low-order liquid crystal phase (N phase, SmA phase, or SmC phase) having a strong liquid property appears in a temperature region immediately above the crystal phase. Then, when the element is heated above the temperature at which the liquid crystal phase appears, there is a big problem that the element is destroyed by heat due to fluidity.
- a liquid crystal substance that expresses a high-order smectic phase having molecular arrangement order in the molecular layer in the temperature region immediately above the crystal phase even when the element is heated to the liquid crystal temperature, the fluidity is high.
- the liquid crystal material Since the device is difficult to be destroyed because it is low, a liquid crystal material exhibiting a higher-order liquid crystal phase is required even when a crystal thin film of a liquid crystal material is applied to an electronic device as an organic semiconductor. Even if it is not a phase, it may be a substance exhibiting a metastable crystal phase). In other words, if the liquid crystal material is a liquid crystal material exhibiting a liquid crystal phase other than a strongly liquid low-order liquid crystal phase (N phase, SmA phase or SmC phase) or a material exhibiting a metastable phase, it is preferably used in the present invention. It can be used.
- the molecular orientation of the liquid crystal phase is ordered as the temperature decreases, so that in a high temperature region, the liquid crystal substance is a low-order liquid crystal phase with strong liquidity ( N phase, SmA phase, and SmC phase) appear, and it is well known that a higher-order liquid crystal phase or metastable crystal phase having the highest orientation order appears in a temperature region adjacent to the crystal phase temperature.
- a liquid crystal phase thin film is used as an organic semiconductor material, it can be used as an organic semiconductor in principle as long as it is a phase other than the above-mentioned strong liquid crystalline low-order liquid crystal phase.
- the aggregated phase appearing in is not a low-order liquid crystal phase (N phase, SmA phase or SmC phase) having a strong liquid property.
- the liquid crystal property in the low liquid crystal phase is strong, so the molecular orientation Is easier to control than the higher-order liquid crystal phase.
- an organic semiconductor material that exhibits not only liquid crystallinity but also high electron mobility is provided.
- 10 is a graph showing an example of a TOF waveform for a compound of Chemical Formula 10. It is a graph which shows an example of the TOF waveform with respect to the compound of Chemical formula 20. It is a graph which shows an example of the TOF waveform with respect to the compound of Chemical formula 28.
- 6 is a graph showing an example of typical transfer characteristics of a transistor manufactured using the compound of Chemical Formula 5.
- 7 is a graph showing an example of typical transfer characteristics of a transistor manufactured using the compound of Chemical Formula 6.
- 10 is a graph showing an example of typical transfer characteristics of a transistor manufactured using the compound of Chemical Formula 9.
- 21 is a graph showing an example of typical transfer characteristics of a transistor manufactured using the compound of Chemical Formula 20.
- 24 is a graph showing an example of typical transfer characteristics of a transistor manufactured using the compound of Chemical Formula 23.
- 32 is a graph illustrating an example of typical transfer characteristics of a transistor manufactured using the compound of Chemical Formula 31.
- A An example of a polarizing microscope photograph showing a polarizing microscope texture at room temperature, and (b) an example of a polarizing microscope photograph showing a polarizing microscope texture of a phase in a high temperature region adjacent to the crystal phase.
- A An example of a polarizing microscope photograph showing a polarizing microscope texture at room temperature, and (b) an example of a polarizing microscope photograph showing a polarizing microscope texture of a phase in a high temperature region adjacent to the crystal phase.
- A An example of a polarizing microscope photograph showing a polarizing microscope texture at room temperature
- A An example of a polarizing microscope photograph showing a polarizing microscope texture at room temperature, and (b) an example of a polarizing microscope photograph showing a polarizing microscope texture of a phase in a high temperature region adjacent to the crystal phase.
- A An example of a polarizing microscope photograph showing a polarizing microscope texture at room temperature, and (b) an example of a polarizing microscope photograph showing a polarizing microscope texture of a phase in a high temperature region adjacent to the crystal phase.
- A An example of a polarizing microscope photograph showing a polarizing microscope texture at room temperature, and (b) an example of a polarizing microscope photograph showing a polarizing microscope texture of a phase in a high temperature region adjacent to the crystal phase.
- FIG. 2A is an example of a polarization microscope photograph showing a polarization microscope texture at room temperature
- FIG. 2B is an example of a polarization microscope photograph showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase
- 2A is an example of a polarization microscope photograph showing a polarization microscope texture at room temperature
- FIG. 2B is an example of a polarization microscope photograph showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase.
- 2 is an example of a polarized light micrograph when the compound is cooled slowly from the isotropic phase
- (b) an example of a polarized light micrograph when it is rapidly cooled.
- FIG. 2A is an example of a polarizing microscope photograph showing a polarizing microscope texture at room temperature
- FIG. 2B is an example of a polarizing microscope photograph showing a polarizing microscope texture of a phase in a high temperature region adjacent to the crystal phase.
- A Example of a polarization microscope photograph showing a polarization microscope texture at room temperature
- FIG. 2A is an example of a polarization microscope photograph showing a polarizing microscope texture at room temperature
- FIG. 2B is an example of a polarization microscope photograph showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase
- 2A is an example of a polarization microscope photograph showing a polarization microscope texture at room temperature
- FIG. 2B is an example of a polarization microscope photograph showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase
- 2A is an example of a polarization microscope photograph showing a polarization microscope texture at room temperature
- 2B is an example of a polarization microscope photograph showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase.
- 2A is an example of a polarization microscope photograph showing a polarization microscope texture at room temperature
- FIG. 2B is an example of a polarization microscope photograph showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase.
- 2A is an example of a polarization microscope photograph showing a polarization microscope texture at room temperature
- FIG. 2B is an example of a polarization microscope photograph showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase.
- FIG. 2A is an example of a polarization microscope photograph showing a polarization microscope texture at room temperature
- FIG. 2B is an example of a polarization microscope photograph showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase
- 2A is an example of a polarization microscope photograph showing a polarization microscope texture at room temperature
- FIG. 2B is an example of a polarization microscope photograph showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase
- 2A is an example of a polarization microscope photograph showing a polarization microscope texture at room temperature
- 2B is an example of a polarization microscope photograph showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase.
- (A) an example of a polarization microscope photograph showing a polarization microscope texture at room temperature
- (b) an example of a polarization microscope photograph showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase.
- 2A is an example of a polarization microscope photograph showing a polarization microscope texture at room temperature
- FIG. 2B is an example of a polarization microscope photograph showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase.
- FIG. 2A is an example of a polarization microscope photograph showing a polarization microscope texture at room temperature
- FIG. 2B is an example of a polarization microscope photograph showing a polarization microscope texture of a phase in a high temperature region adjacent to the crystal phase.
- the FET manufactured in the example was subjected to thermal stress at a predetermined temperature (described on the horizontal axis) for 5 minutes, then returned to room temperature, the FET characteristics were measured, and the mobility (vertical axis) was plotted. It is a graph.
- the organic semiconductor material of the present invention has at least a charge transporting molecular unit A having an aromatic condensed ring structure; and a cyclic structure unit B connected to the unit by a single bond, and the unit A And an organic semiconductor material having an aliphatic side chain in at least one of the unit B.
- the organic semiconductor material of the present invention is characterized by exhibiting a liquid crystal phase other than the N phase, the SmA phase, and the SmC phase.
- the above “liquid crystal phase other than N phase, SmA phase, and SmC phase” is a liquid crystal phase selected from the group consisting of SmB, SmBcryst, SmI, SmF, SmE, SmJ, SmG, SmK, and SmH. It is preferable. This is because, when the liquid crystal material according to the present invention is used as an organic semiconductor in a liquid crystal phase, as described above, these liquid crystal phases have a low fluidity, so that it is difficult to induce ionic conduction, and the molecular alignment order is low. This is because high mobility can be expected in the liquid crystal phase.
- liquid crystal substance according to the present invention when used as an organic semiconductor in a crystal phase, these liquid crystal phases are less fluid than N phase, SmA phase, and SmC phase, so that the liquid crystal phase is increased by increasing the temperature. This is because the element is not easily destroyed even when it is transferred to.
- the liquid crystal phase appears only in the temperature lowering process, once crystallized, the crystal temperature region is widened, which is convenient for application in the crystal phase.
- the “phase other than the N phase, the SmA phase, and the SmC phase” is SmBcryst, SmE, SmF, SmI, SmJ, SmG, SmK, or SmH in the temperature lowering process.
- SmE and SmG which are higher-order Sm phases
- SmE and SmG are adjacent to the liquid crystal phase when the organic semiconductor material is heated from the crystal phase.
- a liquid crystal phase appearing in the temperature range Particularly preferred as a liquid crystal phase appearing in the temperature range.
- a liquid crystal substance in which a high-order liquid crystal phase appears in addition to a liquid-like low-order liquid crystal phase (N phase, SmA phase, or SmC phase) has high liquidity in the low-order liquid crystal phase. Since the molecular orientation is easier to control than the higher-order liquid crystal phase, the molecules are pre-aligned in the lower-order liquid crystal phase and then transferred to the higher-order liquid crystal phase. Since a liquid crystal thin film with few defects can be obtained, the quality of the liquid crystal thin film or the crystal thin film can be improved.
- the operating temperature required for a device using the liquid crystal material is usually -20 ° C to 80 ° C. Therefore, in the present invention, "phases other than N phase, SmA phase and SmC phase" appear. It is required that the temperature range to be ⁇ 20 ° C. or higher.
- the liquid crystal substance according to the present invention is used as an organic semiconductor in a crystal phase, it is effective to improve the quality by using a thin film in a liquid crystal state (liquid crystal thin film) as a precursor for producing a crystal thin film. For this reason, considering the simplicity of the process and the ease of selection of the substrate, the temperature at which the liquid crystal phase of the liquid crystal material appears is preferably 200 ° C. or lower.
- Suitable charge transporting molecular unit A In organic semiconductors, the molecular site involved in charge transport is a conjugated ⁇ -electron unit consisting of an aromatic ring. Generally, the larger the size of the conjugated ⁇ -electron system, the more advantageous for charge transport, but the size of the ⁇ -electron system. However, the solubility in an organic solvent decreases and the melting point becomes high, so that there is a problem that a process at the time of synthesis or use as an organic semiconductor becomes difficult. For this reason, the number of condensed rings of the charge transporting molecular unit is preferably 3 or more and 5 or less.
- the charge transporting molecular unit A may include a heterocycle. The number of carbon atoms in each ring constituting the condensed ring is preferably 5 to 6 (that is, a 5 to 6 membered ring) for the convenience of synthesis.
- the heterocycle constituting the charge transporting molecular unit A is also preferably a 5-membered to 6-membered ring.
- the number of heterocycles is not particularly limited, but is preferably the following numbers.
- the melting point can be used as a guide. This is because the melting point gives a measure of the cohesive energy of the compound.
- a compound having a high melting point means a strong interaction between molecules at the time of agglomeration, which corresponds to easy crystallization and is convenient for inducing the expression of a higher-order liquid crystal phase. Therefore, the melting point of the compound constituting the unit A (the compound constituted when there is no bond with the unit B and the unit C) is preferably 120 ° C.
- a melting point of 120 ° C. or lower is not preferable because a low-order liquid crystal phase tends to develop.
- the compound constituting the unit A will be specifically described below with examples.
- the target compound is (Chemical Formula 22)
- the compound constituting the unit A in question here excludes the single bond with the unit B, and is located at the position of the following unit A where the single bond was formed.
- the following compounds with hydrogen atoms replaced are obtained.
- the compound constituting the unit A is benzothieno [3,2-b] [1] benzothiophene, and the melting point of the benzothieno [3,2-b] [1] benzothiophene It is the melting point of the constituent compound.
- the number of repetitions of unit A may be 1 or 2.
- the unit B is an “another structure” part for providing a degree of freedom of flip-flop motion.
- the unit B is preferably an aromatic condensed ring connected to the charge transporting unit A by a single bond or an alicyclic molecular structure.
- the number of rings is preferably 1 or more and 5 or less (more preferably 3 or less, particularly 1 to 2).
- the number of rings of the unit B is not particularly limited, but when the number of rings constituting the unit A is “NA” and the number of rings constituting the unit A is “NB”, NA ⁇ NB may be satisfied. preferable. More specifically, the following numbers are preferable.
- Unit B may contain a heterocycle.
- the heterocycle is preferably a 5-membered to 6-membered ring.
- the unit B is preferably an aromatic compound, an aromatic condensed ring compound, a cycloalkane, a cycloalkene, an alicyclic saturated compound containing a hetero atom, or the like, which is exemplified below.
- cycloalkene cyclopentene, which is considered to have higher planarity than cyclohexene, is preferred.
- the unit C can be connected to the above unit A and / or unit B, for example. From the viewpoint of expanding the crystal temperature range when used as a crystal thin film, it is preferably connected to “one of” unit A or unit B described above.
- the unit C is preferably a hydrocarbon or a compound having a linear structure such as a saturated compound having a hetero atom, particularly preferably a hydrocarbon having 2 to 20 carbon atoms, or the general formula (1) (In the formula, X represents S, O, NH, m is an integer of 0 to 17, and n is an integer of 2 or more.) The group represented by these can be mentioned.
- the bonding position of the unit C will be described with reference to specific compounds used in the organic semiconductor material of the present invention.
- the unit A is benzothieno [3,2-b] [1].
- Benzothiophene unit B is a phenyl group
- unit C is C 10 H 21
- cyclic compound D to which unit C is bonded is benzene
- unit A benzothieno [3,2- b] [1] Shows that benzothiophene and unit C; C 10 H 21 are bonded.
- the binding position can be similarly shown for the compounds of the present invention having other units.
- the rotational movement around the axes of the two compounds is hindered due to their interaction if there are substituents or sterically large structures nearby. This results in fluctuations in the conformation and increases the reconstruction energy that affects the charge transfer rate between molecules. For this reason, a liquid crystal substance having such a molecular structure often has a reduced charge transport property even when a higher-order liquid crystal phase is developed.
- the number of repeating units A may be 1 or 2, but the entire structure of the compound may be repeated as shown in Chemical Formula 58, in which case 1 may be 1 or 2.
- the transfer integral of a ⁇ -electron molecular unit that is related to charge transport, called a core, is large as a factor governing the charge transfer rate in a liquid crystal phase or a crystal phase that is molecularly oriented. Is important. In order to actually calculate this value by the quantum chemical method, it is necessary to determine the specific molecular arrangement between adjacent molecules in the target molecular aggregation state and perform the calculation. For example, a molecular structure having an extended ⁇ -electron system with redundancy is advantageous against fluctuations relative to each other's relative molecular positions.
- a rod-like and somewhat large size ⁇ -electron conjugated system is selected as the charge transporting molecular unit consisting of a ⁇ -electron conjugated system serving as a charge transport site.
- a condensed ring is used instead of using a small aromatic ring, which is often employed as the structure of liquid crystal molecules, for example, benzene, thiophene, etc., connected by a single bond to form a large ⁇ -electron conjugated system.
- a molecular unit having a large ⁇ -electron conjugated system depending on the structure is used.
- the number of condensed rings is preferably 3 or more, but if the number of rings is too large, the solubility in a solvent is lowered, so 5 or less is realistic.
- benzone, pyridine, pyrimidine, thiopehene, thiazole, imidazole, and furane are aromatic ring structures, and these are condensed to form a rod-like three-ring structure, four-ring structure, and five-ring structure.
- the aromatic ⁇ -electron conjugated fused ring structure is preferable.
- a structure in which at least another rigid structure is connected to the above-mentioned aromatic ⁇ -electron conjugated condensed ring structure through a single bond is used as the main core structure constituting the liquid crystal molecule.
- a structure having the same or less number of rings as the aromatic ⁇ -electron conjugated condensed ring structure described above is selected, and may be 1 or 2.
- the structure is not limited to an aromatic ring in a broad sense including a heterocycle, but may be an alicyclic ring structure such as cyclohexane or cyclopentane, or cyclohexene or cyclopentene containing a double bond. good.
- a flexible hydrocarbon for imparting rod-like molecular shape anisotropy and liquidity to a rigid molecular unit called a core portion.
- the basic design of the rod-like liquid crystal material is to connect the units and to have a structure in which they are basically arranged in a straight line.
- the core portion corresponds to a structure in which at least another rigid structure is connected to the above-mentioned aromatic ⁇ -electron conjugated condensed ring structure through a single bond. It is important for the connecting position of the unit C in the core portion to give rod-like anisotropy as a whole molecule. In that case, the position of the unit C connected to the core part is either the unit A or the unit B as long as each unit is far from the single bond connecting the unit A and the unit B. You may connect to both. With regard to the molecular shape when the units C are connected, it should be noted that, generally, when the structure of the entire molecule has a large bend, the smectic phase is less likely to be induced.
- this molecular design can be given by the fluctuation width when the molecule of the core part is rotated around the single bond between the unit C and the core part. More specifically, the carbon atom to which the unit C is bonded is connected to the carbon or hetero element located on the outermost side of the core part of the unit A or unit B that is not directly bonded to the unit C when the molecule is rotated. If the angle between the straight line and the axis is ⁇ , and the blur width is described, this blur width ⁇ can increase the expression of the liquid crystal phase and the mobility, and is 90 ° or less, more preferably 60 °.
- the structure is preferably less than or equal to, more preferably less than or equal to 30 degrees.
- the angle formed by two single bonds is preferably 90 ° or more, more preferably 120 ° or more.
- a unit C structure containing a double bond or triple bond, or a hetero element such as oxygen, sulfur, or nitrogen can also be used.
- a hetero element such as oxygen, sulfur, or nitrogen
- a substance that exhibits a higher-order smectic liquid crystal phase and is useful as an organic semiconductor can be screened as necessary from among compounds satisfying the above-described molecular design.
- this screening basically, when used as an organic semiconductor in a liquid crystal phase, a higher order smectic phase is expressed, and when used as an organic semiconductor in a crystal phase, when cooled from a temperature higher than the crystal phase temperature, It is preferable to select one that does not develop a low-order liquid crystal phase adjacent to the crystal phase.
- This selection method can select a substance useful as an organic semiconductor material by making a determination according to a “screening method” described later.
- FIG. 1 shows a basic concept regarding the present invention.
- the structure shown in FIG. 1 is called a core part in liquid crystal molecules, and a unit C (preferably a unit having 3 or more carbon atoms) is provided on one side or both sides of the core part, and the molecular length of the core part.
- a unit C preferably a unit having 3 or more carbon atoms
- What is connected in the axial direction is the basic design of the molecule in the present invention.
- Scheme A shows a more detailed concept of the concept of FIG.
- the liquid crystal phase is stable in the substance in which the hydrocarbon chain is directly connected to the core part as in the examples of dialkylpentenecene and dialkylbenzothienobenzothiophene.
- the liquid crystal phase is not developed, or even if the liquid crystal phase is developed, only a low-order liquid crystal phase such as the SmA phase is developed (Liquid Liquid Crystal. Vol. 34. No. 9 (2007) 1001). -1007. Liquid Crystal.Vol.30.No.5 (2003) 603-610).
- a hydrocarbon chain is connected to the structure (core part) in which another rigid structural unit is connected to such a charge transporting molecular unit, thereby giving the molecule anisotropy and liquidity of a rod-like molecular shape. Therefore, the liquid crystal phase can be induced with a high probability.
- a liquid crystal phase can often be developed.
- the appearance temperature region of the liquid crystal phase is often asymmetric between the temperature lowering process and the temperature increasing process. This generally helps to extend the liquid crystal phase temperature region to a low temperature during the temperature lowering process, and conversely to expand the crystal phase to a high temperature region during the temperature rising process.
- This characteristic means that when a polycrystalline thin film of a liquid crystal material is used as an organic semiconductor, the liquid crystal thin film can be produced at a lower temperature when the polycrystalline thin film is produced using the liquid crystal thin film (thin liquid crystal phase thin film) as a precursor.
- the process becomes easier.
- the fact that the crystal phase temperature in the temperature rising process spreads to a high region means that the thermal stability of the produced polycrystalline film is improved, which is convenient as a material.
- the developed liquid crystal phase is generally stabilized, which is convenient for application to a device using the liquid crystal phase.
- the usefulness of the substance according to the present invention basically exhibits a higher-order smectic phase when used as an organic semiconductor in a liquid crystal phase.
- the usefulness of the substance according to the present invention when used as an organic semiconductor in the crystalline phase, it is difficult to form cracks or voids in the crystalline thin film when cooled from a temperature higher than the crystalline phase temperature, and a low-order liquid crystal phase is expressed adjacent to the crystalline phase. It is made use of by choosing what does not.
- a liquid crystal phase other than a nematic phase, SmA phase, or SmC phase is expressed in a temperature region adjacent to the crystal phase, or when used as an organic semiconductor in a crystal phase.
- the criterion is that cracks and voids are less likely to form when the crystal phase is cooled and transitioned to a crystal phase from a temperature range higher than the crystal phase.
- Screening method This can be easily determined by the screening method (determination method) described below. For details of each measurement method used in this screening method, the following documents can be referred to as necessary.
- test substance After the isolated test substance is purified by column chromatography and recrystallization, it is confirmed by thin layer chromatography on silica gel that the test substance shows a single spot (that is, not a mixture).
- the visual field changes instantaneously at the phase transition temperature, but the phase transition texture almost changes.
- the texture of the formed SmB phase, SmF phase, and SmI phase may be mistaken for the SmA phase and the SmC phase, so care should be taken.
- the energy levels of the HOMO and LUMO of the core part are also important.
- the HOMO level of an organic semiconductor is determined by dissolving a test substance in a dehydrated organic solvent such as dichloromethane to a concentration of, for example, 1 mmol / L to 10 mmol / L, and adding a supporting electrolyte such as a tetrabutylammonium salt.
- the HOMO level and LUMO level can be estimated from the difference between the peak potential and the reference potential, for example, a known substance such as ferrocene. If the HOMO level and LUMO level are outside the potential window of the organic solvent used, the HOMO-LUMO level is calculated from the absorption edge of the UV-visible absorption spectrum and subtracted from the measured level. Can be estimated. For this method, refer to J.mmerPommerehne, H. Vestweber, W. Guss, R. F. Mahrt, H. Bassler, M. Porsch, and J. Daub, Adv. Mater., 7, 551 (1995). be able to.
- the HOMO and LUMO levels of an organic semiconductor material provide a measure of electrical contact with the anode and cathode, respectively, and charge injection is limited by the size of the energy barrier determined by the difference from the work function of the electrode material. So be careful.
- the work function of a metal is often silver (Ag) 4.0 eV, aluminum (Al) 4.28 eV, gold (Au) 5.1 eV, calcium (Ca) 2.87 eV, as examples of materials used as electrodes.
- the work function difference between the organic semiconductor material and the electrode substance is preferably 1 eV or less, more preferably 0.8 eV or less. More preferably, it is 0.6 eV or less.
- the work function of the metal the following documents can be referred to as necessary. Document D: Handbook of Chemistry Fundamentals Revised 5th Edition II-608-610 14.1 b Work Function (Maruzen Publishing Co., Ltd.) (2004)
- the size of the conjugated system can be used as a reference when selecting materials.
- Examples of “charge transporting molecular unit A” that can be suitably used in the present invention are as follows.
- X represents S, O, NH.
- annular structure unit B An example of the “annular structure unit B” that can be suitably used in the present invention is as follows. Unit B may be the same as unit A.
- the “single bond” for connecting the units A and B which can be preferably used in the present invention, is a combination of carbons in the molecular major axis direction among the carbons constituting the cyclic structure of the units A and B. Choose so that the whole is a stick. That is, in the present invention, the carbon constituting the unit A and the carbon constituting the unit B are directly connected by a “single bond”.
- the unit C can be used in a linear form or a branched form, but a linear form is more preferable.
- the unit C preferably has 2 or more carbon atoms.
- the number of carbon atoms is further preferably 3-20.
- An increase in the number of carbons generally lowers the temperature of the liquid crystal phase, which is particularly convenient when used as an organic semiconductor in the liquid crystal phase.
- the solubility in an organic solvent is lowered, so that process suitability may be impaired.
- use of a structure containing oxygen, sulfur and nitrogen in unit C is effective in improving the solubility.
- unit A, unit B, and unit C that are particularly suitable for solving the problems of the present invention include the following.
- the compound of unit A mentioned above may have a known and commonly used substituent capable of substituting for unit A.
- substituents are not limited as long as they do not hinder the problems of the present invention, but preferred substituents include the following. Aliphatic compounds having hetero atoms such as alkyl groups, halogen atoms, oxygen atoms, nitrogen atoms, sulfur atoms, alkenyl groups, alkynyl groups, thiophene, thienothiophene, benzothiophene, benzene, naphthalene, biphenyl, fluorene as substituents, Aromatic compounds such as pyridine, imidazole, benzothiazole, furan
- the compound of unit B mentioned above may have a known and commonly used substituent.
- substituents are not limited as long as they do not hinder the problems of the present invention, but preferred substituents include the following.
- Aliphatic compounds having hetero atoms such as alkyl groups, halogen atoms, oxygen atoms, nitrogen atoms, sulfur atoms, alkenyl groups, alkynyl groups, thiophene, thienothiophene, benzothiophene, benzene, naphthalene, biphenyl, fluorene as substituents, Aromatic compounds such as pyridine, imidazole, benzothiazole, furan
- cyclopentene, cyclohexene, tetrahydrofuran, tetrahydropyran, tetrahydrothiophene, pyrrolidine, piperidine, and the like are particularly preferable because they can be expected to improve mobility by imparting planarity to the crystal structure of the compound.
- an amorphous organic semiconductor has a high mobility of about 10 ⁇ 2 cm 2 / Vs, and generally has a value of 10 ⁇ 5 to 10 ⁇ 3 cm 2 / Vs. Therefore, a high mobility exceeding 10 ⁇ 2 cm 2 / Vs exhibited by the liquid crystal phase,
- the mobility exceeding 0.1 cm 2 / Vs exhibited by a high-order smectic phase is difficult to realize with an amorphous organic semiconductor material, and the superiority of a liquid crystal material is clear.
- the liquid crystalline material exhibits a crystal phase like the non-liquid crystal material, it goes without saying that when the liquid crystal material is used as an organic semiconductor, it can be used not only in the liquid crystal phase but also in the crystal phase as an organic semiconductor.
- the mobility in the crystal phase is often about half to one digit higher than the mobility in the liquid crystal phase.
- transistor applications that require high mobility and large diffusion lengths of charges and excitons.
- the use of a crystalline phase is effective for the required application to solar cells and the like.
- Example 41 (Confirm semiconductor device operation)
- the experiment (measurement of transient photocurrent by Time-of-flight method) in Example 41 described later means observation of photocharge generation and charge transport by light irradiation, and this measurement system is an organic semiconductor. This corresponds to the realization of an optical sensor using materials. Therefore, it can be confirmed by this measurement that the organic semiconductor material of the present invention can be used for semiconductor device operation.
- the semiconductor device operation confirmation by such a method see, for example, the document Appl. Phys. Lett., 74 No. 18 2584-2586 (1999).
- Example 45 it is possible to confirm that the organic semiconductor material of the present invention can be used as an organic transistor by fabricating an FET and evaluating its characteristics.
- semiconductor device operation confirmation by such a method, see, for example, documents S. F. Nelsona, Y.-Y. Lin, D. J. Gundlach, and T. N. Jackson, Temperature-independent transport in high-mobility pentacene transistors, Appl. Phys.Lett., 72, No. 15 1854-1856 (1998) can be referred to.
- the basis of the molecular design according to the present invention is that at least another cyclic structure is connected to a condensed ring system connected in a rod shape of three or more aromatic rings within 5 rings via a single bond.
- This is a structure in which a hydrocarbon chain unit having 3 or more carbon atoms is connected in the molecular long axis direction to any one of the structures connected in the molecular long axis direction. This is illustrated by the examples with the following substances (see figure) as examples.
- the compound group used in the present invention can be molecularly designed by appropriately combining the above-mentioned units A to C.
- Specific examples of the compound group include the following, but from the present invention, However, the compound group to be used is not limited to these.
- pentathienoacene as unit A was synthesized by Jornal of American Chem. Soc. , 127 , 13281-13286, 2005, unit A can be monobrominated and then reacted by reacting with groups corresponding to units B and C described in Example 24. It is.
- Example 20 In order to synthesize compound 35, instead of dodecanoic acid chloride in Example 20, a compound obtained by treating the reaction product of 3-bromopropionic acid and dodecanol with thionyl chloride was used, and in place of phenylboronic acid. Using a reaction product of bromopyridine and bispinacolate diborane, the coupling reaction can be carried out in the same manner as in Example 20.
- dibenzo [d, d ′] thieno [3,2-b: 4,5-b] dithiophene as unit A was prepared in Advanced Mater. , 19 , 3008-3011, 2007, then brominating unit A, and using a compound obtained by treating nanodecanoic acid with thionyl chloride instead of dodecanoic acid chloride in Example 20, Furthermore, it can be adjusted by conducting a coupling reaction in the same manner as in Example 20 using a reaction product of bromopyridine and bispinacolate diborane instead of phenylboronic acid.
- carbazole as unit A was synthesized by the method described in Tetrahedron, 67, 8248-8254, 2011, unit A was monobrominated, unit B described in Example 24 and It can be adjusted by reacting with a group corresponding to C.
- chemical compounds 42 to 48 can be synthesized.
- the compounds represented by the chemical formulas 32 to 48 can be confirmed to be a compound group that solves the problems of the present invention by the method described in the literature shown in the screening method.
- Example 1 The starting material [1] [benzothieno [3,2-b] [1] benzothiophen-2-amine is Kosata, V.M. Kozmik and J.M. Svoboda, Collect. Czech. Chem. Commun. Vol. 67, 645 (2002). It was synthesized by the method described in 1.
- Chemical formula 10 was synthesized by the following method.
- This yellow solid substance (630 mg) was suspended in toluene (60 ml), and then iron powder (1.94 g, 34.8 mmol) was added.
- Embedded image embedded image 12 was synthesized based on the synthetic scheme of chemical formula 24 by the coupling reaction of chemical formula 24-5 and thienylstannane described below (Example 20).
- Argon gas was added to a toluene solution (2.5 mL) of Chemical Compound 24-5 (113 mg, 0.223 mmol), tributyl-2-thienylstannane (Tokyo Chemical Industry, 103 mg, 0.27 mmol) for 10 minutes. After bubbling, tetrakis (triphenylphosphine) palladium (13 mg, 0.011 mmol) was added and reacted at 95 ° C. for 18 hours.
- H-nmr 500 MHz, CDCl3: ⁇ 8.12 (d, 1H, J> 1 Hz, H-6), 7.84 (d, 1H, J 8.3 Hz, H-9), 7.78 (d , 1H, J 8.3Hz, H-4), 7.72 (br.s, 1H, H-1), 7.70 (dd, 1H, J 1.8, 8.3Hz, H-8), 7.40 (dd, 1H, J to 1, 3.7Hz, H-5 '(' denote thiophene)), 7.32 (dd, 1H, J to 1, 5Hz, H-3 '), 7.29 (Dd, 1H, J-1, ⁇ 8Hz, H-3), 7.12 (ddd, 1H, J 3.7, 5Hz, H-4 '), 2 76 (t, 2H, J ⁇ 7Hz, ArCH2), 1.70 (quint. 2H, J ⁇ 7Hz, ArCH2CH2)
- Chemical compound 13 was synthesized by the following method.
- Embedded image 14 was synthesized by the following method.
- Embedded image 15 was prepared by the same method as in Example 1, 2-iodo [1] [benzothieno [3,2-b] [1] benzothiophene (110 mg, 0.30 mmol) and 2- (4-propylphenyl) -4, 45 mg (yield: 42%) of the compound of formula 15 was obtained from 4,5,5-tetramethyl-1,3,2-dioxaborane (88 mg, 0.36 mol).
- Embedded image 16 was prepared by the same method as in Example 1, 2-iodo [1] [benzothieno [3,2-b] [1] benzothiophene (110 mg, 0.30 mmol) and 2- (4-butylphenyl) -4, 40 mg (yield: 36%) of the compound of formula 16 was obtained from 4,5,5-tetramethyl-1,3,2-dioxaborane (64 mg, 0.36 mol).
- Embedded image 17 was prepared by the same method as in Example 1, 2-iodo [1] [benzothieno [3,2-b] [1] benzothiophene (110 mg, 0.30 mmol) and 2- (4-pentylphenyl) -4, 90 mg (yield: 78%) of the compound of formula 17 was obtained from 4,5,5-tetramethyl-1,3,2-dioxaborane (100 mg, 0.36 mol).
- Embedded image 18 was prepared according to the same method as in Example 1, 2-iodo [1] [benzothieno [3,2-b] [1] benzothiophene (110 mg, 0.30 mmol) and 2- (4-hexylphenyl) -4, 50 mg (yield: 42%) of compound 18 was obtained from 4,5,5-tetramethyl-1,3,2-dioxaborane (100 mg, 0.36 mol).
- Embedded image 19 was prepared by the same method as in Example 1, 2-iodo [1] [benzothieno [3,2-b] [1] benzothiophene (110 mg, 0.30 mmol) and 2- (4-heptylphenyl) -4, 40 mg (yield: 32%) of the compound of the formula 19 was obtained from 4,5,5-tetramethyl-1,3,2-dioxaborane (110 mg, 0.36 mol).
- Embedded image 20 was prepared according to the same method as in Example 1, 2-iodo [1] [benzothieno [3,2-b] [1] benzothiophene (110 mg, 0.30 mmol) and 2- (4-octylphenyl) -4, 100 mg (yield: 78%) of the compound of the formula 20 was obtained from 4,5,5-tetramethyl-1,3,2-dioxaborane (84 mg, 0.36 mol).
- Embedded image was prepared by the same method as in Example 1 with 2-iod [1] [benzothieno [3,2-b] [1] benzothiophene (160 mg, 0.43 mmol) and 2- (4-nonylphenyl) -4. , 4,5,5-tetramethyl-1,3,2-dioxaborane (170 mg, 0.52 mol) gave 120 mg of the compound of formula 21 (yield: 66%).
- Embedded image embedded image 24 was synthesized from [1] benzothiono [3,2-b] [1] benzothiophene (abbreviated as BTBT) by the method described below according to the scheme shown below.
- compound numbers (4-1) to (4-5) have the meanings (24-1) to (24-5), respectively, and compound number (4) has the meaning (24). is there.
- Embedded image 25 was prepared according to the same method as in Example 1, 2-iodo [1] [benzothieno [3,2-b] [1] benzothiophene (130 mg, 0.35 mmol) and 2- (2-octyl-6-naphthyl). From -4,4,5,5-tetramethyl-1,3,2-dioxaborane (140 mg, 0.39 mol), 13 mg (yield: 8%) of the compound of formula 25 was obtained.
- Embedded image 26 was prepared by the same method as in Example 1, 2-iodo [1] [benzothieno [3,2-b] [1] benzothiophene (150 mg, 0.41 mmol) and 2- (4-octylbiphenyl) -4, 25 mg (yield: 12%) of Compound 26 was obtained from 4,5,5-tetramethyl-1,3,2-dioxaborane (190 mg, 0.49 mol).
- Chemical formula 27 was synthesized by the following method.
- Chemical compound 28 was synthesized by the following method.
- Chemical compound 29 was synthesized by the following method.
- Chem. 30 synthesized anthrac [2,3-b] thiophene-5,10 dione, then reduced it to give anthra [2,3-b] thiophene, and then 2-tributylstannyl- It was converted to anthra [2,3-b] thiophene, which was synthesized by coupling with 4-octyl-bromobenzene.
- Lithium aluminum hydride LiAlH 4 , 1.52 g, 0.040 mol
- anthra [2,3-b] thiophene-5,10 dione (2.64 g, 0.010 mol) was cooled to 0 ° C. was added and dried.
- THF 100 ml
- sales were expanded at 0 ° C. for about 1 hour.
- 0.76 g of LiAlH 4 was added, and sales were expanded at room temperature for 2 hours. While cooling to 0 ° C., 100 ml of 6M hydrochloric acid was added little by little. About 30 minutes at room temperature.
- Hnmr (500 MHz, CDC3): ⁇ 8.59 (s, 1H), 8.53 (s, 1H), 8.51 (s1H), 8.49 (s, 1H), 8.0 to 7.99 ( dd, 2H), 7.48-7.46 (d, 1H), 7.43-7.40 (dd, 2H), 7.40-7.39 (d, 1H)
- chemical 54 is cyclohexeneboronic acid pinacol ester (A, Aldrich)
- chemical 55 is cyclopenteneboronic acid pinacol ester (B, J. Org. Chem. 74, 7715, 2009) and 2-decyl-7.
- -It was synthesized under the same conditions by the Suzuki reaction of iodoBTBT.
- Acetic acid (0.5 mL) and 2,5-dimethyltetrahydrofuran (40 mg, 0.3 mmol) are added to a toluene solution (1 mL) of 7-decyl-BTBT-2-amine (40 mg, 0.1 mmol) at 95 ° C. Heated for 4 hours.
- a crude solid (42 mg) obtained by usual post-treatment with chloroform was purified with a silica gel column (cyclohexane) and recrystallized from ligroin to obtain 57, 15 mg (yield, 34%).
- Diboronic acid pinacol ester (C, new compound) was synthesized from D (J. Amer. Chem. Soc. 131, 13074, 2009) according to the method of Miyaura-Ishiyama.
- reaction solution was extracted with ethyl acetate, washed with water, and dried over magnesium sulfate.
- the ethyl acetate layer was concentrated and the residue was purified by column chromatography to obtain 59, 20 mg (yield: 13%).
- FIGS. 17 to 54 show the results of texture observation using a polarizing microscope for screening a suitable liquid crystal substance described in this specification.
- black lines or microscopic areas due to cracks or voids are observed, whereas in the phase appearing in the temperature region before crystallization, the black lines and areas are not observed.
- the texture was clearly not higher than the nematic phase characterized by the schlieren texture or the SmA phase or SmC phase characterized by the Fan-like texture.
- These substances were confirmed to be substances corresponding to the present invention from the viewpoint of this screening.
- Tables 9 to 15 show the phase transition behaviors related to the compounds listed in Tables 5 to 61 measured by a scanning differential thermal analyzer.
- I is an isotropic phase
- N is a nematic phase
- SmA is a smectic A phase
- SmE is a smectic E phase
- SmX is a higher order smectic phase or metastable crystal phase
- K is a crystal phase.
- a cell having a cell thickness of 13 to 17 ⁇ m (commercial product: manufactured by EHC), in which two glass substrates with ITO transparent electrodes are bonded with a thermosetting resin containing a spacer, is heated to the isotropic phase temperature of each compound.
- the sample was brought into contact with the opening of the cell, and the sample was injected into the cell using capillary action.
- the cell was fixed to a sample stage having a heater, and a DC voltage was applied to the electrode.
- a nitrogen pulse laser with a pulse width of 600 ps was irradiated, and the current flowing at that time was measured with a digital oscilloscope.
- the intensity of light irradiation is adjusted so that the integral value (charge amount) of the photocurrent flowing by light irradiation is within 10% of the geometric electric capacity of the cell so as not to cause waveform distortion due to space charge. Noted that.
- Example 42 As in Example 41, the transient photocurrent was measured at 200 ° C. showing the SmE phase by the time-of-flight method using the chemical formula 10 and the cell having a thickness of 13 ⁇ m, and the result is shown in FIG. A waveform was obtained. As apparent from this waveform, a shoulder corresponding to the transit time of holes was observed, and when the mobility of holes was estimated from this transit time, a high value of 0.2 cm 2 / Vs was obtained. It was found that the calculated mobility at the applied voltage does not depend on the electric field.
- the chemical 20 was similarly injected into a cell having a thickness of 16 ⁇ m, and the transient photocurrent by the time-of-flight method was measured at 170 ° C. corresponding to the SmE phase. As shown in FIG. 8, the waveform shows the running time, but shoulders were seen, and the running time could be determined. When the mobility was estimated from the value, a value of 0.1 cm 2 / Vs was obtained as the hole mobility.
- Example 41 using the chemical formula 28, as shown in FIG. 9, the transient photocurrent was measured at a high-order smectic phase (Smx phase) at 150 ° C., and the mobility was estimated. As the mobility, an extremely high value of 0.3 cm 2 / Vs was obtained. This hole mobility is the highest value among the conventionally known rod-like liquid crystal substances.
- Transient photocurrent measurement by the time-of-flight method is an effective method that can directly calculate mobility and confirm its usefulness as an organic semiconductor, but more empirically useful as an organic semiconductor material
- an FET was fabricated using the synthesized liquid crystal substance, and the characteristics were examined.
- the manufactured organic transistor has a structure shown in FIG. Specifically, an organic semiconductor layer was formed on a substrate, and then a source / drain electrode through a metal mask was vacuum deposited. The details are described below.
- Substrate> A heavily doped silicon wafer (P + -Si) was used as the gate electrode, and thermally oxidized silicon (SiO 2 thickness 300 nm) was used as the gate insulating film. After this thermal oxide film silicon wafer is cut into an appropriate size (20 ⁇ 25 mm), the cut silicon wafer (hereinafter abbreviated as “substrate”) is neutral detergent, ultrapure water, isopropyl alcohol (IPA), acetone, IPA In this order, ultrasonic cleaning was performed.
- substrate is neutral detergent, ultrapure water, isopropyl alcohol (IPA), acetone, IPA
- the liquid crystalline organic semiconductor compound was dissolved in an organic solvent (here, diethylbenzene) to prepare a solution.
- the concentration of the solution was 1 wt% to 0.5 wt%.
- This solution and a glass pipette for applying the solution to the substrate are heated in advance on a hot stage to a predetermined temperature, and the substrate is placed on a spin coater placed in an oven. Then, the solution was applied onto the substrate, and the substrate was rotated (about 3000 rpm, 30 seconds). After stopping the rotation, it was quickly taken out and cooled to room temperature. A liquid crystalline organic semiconductor film having a thickness of 30 to 50 nm was obtained.
- a gold electrode (30 to 100 nm) was deposited on the substrate coated with the organic semiconductor layer using a vacuum deposition method (2 ⁇ 10 ⁇ 6 Torr) to form a source / drain electrode.
- Table 16 shows the mobility estimated from typical transfer characteristics (shown in FIGS. 11 to 16) of the transistors manufactured using the compounds listed in the table.
- a transistor fabricated using didecylbenzothienobenzothiophene (10-BTBT-10) having a thermal resistance of 5 is subjected to thermal stress for 5 minutes at a predetermined temperature, and then subjected to thermal stress with mobility estimated from transistor characteristics at room temperature.
- the results plotted at the particular temperature are shown in FIG.
- a transistor made of compound 24 showing a high-order SmE phase in the temperature region adjacent to the crystal phase maintains high mobility even when heated at a temperature exceeding 150 ° C.
- Tables 17 and 18 show the SmE phase: hole mobility when the compounds listed in the table are used.
- the developed higher-order liquid crystal phase has a large aromatic ⁇ -electron condensed ring system that is advantageous for charge transport in the core portion, so that high mobility can be expected, uniform and defective It can be used as a high-quality organic semiconductor with little content.
- the transient photocurrent by the time-of-flight method described in the examples is the result of measuring the photocurrent of the substance to be measured, and this is an example of actual use as a photosensor. Further, as described in Examples, it has been proved that it can be used as an organic transistor material.
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Abstract
Description
本発明の有機半導体材料は、芳香族縮環系の構造を有する電荷輸送性分子ユニットAと;該ユニットと単結合で連結された、環状構造ユニットBとを少なくとも有し、且つ、前記ユニットAと、ユニットBとの少なくとも一方に、脂肪族系の側鎖を有する有機半導体材料である。本発明の有機半導体材料は、N相、SmA相およびSmC相以外の液晶相を示すことが特徴である。
更に、この「SmA相およびSmC相以外の液晶相」のうち、より高次のSm相であるSmE、SmGが、前記有機半導体材料を結晶相から昇温させた際に、液晶相に隣接した温度領域で現れる液晶相として特に好ましい。また、液体性の強い低次の液晶相(N相、SmA相やSmC相)に加えてそれ以外の高次の液晶相が出現する液晶物質では、低次の液晶相では液体性が強いため、分子配向の制御が高次の液晶相に比べて容易であるので、低次の液晶相で分子をあらかじめ配向させておき、高次の液晶相へ転移させることにより、分子配向の揺らぎや配向欠陥の少ない液晶薄膜を得ることができるので、液晶薄膜や結晶薄膜の高品質化が実現できる。
有機半導体においては電荷輸送にあずかる分子部位は芳香環などからなる共役したπ電子系ユニットで、一般には共役したπ電子系のサイズが大きいほど電荷輸送には有利であるが、π電子系のサイズが大きくなると、有機溶媒に対する溶解度が低下し、また、高融点となるため、合成時、あるいは、有機半導体として利用する際のプロセスが難しくなるという問題がある。このため、電荷輸送性分子ユニットの縮環数は3以上5以下であることが好ましい。電荷輸送性分子ユニットAは、ヘテロ環を含んでもよい。該縮環を構成する個々の環の炭素数は、合成の利便性から5~6個(すなわち、5員環~6員環)であることが好ましい。
3個 1個
4個 1~2個
5個 1~3個(特に1~2個)
高次の液晶相の発現を目指す観点からユニットAを構成する化合物を選択する場合、その融点を目安とすることができる。融点はその化合物の凝集エネルギーの目安を与えるからである。融点が高い化合物は凝集時の分子間の相互作用が強いことを意味し、結晶化しやすいことにも対応し、高次の液晶相の発現を誘起するのに都合がよい。したがって、ユニットAを構成する化合物(ユニットB及びユニットCとの結合がないとした場合に構成される化合物)の融点は、120℃以上であることが好ましく、より好ましくは150℃以上であり、更に好ましくは180℃以上、特に、好ましくは200℃以上である。融点が、120℃以下であると、低次の液晶相の発現が起こりやすく、好ましくない。
対象とする化合物が(化22)である場合、ここで問題とするユニットAを構成する化合物は、ユニットBとの単結合を排除し、当該単結合していた、以下のユニットAの位置に水素原子が置換された、下記の化合物となる。
本発明において、ユニットBは、フリップーフロップ運動の自由度を与えるための、「もう一つの構造」部である。ユニットBは、単結合で電荷輸送性ユニットAと連結された芳香族縮環、または、脂環式分子構造であることが好ましい。環数は1以上5以下(更には、3以下、特に1~2)であることが好ましい。
3個 1~3個、更には1~2個(特に、1個)
4個 1~4個、更には1~3個(特に、1~2個)
5個 1~5個、更には1~4個(特に、1~3個)
本発明において、上記のユニットAとユニットBとは直接単結合で連結する必要がある。
ユニットCは、例えば、上記のユニットAおよび/又はユニットBに連結することができる。結晶薄膜として用いる場合の結晶温度領域を広げるという点からは、上記のユニットAまたはユニットBの「いずれか一方」に連結していることが好ましい。好ましいユニットCとしては、炭化水素、或いはヘテロ原子を有する飽和化合物等の直線状構造を有する化合物が好ましく、特に好ましくは、炭素数2~20の炭化水素、又は一般式(1)
で表される基を挙げることができる。
二つの環状化合物を単結合で連結した場合、二つの化合物の軸周りの回転運動は、近くに置換基や立体的に大きな構造があるとその相互作用のために阻害され、分子の凝集時のコンフォメーションに揺らぎを与え、また、分子間の電荷移動速度に影響を与える再構築エネルギーを大きくする結果となる。このため、このような分子構造をもつ液晶物質は高次の液晶相が発現したとしても、電荷輸送特性が低下する場合が多い。
本発明においては、高い移動度を持つ液晶物質を実現するためには、次の点を考慮して分子設計を行うことが好ましい。
本発明において、上記の分子設計を満足する化合物中から、高次のスメクチック液晶相を発現し、有機半導体として有用な物質を、必要に応じてスクリーニングすることができる。このスクリーニングにおいて、基本的には、液晶相で有機半導体として用いる場合は高次のスメクチック相を発現すること、結晶相で有機半導体として用いる場合は、結晶相温度より高い温度から冷却したときに、結晶相に隣接して低次の液晶相を発現しないものを選ぶことが好ましい。この選択の方法は、後述する「スクリーニング法」にしたがって判定することにより、有機半導体材料として有用な物質を選択することが出来る。
液晶分子におけるコア部に対応する電荷輸送性分子ユニットとして、環数3以上の芳香族π-電子縮環系の分子ユニットを用いることにより、分子位置の揺らぎに対するtransfer積分の冗長性を確保でき、同様に、ベンゼンやチオフェンなどを複数、単結合で連結したπ-電子共役系の分子ユニットではなく、縮環構造を持つ分子ユニットを採用することにより、分子配座が固定されるため、transfer積分の増大が期待でき、移動度の向上に役立つ。
これは、以下に述べるスクリーニング法(判定法)によって、容易に判定することが出来る。このスクリーニング法に用いる各測定法の詳細に関しては、必要に応じて、下記の文献を参照することができる。
文献B:液晶材料の評価:実験化学講座第5版27巻P295~300、丸善
:液晶科学実験入門日本液晶学会編、シグマ出版
文献D:化学便覧 基礎編 改訂第5版II-608-610 14.1 b仕事関数 (丸善出版株式会社)(2004)
本発明において好適に使用可能な「電荷輸送性分子ユニットA」を例示すれば、以下の通りである。Xは、S、O、NHを表す。
本発明において好適に使用可能な、上記のユニットAおよびBを連結するための「単結合」は、ユニットAとユニットBの環状構造を構成する炭素のうち分子長軸方向にある炭素どうしを分子全体が棒状となる様に選ぶ。すなわち、本発明においては、ユニットAを構成する炭素と、ユニットBを構成する炭素とが、直接に「単結合」(single bond)で連結されている。
ユニットCは、直鎖状でも、分枝状でも使用可能であるが、直鎖状である方が、より好ましい。該ユニットCの炭素数は、2個以上であることが好ましい。この炭素数は、更には3~20個であることが好ましい。炭素数の増加は一般に液晶相温度を低下させることになるため、特に、液晶相で有機半導体として用いる場合は都合が良い。しかし、一方で、炭素数が長すぎると有機溶媒に対する溶解度を低下させることになるため、プロセス適性を損なう場合がある。炭素数を用いる場合、ユニットC中に酸素、硫黄、窒素を含む構造の用いると、溶解度の改善には有効である。その際、直接、酸素、硫黄、窒素原子がユニットA、または、ユニットBを連結されない構造が移動度の点からは好ましく、化学的安定性の点からは、ユニットA,または、ユニットBとの連結は2以上の炭素を介した後、酸素、硫黄、窒素が連結する構造が好ましい。上記例示の中で、本発明の課題を解決するのに特に好適なユニットA、ユニットB、ユニットCの具体例として、以下を挙げることができる。
アルキル基、ハロゲン原子、酸素原子、窒素原子、硫黄原子等のヘテロ原子を有する脂肪族化合物、アルケニル基、アルキニル基、置換基としてのチオフェン、チエノチオフェン、ベンゾチオフェン、ベンゼン、ナフタレン、ビフェニル、フルオレン、ピリジン、イミダゾール、ベンゾチアゾール、フラン等の芳香族化合物
チオフェン、チエノチオフェン、ベンゾチオフェン、ベンゼン、ナフタレン、ビフェニル、フルオレン、ピリジン、イミダゾール、ベンゾチアゾール、フラン、シクロペンテン、シクロヘキセン、テトラヒドロフラン、テトラヒドロピラン、テトラヒドロチオフェン、ピロリジン、ピペリジン
このような置換基は、本発明の課題を解決するのに支障がなければ、限定がないが、好ましい置換基としては、下記を挙げることができる。
後述する実施例41における実験(Time-of-flight法による過渡光電流の測定)により、本発明の有機半導体材料が、半導体としての動作に好適な移動度を有していることが確認可能である。このような方法による移動度の確認の詳細に関しては、例えば文献Appl.Phys.Lett., 71 No.5 602-604(1997)を参照することができる。
後述する実施例41における実験(Time-of-flight法による過渡光電流の測定)は、光照射による光電荷の発生と電荷輸送を観測することを意味しており、この測定系は、有機半導体材料を用いた光センサを実現していることに対応する。したがって、この測定により、本発明の有機半導体材料が、半導体デバイス動作に使用可能なことが確認可能である。このような方法による半導体デバイス動作確認の詳細に関しては、例えば文献Appl.Phys.Lett., 74 No.18 2584-2586(1999)を参照することができる。
本発明による分子設計に従い、本発明においては、基本的に、3環以上の5環以内の芳香環が棒状(すなわち、概ね直線状)に連結した縮環系に、単結合を介して、少なくとももう一つの環状構造を縮環系の分子長軸方向に連結させた構造のいずれか一方に、炭素数3以上の炭化水素鎖ユニットを分子長軸方向に連結させた構造であることが好ましい。
また、上記化32~化48の化合物においても前記スクリーニング法で示した文献記載の方法により、本発明の課題を解決する化合物群であることを確認することができる。
(b)相転移挙動(冷却過程)
*I:等方相、
N:ネマチック相、
SmA:スメクチックA相、
SmC:スメクチックC相、
SmE:スメクチックE相、
SmX:高次のスメクチック相もしくは準安定な結晶、
K:結晶相
原料の[1][ベンゾチエノ[3,2-b][1]ベンゾチオフェン-2-アミンはB.Kosata, V.Kozmik and J.Svoboda, Collect. Czech. Chem. Commun. Vol.67,645(2002).に記載の方法で合成した。
本実施例では、下記化49~52の化合物を上記実施例と同様の条件下に、2-decyl-7-iodoBTBTと、対応するボロン酸(夫々、p-メチルフェニルボロン酸、m-メチルフェニルボロン酸、o-メチルフェニルボロン酸、5-メチル-2-チオフェンボロン酸、何れも和光純薬工業製)との鈴木カップリング反応で合成した。
化53:2-デシル-7-パーフルオロフェニルBTBT ( FP-BTBT-10 )の合成
化54:2-シクロヘキセン-1-イル-7-デシルBTBT ( Che-BTBT-10 )
2-decyl-7-iodoBTBT(135mg、0.267mmol )、試薬B(103mg、0.53 mmol)のジオキサン(6 mL )溶液に2Mリン酸三カリウム( 0.27 mL )を加え20分アルゴンガスをバブリングした後、テトラキス(トリフェニルホスフィン)パラジウム( 15mg ),トリシクロヘキシルホスフィン( 7 mg )を加え、100℃で24時間反応した。反応液を冷却し生じた固体を濾取した。この固体(100mg)をクロロホルム溶液からシリカゲルに吸着させ、シリカゲルカラムにかけシクロヘキサン-クロロホルム(20 : 1 )で溶出し、濃縮し生じた固体を濾取した。この固体( 56mg )をリグロインから再結晶化し、化55, 54mg( 収率45%)を得た。
化56: 1-(7-デシルBTBT-2-)ピペリジン ( Pip-BTBT-10 )
2-decyl-7-iodoBTBT(51 mg, 0.1 mmol )、ピペリジン( 10 mg )のトルエン溶液(2 mL )にNaOtBu ( 13 mg ),Pd2( dba )3 ( ~4mg ), racBINAP ( ~4mg )を加え、95℃で40時間反応した。クロロホルムで常法の後処理後、粗製固体(46 mg )をシリカゲルカラム(シクロヘキサン-クロロホルム、2:1)続いて、アルミナカラム(シクロヘキサン-クロロホルム、4:1)で精製し、IPA-リグロインから再結晶化し、化56、9.2mg(収率、20%)を得た。
化57: 1-(7-デシルBTBT-2-)1Hピロール ( Pyr-BTBT-10 )
化58:7,7’-(テトラメチルビフェニル)-ビス(2-デシルBTBT) ( Me4BP( 10-BTBT)2)
化合物D(231 mg, 0.5 mmol )と化合物E( bis(pinacolato)diboron , 290 mg , 0.63 mmol )のDMSO(8mL)溶液に、PdCl2( dppf )-CH2Cl2 ( 43 mg ), 酢酸カリウム(300mg)を加え、アルゴンガスを10分間バブリングした後、90℃で21時間反応した。ジイソプロピルエーテルで抽出し(10mLx3)10%食塩水で洗浄、硫酸マグネシウムで乾燥し、濃縮乾固した。シリカゲルカラム(シクロヘキサン-酢酸エチル、19:1)で精製し、化合物C,206mg(収率、89%)を得た。
化合物C(69 mg, 0.15 mmol )、2-decyl-7-iodoBTBT(190mg、0.375 mmol )のジオキサン(7mL )溶液に2Mリン酸三カリウム(0.3mL )を加え10分間アルゴンガスをバブリングした後、テトラキス(トリフェニルホスフィン)パラジウム(14mg)、トリシクロヘキシルホスフィン(7mg)を加え、95℃で45時間反応した。クロロホルムで常法により後処理し、得られた粗製固体(200mg)をクロロホルム溶液からシリカゲルに吸着させ、シリカゲルカラムにかけ(シクロヘキサン――シクロヘキサン-クロロホルム、5:1)精製した。続いてクロロホルム-リグロインで再結晶化し、化58,36 mg(収率25%)を得た。
実施例41と同様に、化10を用いて、13μmの厚さのセルを用いてtime-of-flight法により、そのSmE相を示す200℃で過渡光電流を測定したところ、図7に示す波形が得られた。この波形から明らかなように、正孔の走行時間に対応した肩がみられ、この走行時間から正孔の移動度を見積もったところ、0.2cm2/Vsの高い値が得られた。印加電圧における算出された移動度は電場に依存しないことが分かった。
Claims (14)
- 芳香族縮環系の構造を有する電荷輸送性分子ユニットAと;該ユニットと単結合で連結された、環状構造ユニットBを少なくとも有し、且つ、前記ユニットAと、ユニットBとの少なくとも一方に、側鎖としてユニットCを有する有機半導体であって;
該材料が、N相、SmA相及びSmC相以外の相を示すことを特徴とする有機半導体材料。 - 前記「N相、SmA相及びSmC相以外の相」が、SmB、SmBcryst、SmI、SmF、SmG、SmE、SmJ、SmK、およびSmHからなる群から選ばれる液晶相である請求項1に記載の有機半導体材料。
- 前記有機半導体材料を結晶相から昇温させた際に、前記「N相、SmA相及びSmC相以外の相」が、結晶相に隣接して現れる請求項1または2に記載の有機半導体材料。
- 前記電荷輸送性分子ユニットAの縮環の数(NA)が3以上5以下である請求項1~3のいずれか1項に記載の有機半導体材料。
- 前記電荷輸送性分子ユニットAのそれぞれの縮環を構成する個々の環員数が、5又は6である請求項1~4のいずれか1項に記載の有機半導体材料。
- 前記環状構造ユニットBの数(NB)と、電荷輸送性分子ユニットAの縮環数の数(NA)が下記の関係を満たす請求項1~5のいずれか1項に記載の有機半導体材料。
NA≧NB - ユニットCとユニットAまたはユニットBとの単結合を軸として、ユニットAまたはユニットBを回転させた場合、
ユニットCが結合している炭素原子と、ユニットAまたはユニットBを回転させた場合のユニットCに直接結合していないユニットAまたはユニットBのコア部の最も外側にある炭素もしくはヘテロ元素を結んだ直線と、前記軸とのなす角θが80度以下である請求項1~7のいずれか1項に記載の有機半導体材料。 - 前記有機半導体材料が、降温過程において、「N相、SmA相及びSmC相以外の相」の出現に先立って、N相、SmA相及びSmC相の何れかの相が出現する請求項1~8のいずれか1項に記載の有機半導体材料。
- 前記有機半導体材料の降温過程において、「N相、SmA相及びSmC相以外の相」が、SmBcryst、SmE、SmF、SmI、SmJ、SmG、SmK、および/又はSmHである請求項1~9のいずれか1項に記載の有機半導体材料。
- 前記有機半導体材料の降温過程において、結晶相が出現する温度が200℃以下である請求項1~10のいずれか1項に記載の有機半導体材料。
- 前記有機半導体材料の昇温過程において、「N相、SmA相及びSmC相以外の相」が出現する温度領域が-20℃以上である請求項1~11のいずれか1項に記載の有機半導体材料。
- 請求項1~12のいずれか1項に記載の有機半導体材料を用いてなる有機半導体デバイス。
- 請求項1~12のいずれか1項に記載の有機半導体材料を有機半導体層として用いる有機トランジスタ。
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KR101819996B1 (ko) | 2018-01-18 |
JP2015053497A (ja) | 2015-03-19 |
EP2685514A1 (en) | 2014-01-15 |
KR101942441B1 (ko) | 2019-01-25 |
US10937964B2 (en) | 2021-03-02 |
US20140081028A1 (en) | 2014-03-20 |
CN103534830A (zh) | 2014-01-22 |
CN103534830B (zh) | 2017-03-01 |
EP2685514A4 (en) | 2014-09-24 |
EP3428987B1 (en) | 2020-02-26 |
KR20170132356A (ko) | 2017-12-01 |
JP6188663B2 (ja) | 2017-08-30 |
TW201243023A (en) | 2012-11-01 |
KR20140020268A (ko) | 2014-02-18 |
JP5632531B2 (ja) | 2014-11-26 |
TWI605105B (zh) | 2017-11-11 |
EP3428987A1 (en) | 2019-01-16 |
EP2685514B1 (en) | 2018-10-03 |
US10056557B2 (en) | 2018-08-21 |
US20180351106A1 (en) | 2018-12-06 |
KR20150127738A (ko) | 2015-11-17 |
JPWO2012121393A1 (ja) | 2014-07-17 |
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