US20100180944A1 - Polymers with low band gaps and high charge mobility - Google Patents
Polymers with low band gaps and high charge mobility Download PDFInfo
- Publication number
- US20100180944A1 US20100180944A1 US12/724,704 US72470410A US2010180944A1 US 20100180944 A1 US20100180944 A1 US 20100180944A1 US 72470410 A US72470410 A US 72470410A US 2010180944 A1 US2010180944 A1 US 2010180944A1
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- US
- United States
- Prior art keywords
- moiety
- alkoxy
- photovoltaic cell
- polymer
- aryl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 229920000642 polymer Polymers 0.000 title abstract description 70
- 239000000463 material Substances 0.000 claims description 67
- 125000003860 C1-C20 alkoxy group Chemical group 0.000 claims description 47
- 125000003118 aryl group Chemical group 0.000 claims description 41
- 125000001072 heteroaryl group Chemical group 0.000 claims description 37
- 239000000178 monomer Substances 0.000 claims description 37
- 125000003837 (C1-C20) alkyl group Chemical group 0.000 claims description 36
- 125000005843 halogen group Chemical group 0.000 claims description 24
- VJYJJHQEVLEOFL-UHFFFAOYSA-N thieno[3,2-b]thiophene Chemical group S1C=CC2=C1C=CS2 VJYJJHQEVLEOFL-UHFFFAOYSA-N 0.000 claims description 15
- 229910003472 fullerene Inorganic materials 0.000 claims description 14
- 125000001424 substituent group Chemical group 0.000 claims description 13
- XMWRBQBLMFGWIX-UHFFFAOYSA-N C60 fullerene Chemical compound C12=C3C(C4=C56)=C7C8=C5C5=C9C%10=C6C6=C4C1=C1C4=C6C6=C%10C%10=C9C9=C%11C5=C8C5=C8C7=C3C3=C7C2=C1C1=C2C4=C6C4=C%10C6=C9C9=C%11C5=C5C8=C3C3=C7C1=C1C2=C4C6=C2C9=C5C3=C12 XMWRBQBLMFGWIX-UHFFFAOYSA-N 0.000 claims description 11
- 229920001577 copolymer Polymers 0.000 claims description 11
- MCEWYIDBDVPMES-UHFFFAOYSA-N [60]pcbm Chemical compound C123C(C4=C5C6=C7C8=C9C%10=C%11C%12=C%13C%14=C%15C%16=C%17C%18=C(C=%19C=%20C%18=C%18C%16=C%13C%13=C%11C9=C9C7=C(C=%20C9=C%13%18)C(C7=%19)=C96)C6=C%11C%17=C%15C%13=C%15C%14=C%12C%12=C%10C%10=C85)=C9C7=C6C2=C%11C%13=C2C%15=C%12C%10=C4C23C1(CCCC(=O)OC)C1=CC=CC=C1 MCEWYIDBDVPMES-UHFFFAOYSA-N 0.000 claims description 10
- 125000001153 fluoro group Chemical group F* 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 36
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 33
- 0 C.C.[1*]C1([2*])C2=C(SC(C)=C2[3*])C2=C1C([4*])=C(C)S2 Chemical compound C.C.[1*]C1([2*])C2=C(SC(C)=C2[3*])C2=C1C([4*])=C(C)S2 0.000 description 31
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 22
- -1 ethylhexyl Chemical group 0.000 description 21
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical class CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 19
- 238000006243 chemical reaction Methods 0.000 description 17
- 239000000243 solution Substances 0.000 description 17
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 16
- 229910052757 nitrogen Inorganic materials 0.000 description 13
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical group C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 12
- HKNRNTYTYUWGLN-UHFFFAOYSA-N dithieno[3,2-a:2',3'-d]thiophene Chemical group C1=CSC2=C1SC1=C2C=CS1 HKNRNTYTYUWGLN-UHFFFAOYSA-N 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 125000003983 fluorenyl group Chemical group C1(=CC=CC=2C3=CC=CC=C3CC12)* 0.000 description 10
- 239000002904 solvent Substances 0.000 description 10
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 9
- 125000003545 alkoxy group Chemical group 0.000 description 9
- 150000003967 siloles Chemical group 0.000 description 9
- 239000000758 substrate Substances 0.000 description 9
- FNQJDLTXOVEEFB-UHFFFAOYSA-N 1,2,3-benzothiadiazole Chemical group C1=CC=C2SN=NC2=C1 FNQJDLTXOVEEFB-UHFFFAOYSA-N 0.000 description 8
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 8
- 125000004432 carbon atom Chemical group C* 0.000 description 8
- 238000004768 lowest unoccupied molecular orbital Methods 0.000 description 8
- 239000012044 organic layer Substances 0.000 description 8
- 239000011541 reaction mixture Substances 0.000 description 8
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 7
- FEOWHLLJXAECMU-UHFFFAOYSA-N 4,7-dibromo-2,1,3-benzothiadiazole Chemical compound BrC1=CC=C(Br)C2=NSN=C12 FEOWHLLJXAECMU-UHFFFAOYSA-N 0.000 description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 6
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 6
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- HEDRZPFGACZZDS-MICDWDOJSA-N Trichloro(2H)methane Chemical compound [2H]C(Cl)(Cl)Cl HEDRZPFGACZZDS-MICDWDOJSA-N 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000003960 organic solvent Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 6
- 238000003786 synthesis reaction Methods 0.000 description 6
- XREDBMQNKAWFGA-UHFFFAOYSA-N 2,3,3a,4-tetrahydro-1h-isoindole Chemical group C1=CCC2CNCC2=C1 XREDBMQNKAWFGA-UHFFFAOYSA-N 0.000 description 5
- 125000000753 cycloalkyl group Chemical group 0.000 description 5
- 125000000592 heterocycloalkyl group Chemical group 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 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 4
- CSNIZNHTOVFARY-UHFFFAOYSA-N 1,2-benzothiazole Chemical group C1=CC=C2C=NSC2=C1 CSNIZNHTOVFARY-UHFFFAOYSA-N 0.000 description 4
- RFFLAFLAYFXFSW-UHFFFAOYSA-N 1,2-dichlorobenzene Chemical compound ClC1=CC=CC=C1Cl RFFLAFLAYFXFSW-UHFFFAOYSA-N 0.000 description 4
- BZLVMXJERCGZMT-UHFFFAOYSA-N Methyl tert-butyl ether Chemical compound COC(C)(C)C BZLVMXJERCGZMT-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 125000000217 alkyl group Chemical group 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- IOJUPLGTWVMSFF-UHFFFAOYSA-N benzothiazole Chemical group C1=CC=C2SC=NC2=C1 IOJUPLGTWVMSFF-UHFFFAOYSA-N 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- DTDZVQXOCHUQLZ-UHFFFAOYSA-N thiadiazolo[5,4-f]quinoxaline Chemical group C1=CC2=NC=CN=C2C2=C1N=NS2 DTDZVQXOCHUQLZ-UHFFFAOYSA-N 0.000 description 4
- LWRYDHOHXNQTSK-UHFFFAOYSA-N thiophene oxide Chemical group O=S1C=CC=C1 LWRYDHOHXNQTSK-UHFFFAOYSA-N 0.000 description 4
- 239000004408 titanium dioxide Substances 0.000 description 4
- RIOQSEWOXXDEQQ-UHFFFAOYSA-N triphenylphosphine Chemical compound C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 RIOQSEWOXXDEQQ-UHFFFAOYSA-N 0.000 description 4
- 238000005160 1H NMR spectroscopy Methods 0.000 description 3
- UITASDKJJNYORO-UHFFFAOYSA-N 389-58-2 Chemical compound S1C=CC2=C1C(SC=C1)=C1C2 UITASDKJJNYORO-UHFFFAOYSA-N 0.000 description 3
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 3
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical class C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-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
- 230000000903 blocking effect Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- KTWOOEGAPBSYNW-UHFFFAOYSA-N ferrocene Chemical compound [Fe+2].C=1C=C[CH-]C=1.C=1C=C[CH-]C=1 KTWOOEGAPBSYNW-UHFFFAOYSA-N 0.000 description 3
- 230000005669 field effect Effects 0.000 description 3
- 238000004770 highest occupied molecular orbital Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000741 silica gel Substances 0.000 description 3
- 229910002027 silica gel Inorganic materials 0.000 description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 239000007858 starting material Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- UMHFSEWKWORSLP-UHFFFAOYSA-N thiophene 1,1-dioxide Chemical group O=S1(=O)C=CC=C1 UMHFSEWKWORSLP-UHFFFAOYSA-N 0.000 description 3
- 229940086542 triethylamine Drugs 0.000 description 3
- BMQDAIUNAGXSKR-UHFFFAOYSA-N (3-hydroxy-2,3-dimethylbutan-2-yl)oxyboronic acid Chemical compound CC(C)(O)C(C)(C)OB(O)O BMQDAIUNAGXSKR-UHFFFAOYSA-N 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- YNHIGQDRGKUECZ-UHFFFAOYSA-L PdCl2(PPh3)2 Substances [Cl-].[Cl-].[Pd+2].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 YNHIGQDRGKUECZ-UHFFFAOYSA-L 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000002800 charge carrier Substances 0.000 description 2
- KWTSZCJMWHGPOS-UHFFFAOYSA-M chloro(trimethyl)stannane Chemical compound C[Sn](C)(C)Cl KWTSZCJMWHGPOS-UHFFFAOYSA-M 0.000 description 2
- 238000004587 chromatography analysis Methods 0.000 description 2
- 239000012230 colorless oil Substances 0.000 description 2
- 238000006880 cross-coupling reaction Methods 0.000 description 2
- 239000003480 eluent Substances 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 125000005842 heteroatom Chemical group 0.000 description 2
- 238000004128 high performance liquid chromatography Methods 0.000 description 2
- 229920001519 homopolymer Polymers 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- HXITXNWTGFUOAU-UHFFFAOYSA-N phenylboronic acid Chemical compound OB(O)C1=CC=CC=C1 HXITXNWTGFUOAU-UHFFFAOYSA-N 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 235000009518 sodium iodide Nutrition 0.000 description 2
- 235000011152 sodium sulphate Nutrition 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 238000010345 tape casting Methods 0.000 description 2
- QHGNHLZPVBIIPX-UHFFFAOYSA-N tin(ii) oxide Chemical class [Sn]=O QHGNHLZPVBIIPX-UHFFFAOYSA-N 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- 150000003624 transition metals Chemical class 0.000 description 2
- MNDIARAMWBIKFW-UHFFFAOYSA-N 1-bromohexane Chemical compound CCCCCCBr MNDIARAMWBIKFW-UHFFFAOYSA-N 0.000 description 1
- PDQRQJVPEFGVRK-UHFFFAOYSA-N 2,1,3-benzothiadiazole Chemical group C1=CC=CC2=NSN=C21 PDQRQJVPEFGVRK-UHFFFAOYSA-N 0.000 description 1
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 description 1
- NZWIYPLSXWYKLH-UHFFFAOYSA-N 3-(bromomethyl)heptane Chemical compound CCCCC(CC)CBr NZWIYPLSXWYKLH-UHFFFAOYSA-N 0.000 description 1
- MRWWWZLJWNIEEJ-UHFFFAOYSA-N 4,4,5,5-tetramethyl-2-propan-2-yloxy-1,3,2-dioxaborolane Chemical compound CC(C)OB1OC(C)(C)C(C)(C)O1 MRWWWZLJWNIEEJ-UHFFFAOYSA-N 0.000 description 1
- NUCIQEWGTLOQTR-UHFFFAOYSA-N 4,4-bis(2-ethylhexyl)-4h-cyclopenta[1,2-b:5,4-b']dithiophene Chemical compound S1C=CC2=C1C(SC=C1)=C1C2(CC(CC)CCCC)CC(CC)CCCC NUCIQEWGTLOQTR-UHFFFAOYSA-N 0.000 description 1
- 125000004487 4-tetrahydropyranyl group Chemical group [H]C1([H])OC([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- ZJGNKNWCSXDBCB-UHFFFAOYSA-N BrC1=CC=C(Br)C2=NSN=C12.C1=CC=C(P(C2=CC=CC=C2)C2=CC=CC=C2)C=C1.CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC(C)=C2)C2=C1C=C(/C1=C/C=C(/C)C3=NSN=C31)S2.CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC([Sn](CCCC)(CCCC)CCCC)=C2)C2=C1C=C([Sn](CCCC)(CCCC)CCCC)S2 Chemical compound BrC1=CC=C(Br)C2=NSN=C12.C1=CC=C(P(C2=CC=CC=C2)C2=CC=CC=C2)C=C1.CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC(C)=C2)C2=C1C=C(/C1=C/C=C(/C)C3=NSN=C31)S2.CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC([Sn](CCCC)(CCCC)CCCC)=C2)C2=C1C=C([Sn](CCCC)(CCCC)CCCC)S2 ZJGNKNWCSXDBCB-UHFFFAOYSA-N 0.000 description 1
- DWYPCJCLWLAULI-UHFFFAOYSA-N BrC1=CC=C(Br)C2=NSN=C12.C1=CC=C(P(C2=CC=CC=C2)C2=CC=CC=C2)C=C1.CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC([Sn](C)(C)C)=C2)C2=C1C=C([Sn](C)(C)C)S2.CCCCCCC1(CCCCCC)C2=C(SC(/C3=C/C=C(/C)C4=NSN=C43)=C2)C2=C1C=C(/C1=C/C=C(/C3=CC4=C(S3)C3=C(C=C(C)S3)C4(CC(CC)CCCC)CC(CC)CCCC)C3=NSN=C31)S2.CCCCCCC1(CCCCCC)C2=C(SC([Sn](C)(C)C)=C2)C2=C1C=C([Sn](C)(C)C)S2 Chemical compound BrC1=CC=C(Br)C2=NSN=C12.C1=CC=C(P(C2=CC=CC=C2)C2=CC=CC=C2)C=C1.CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC([Sn](C)(C)C)=C2)C2=C1C=C([Sn](C)(C)C)S2.CCCCCCC1(CCCCCC)C2=C(SC(/C3=C/C=C(/C)C4=NSN=C43)=C2)C2=C1C=C(/C1=C/C=C(/C3=CC4=C(S3)C3=C(C=C(C)S3)C4(CC(CC)CCCC)CC(CC)CCCC)C3=NSN=C31)S2.CCCCCCC1(CCCCCC)C2=C(SC([Sn](C)(C)C)=C2)C2=C1C=C([Sn](C)(C)C)S2 DWYPCJCLWLAULI-UHFFFAOYSA-N 0.000 description 1
- UFKPRVIZRVYZDE-UHFFFAOYSA-N BrC1=CC=C(Br)C2=NSN=C12.C1=CC=C(P(C2=CC=CC=C2)C2=CC=CC=C2)C=C1.CCCCCCC1(CCCCCC)C2=C(SC(C)=C2)C2=C1C=C(/C1=C/C=C(/C)C3=NSN=C31)S2.CCCCCCC1(CCCCCC)C2=C(SC([Sn](CCCC)(CCCC)CCCC)=C2)C2=C1C=C([Sn](CCCC)(CCCC)CCCC)S2 Chemical compound BrC1=CC=C(Br)C2=NSN=C12.C1=CC=C(P(C2=CC=CC=C2)C2=CC=CC=C2)C=C1.CCCCCCC1(CCCCCC)C2=C(SC(C)=C2)C2=C1C=C(/C1=C/C=C(/C)C3=NSN=C31)S2.CCCCCCC1(CCCCCC)C2=C(SC([Sn](CCCC)(CCCC)CCCC)=C2)C2=C1C=C([Sn](CCCC)(CCCC)CCCC)S2 UFKPRVIZRVYZDE-UHFFFAOYSA-N 0.000 description 1
- SULRRYKTDRHVFU-UHFFFAOYSA-N C1=CC2=C(S1)C1=C(C=CS1)C2.CCCCCCC1(CCCCCC)C2=C(SC=C2)C2=C1C=CS2 Chemical compound C1=CC2=C(S1)C1=C(C=CS1)C2.CCCCCCC1(CCCCCC)C2=C(SC=C2)C2=C1C=CS2 SULRRYKTDRHVFU-UHFFFAOYSA-N 0.000 description 1
- QCRFXSUKMMYSEQ-UHFFFAOYSA-N CC(C)OB1OC(C)(C)C(C)(C)O1.CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC(B3OC(C)(C)C(C)(C)O3)=C2)C2=C1/C=C(/B1OC(C)(C)C(C)(C)O1)S2.CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC=C2)C2=C1/C=C\S2.[Li]CCCC Chemical compound CC(C)OB1OC(C)(C)C(C)(C)O1.CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC(B3OC(C)(C)C(C)(C)O3)=C2)C2=C1/C=C(/B1OC(C)(C)C(C)(C)O1)S2.CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC=C2)C2=C1/C=C\S2.[Li]CCCC QCRFXSUKMMYSEQ-UHFFFAOYSA-N 0.000 description 1
- XZXZPJABINCTRA-UHFFFAOYSA-N CC1=CC=C(C2=C(C3=CC=CC=C3)C(C3=CC=CC=C3)=C(C3=CC=C(C)S3)[Si]2(C)C)S1 Chemical compound CC1=CC=C(C2=C(C3=CC=CC=C3)C(C3=CC=CC=C3)=C(C3=CC=C(C)S3)[Si]2(C)C)S1 XZXZPJABINCTRA-UHFFFAOYSA-N 0.000 description 1
- ZZRXXNYXROQIOM-UHFFFAOYSA-N CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC(B3OC(C)(C)C(C)(C)O3)=C2)C2=C1/C=C(/B1OC(C)(C)C(C)(C)O1)S2.CCCCCCC1=C(C2=CC=C(C3=CC=C(Br)S3)S2)SC(C2=CC=C(C3=CC=C(Br)S3)S2)=C1CCCCCC.CCCCCCC1=C(C2=CC=C(C3=CC=C(C)S3)S2)SC(C2=CC=C(C3=CC=C(C4=CC5=C(S4)C4=C(/C=C(/C)S4)C5(CC(CC)CCCC)CC(CC)CCCC)S3)S2)=C1CCCCCC Chemical compound CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC(B3OC(C)(C)C(C)(C)O3)=C2)C2=C1/C=C(/B1OC(C)(C)C(C)(C)O1)S2.CCCCCCC1=C(C2=CC=C(C3=CC=C(Br)S3)S2)SC(C2=CC=C(C3=CC=C(Br)S3)S2)=C1CCCCCC.CCCCCCC1=C(C2=CC=C(C3=CC=C(C)S3)S2)SC(C2=CC=C(C3=CC=C(C4=CC5=C(S4)C4=C(/C=C(/C)S4)C5(CC(CC)CCCC)CC(CC)CCCC)S3)S2)=C1CCCCCC ZZRXXNYXROQIOM-UHFFFAOYSA-N 0.000 description 1
- GRCNQIQVFNSHPQ-UHFFFAOYSA-N CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC(C)=C2)C2=C1C=C(C1=CC=C(C)C3=NSN=C13)S2 Chemical compound CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC(C)=C2)C2=C1C=C(C1=CC=C(C)C3=NSN=C13)S2 GRCNQIQVFNSHPQ-UHFFFAOYSA-N 0.000 description 1
- CFVZLPYSVVWVCS-UHFFFAOYSA-N CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC(C)=C2)C2=C1C=C(C1=CC=C(C)C3=NSN=C13)S2.CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC(C)=C2)C2=C1C=C(C1=CC=C(C)S1(=O)=O)S2 Chemical compound CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC(C)=C2)C2=C1C=C(C1=CC=C(C)C3=NSN=C13)S2.CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC(C)=C2)C2=C1C=C(C1=CC=C(C)S1(=O)=O)S2 CFVZLPYSVVWVCS-UHFFFAOYSA-N 0.000 description 1
- SZGRNIMMFIWWJN-UHFFFAOYSA-N CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC(C)=C2)C2=C1C=C(C1=CC=C(C)S1(=O)=O)S2 Chemical compound CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC(C)=C2)C2=C1C=C(C1=CC=C(C)S1(=O)=O)S2 SZGRNIMMFIWWJN-UHFFFAOYSA-N 0.000 description 1
- MDRCPOGMOKEMFS-UHFFFAOYSA-N CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC([Sn](C)(C)C)=C2)C2=C1C=C([Sn](C)(C)C)S2.CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC=C2)C2=C1C=CS2 Chemical compound CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC([Sn](C)(C)C)=C2)C2=C1C=C([Sn](C)(C)C)S2.CCCCC(CC)CC1(CC(CC)CCCC)C2=C(SC=C2)C2=C1C=CS2 MDRCPOGMOKEMFS-UHFFFAOYSA-N 0.000 description 1
- AZFAEAHTFDGACF-UHFFFAOYSA-N CCCCCCC1(CCCCCC)C2=C(SC(C)=C2)C2=C1C=C(C1=CC=C(C)C3=NSN=C13)S2 Chemical compound CCCCCCC1(CCCCCC)C2=C(SC(C)=C2)C2=C1C=C(C1=CC=C(C)C3=NSN=C13)S2 AZFAEAHTFDGACF-UHFFFAOYSA-N 0.000 description 1
- VQNSDCJDVPVMOZ-UHFFFAOYSA-N CCCCCCC1(CCCCCC)C2=C(SC([Sn](C)(C)C)=C2)C2=C1C=C([Sn](C)(C)C)S2.CCCCCCC1(CCCCCC)C2=C(SC=C2)C2=C1C=CS2 Chemical compound CCCCCCC1(CCCCCC)C2=C(SC([Sn](C)(C)C)=C2)C2=C1C=C([Sn](C)(C)C)S2.CCCCCCC1(CCCCCC)C2=C(SC=C2)C2=C1C=CS2 VQNSDCJDVPVMOZ-UHFFFAOYSA-N 0.000 description 1
- HLQQGNYOCZKHPQ-UHFFFAOYSA-N CCCCCCC1(CCCCCC)C2=C(SC([Sn](CCCC)(CCCC)CCCC)=C2)C2=C1C=C([Sn](CCCC)(CCCC)CCCC)S2.CCCCCCC1(CCCCCC)C2=C(SC=C2)C2=C1C=CS2 Chemical compound CCCCCCC1(CCCCCC)C2=C(SC([Sn](CCCC)(CCCC)CCCC)=C2)C2=C1C=C([Sn](CCCC)(CCCC)CCCC)S2.CCCCCCC1(CCCCCC)C2=C(SC=C2)C2=C1C=CS2 HLQQGNYOCZKHPQ-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical group [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000007832 Na2SO4 Substances 0.000 description 1
- XOJVVFBFDXDTEG-UHFFFAOYSA-N Norphytane Natural products CC(C)CCCC(C)CCCC(C)CCCC(C)C XOJVVFBFDXDTEG-UHFFFAOYSA-N 0.000 description 1
- 235000019502 Orange oil Nutrition 0.000 description 1
- 229920000144 PEDOT:PSS Polymers 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- GCTFWCDSFPMHHS-UHFFFAOYSA-M Tributyltin chloride Chemical compound CCCC[Sn](Cl)(CCCC)CCCC GCTFWCDSFPMHHS-UHFFFAOYSA-M 0.000 description 1
- 125000002252 acyl group Chemical group 0.000 description 1
- 125000004423 acyloxy group Chemical group 0.000 description 1
- 125000003282 alkyl amino group Chemical group 0.000 description 1
- 125000004390 alkyl sulfonyl group Chemical group 0.000 description 1
- 125000004414 alkyl thio group Chemical group 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 125000005428 anthryl group Chemical group [H]C1=C([H])C([H])=C2C([H])=C3C(*)=C([H])C([H])=C([H])C3=C([H])C2=C1[H] 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 125000001769 aryl amino group Chemical group 0.000 description 1
- 125000004391 aryl sulfonyl group Chemical group 0.000 description 1
- 125000005110 aryl thio group Chemical group 0.000 description 1
- 125000004104 aryloxy group Chemical group 0.000 description 1
- 150000001642 boronic acid derivatives Chemical group 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 150000001733 carboxylic acid esters Chemical class 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000004440 column chromatography Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 125000004093 cyano group Chemical group *C#N 0.000 description 1
- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 description 1
- RJVPHPXQVBVPLV-UHFFFAOYSA-N cyclopenta[2,1-b:3,4-b']dithiophene Chemical compound S1C=CC2=CC3=CCSC3=C21 RJVPHPXQVBVPLV-UHFFFAOYSA-N 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000002059 diagnostic imaging Methods 0.000 description 1
- 125000004986 diarylamino group Chemical group 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000019439 ethyl acetate Nutrition 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 125000002541 furyl group Chemical group 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 125000005553 heteroaryloxy group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 125000002883 imidazolyl group Chemical group 0.000 description 1
- 125000001041 indolyl group Chemical group 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 125000005956 isoquinolyl group Chemical group 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- XKBGEWXEAPTVCK-UHFFFAOYSA-M methyltrioctylammonium chloride Chemical compound [Cl-].CCCCCCCC[N+](C)(CCCCCCCC)CCCCCCCC XKBGEWXEAPTVCK-UHFFFAOYSA-M 0.000 description 1
- RTOLOMCKXMZOIH-UHFFFAOYSA-N molport-035-677-613 Chemical compound S1C=CC2=C1C(SC=C1)=C1C2(CCCCCC)CCCCCC RTOLOMCKXMZOIH-UHFFFAOYSA-N 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 125000004957 naphthylene group Chemical group 0.000 description 1
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 235000019198 oils Nutrition 0.000 description 1
- 239000010502 orange oil Substances 0.000 description 1
- 125000002971 oxazolyl group Chemical group 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 125000005561 phenanthryl group Chemical group 0.000 description 1
- 125000000843 phenylene group Chemical group C1(=C(C=CC=C1)*)* 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 125000001725 pyrenyl group Chemical group 0.000 description 1
- 125000004076 pyridyl group Chemical group 0.000 description 1
- 125000000714 pyrimidinyl group Chemical group 0.000 description 1
- 125000000168 pyrrolyl group Chemical group 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 125000002294 quinazolinyl group Chemical group N1=C(N=CC2=CC=CC=C12)* 0.000 description 1
- 125000005493 quinolyl group Chemical group 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- WWGXHTXOZKVJDN-UHFFFAOYSA-M sodium;n,n-diethylcarbamodithioate;trihydrate Chemical compound O.O.O.[Na+].CCN(CC)C([S-])=S WWGXHTXOZKVJDN-UHFFFAOYSA-M 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 125000000446 sulfanediyl group Chemical group *S* 0.000 description 1
- 239000003115 supporting electrolyte Substances 0.000 description 1
- 238000002207 thermal evaporation Methods 0.000 description 1
- 125000000335 thiazolyl group Chemical group 0.000 description 1
- 125000001544 thienyl group Chemical group 0.000 description 1
- 229930192474 thiophene Natural products 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- CCRMAATUKBYMPA-UHFFFAOYSA-N trimethyltin Chemical compound C[Sn](C)C.C[Sn](C)C CCRMAATUKBYMPA-UHFFFAOYSA-N 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 235000014692 zinc oxide Nutrition 0.000 description 1
- RNWHGQJWIACOKP-UHFFFAOYSA-N zinc;oxygen(2-) Chemical class [O-2].[Zn+2] RNWHGQJWIACOKP-UHFFFAOYSA-N 0.000 description 1
Images
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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
- H10K85/10—Organic polymers or oligomers
- H10K85/151—Copolymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G61/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G61/12—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule
- C08G61/122—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides
- C08G61/123—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides derived from five-membered heterocyclic compounds
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- C—CHEMISTRY; METALLURGY
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G61/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G61/12—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule
- C08G61/122—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides
- C08G61/123—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides derived from five-membered heterocyclic compounds
- C08G61/124—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides derived from five-membered heterocyclic compounds with a five-membered ring containing one nitrogen atom in the ring
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- C—CHEMISTRY; METALLURGY
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G61/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G61/12—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule
- C08G61/122—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides
- C08G61/123—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides derived from five-membered heterocyclic compounds
- C08G61/126—Macromolecular compounds containing atoms other than carbon in the main chain of the macromolecule derived from five- or six-membered heterocyclic compounds, other than imides derived from five-membered heterocyclic compounds with a five-membered ring containing one sulfur atom in the ring
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- H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
- H10K85/10—Organic polymers or oligomers
- H10K85/111—Organic polymers or oligomers comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
- H10K85/113—Heteroaromatic compounds comprising sulfur or selene, e.g. polythiophene
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- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
Definitions
- the first monomer or comonomer repeat unit can include a cyclopentadithiophene moiety of formula (I):
- At least one of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , and R 8 can be C 1 -C 20 alkoxy optionally further substituted with C 1 -C 20 alkoxy or halo (e.g., (OCH 2 CH 2 ) 2 OCH 3 or OCH 2 CF 2 OCF 2 CF 2 OCF 3 ).
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- Polyoxymethylene Polymers And Polymers With Carbon-To-Carbon Bonds (AREA)
- Photovoltaic Devices (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
- Light Receiving Elements (AREA)
- Formation Of Insulating Films (AREA)
Abstract
Description
- This application is a continuation of U.S. Utility application Ser. No. 11/485,708, filed Jul. 13, 2006, which in turn is a continuation-in-part of U.S. Utility application Ser. No. 11/450,521, filed Jun. 9, 2006, which in turn is a continuation-in-part of U.S. Utility application Ser. No. 11/375,643, filed Mar. 14, 2006, which claims priority to U.S. Provisional Application Ser. No. 60/699,123, filed Jul. 14, 2005. The contents of all parent applications are hereby incorporated by reference.
- This disclosure generally relates to the field of electron donor materials, as well as related photovoltaic cells.
- Photovoltaic cells are commonly used to transfer energy in the form of light into energy in the form of electricity. A typical photovoltaic cell includes a photoactive material disposed between two electrodes. Generally, light passes through one or both of the electrodes to interact with the photoactive material. As a result, the ability of one or both of the electrodes to transmit light (e.g., light at one or more wavelengths absorbed by a photoactive material) can limit the overall efficiency of a photovoltaic cell. In many photovoltaic cells, a film of semiconductive material (e.g., indium tin oxide) is used to form the electrode(s) through which light passes because, although the semiconductive material can have a lower electrical conductivity than electrically conductive materials, the semiconductive material can transmit more light than many electrically conductive materials.
- An aspect of the invention relates to a new combination of monomers that produce polymers, wherein the polymers have properties suitable for use as charge carriers in the active layer of a photovoltaic cell.
- In one aspect, the invention features a class of co-polymers including at least two co-monomers, at least one of which is a cyclopentadithiophene.
- In another aspect, this invention features a photovoltaic cell including a first electrode, a second electrode, and a photoactive material disposed between the first and second electrodes. The photoactive material includes a polymer having a first comonomer repeat unit and a second comonomer repeat unit. The first comonomer repeat unit includes a cyclopentadithiophene moiety. The second comonomer repeat unit includes a silole moiety, a thienothiophene moiety, a thienothiophene oxide moiety, a dithienothiophene moiety, a dithienothiophene oxide moiety, or a tetrahydroisoindole moiety.
- In another aspect, this invention features a photovoltaic cell including a first electrode, a second electrode, and a photoactive material disposed between the first and second electrodes. The photoactive material includes a polymer having a first comonomer repeat unit and a second comonomer repeat unit different from the first comonomer repeat unit. The first comonomer repeat unit includes a cyclopentadithiophene moiety.
- In another aspect, this invention features a polymer that includes a first comonomer repeat unit containing a cyclopentadithiophene moiety, and a second comonomer repeat unit containing a benzothiadiazole moiety, a thiadiazoloquinoxaline moiety, a cyclopentadithiophene oxide moiety, a benzoisothiazole moiety, a benzothiazole moiety, a thiophene oxide moiety, a fluorene moiety, a thiophene moiety, a silole moiety, a thienothiophene moiety, a thienothiophene oxide moiety, a dithienothiophene moiety, a dithienothiophene oxide moiety, a tetrahydroisoindole moiety, or a moiety containing at least three thiophene moieties.
- In another aspect, this invention features a polymer that includes a first comonomer repeat unit and a second comonomer repeat unit different from the first comonomer repeat unit. The first comonomer repeat unit contains a cyclopentadithiophene moiety substituted with at least one substituent selected from the group consisting of hexyl, ethylhexyl, dimethyloctyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, and C3-C20 heterocycloalkyl.
- In another aspect, this invention features a device (e.g., a photovoltaic cell) that includes a first electrode, a second electrode, and a photoactive material disposed between the first and second electrodes. The photoactive material includes a polymer having a first monomer repeat unit, which includes a benzothiadiazole moiety, a thiophene oxide moiety, a cyclopentadithiophene oxide moiety, a thiadiazoloquinoxaline moiety, a benzoisothiazole moiety, a benzothiazole moiety, a thienothiophene moiety, a thienothiophene oxide moiety, a dithienothiophene moiety, a dithienothiophene oxide moiety, a tetrahydroisoindole moiety, a fluorene moiety, a thiophene moiety, a silole moiety, or a fluorene moiety.
- In another aspect, this invention features a device (e.g., a photovoltaic cell) that includes a first electrode, a second electrode, and a photoactive material disposed between the first and second electrodes. The photoactive material includes a polymer having a first monomer repeat unit, which includes a cyclopentadithiophene moiety substituted with at least one substituent selected from the group consisting of hexyl, ethylhexyl, dimethyloctyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, C3-C20 heterocycloalkyl halo, CN, NO2, or SO2R, in which R is C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl.
- Embodiments can include one or more of the following features.
- In some embodiments, the cyclopentadithiophene moiety is substituted with at least one substituent selected from the group consisting of C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, C3-C20 heterocycloalkyl, halo, CN, NO2, and SO2R, in which R is H, C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl. Examples of C1-C20 alkyl can be hexyl, 2-ethylhexyl, or 3,7-dimethyloctyl.
- In some embodiments, the cyclopentadithiophene moiety can be substituted at 4-position.
- In some embodiments, the first monomer or comonomer repeat unit can include a cyclopentadithiophene moiety of formula (I):
- In formula (I), each of R1, R2, R3, and R4, independently, is H, C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, C3-C20 heterocycloalkyl, halo, CN, NO2, or SO2R, in which R is H, C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl. In some embodiments, at least one of R1 and R2, independently, is hexyl, 2-ethylhexyl, or 3,7-dimethyloctyl. In certain embodiments, each of R1 and R2, independently, is hexyl, 2-ethylhexyl, or 3,7-dimethyloctyl. In some embodiments, one of R1 and R2 is hexyl, ethylhexyl, dimethyloctyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl, the other of R1 and R2 is H, C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl. In some embodiments, at least one of R1 and R2, independently, is C1-C20 alkoxy optionally further substituted with C1-C20 alkoxy or halo (e.g., (OCH2CH2)2OCH3 or OCH2CF2OCF2CF2OCF3). In certain embodiments, each of R1 and R2, independently, is C1-C20 alkoxy optionally further substituted with C1-C20 alkoxy or halo.
- In some embodiments, the second comonomer repeat unit can include a benzothiadiazole moiety, a thiadiazoloquinoxaline moiety, a cyclopentadithiophene oxide moiety, a benzoisothiazole moiety, a benzothiazole moiety, a thiophene oxide moiety, a thienothiophene moiety, a thienothiophene oxide moiety, a dithienothiophene moiety, a dithienothiophene oxide moiety, a tetrahydroisoindole moiety, a fluorene moiety, a thiophene moiety, or a silole moiety, each of which is optionally substituted with at least one substituent selected from the group consisting of C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, C3-C20 heterocycloalkyl, halo, CN, NO2, and SO2R, in which R is H, C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl. In some embodiments, the second comonomer repeat unit can include a 3,4-benzo-1,2,5-thiadiazole moiety.
- In some embodiments, the second comonomer repeat unit can include a benzothiadiazole moiety of formula (II), a thiadiazoloquinoxaline moiety of formula (III), a cyclopentadithiophene dioxide moiety of formula (IV), a cyclopentadithiophene monoxide moiety of formula (V), a benzoisothiazole moiety of formula (VI), a benzothiazole moiety of formula (VII), a thiophene dioxide moiety of formula (VIII), a cyclopentadithiophene dioxide moiety of formula (IX), or a cyclopentadithiophene tetraoxide moiety of formula (X):
- in which each of R5, R6, and R7, independently, is H, C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, C3-C20 heterocycloalkyl, halo, CN, NO2, and SO2R, in which R is H, C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl. In some embodiments, the second comonomer repeat unit can include a benzothiadiazole moiety of formula (II). In certain embodiments, R5 and R6 is H.
- In some embodiments, the second comonomer repeat unit can include at least three thiophene moieties. In some embodiments, at least one of the thiophene moieties is substituted with at least one substituent selected from the group consisting of C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, C3-C20 heterocycloalkyl, halo, CN, NO2, and SO2R, in which R is H, C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl. In certain embodiments, the second comonomer repeat unit includes five thiophene moieties.
- In some embodiments, the second comonomer repeat unit can include a thienothiophene moiety of formula (XI), a thienothiophene tetraoxide moiety of formula (XII), a dithienothiophene moiety of formula (XIII), a dithienothiophene dioxide moiety of formula (XIV), a dithienothiophene tetraoxide moiety of formula (XV), a tetrahydroisoindole moiety of formula (XVI), a thienothiophene dioxide moiety of formula (XVII), or a dithienothiophene dioxide moiety of formula (XVIII):
- in which each of X and Y, independently, is CH2, O, or S; each of R5 and R6, independently, is H, C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, C3-C20 heterocycloalkyl, halo, CN, NO2, or SO2R, in which R is C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl; and R7 is H, C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl.
- In some embodiments, the polymer can further include a third comonomer repeat unit that contains a thiophene moiety or a fluorene moiety. In some embodiments, the thiophene or fluorene moiety is substituted with at least one substituent selected from the group consisting of C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, and C3-C20 heterocycloalkyl, halo, CN, NO2, and SO2R, in which R is H, C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl.
- In some embodiments, the first monomer or comonomer repeat unit can include a benzothiadiazole moiety of formula (II), a thiophene dioxide moiety of formula (VIII), a cyclopentadithiophene tetraoxide moiety of formula (X), or a fluorene moiety of formula (XIX):
- in which each of R5 and R6, independently, is H, C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, C3-C20 heterocycloalkyl, halo, CN, NO2, or SO2R. R can be C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl. In some embodiments, at least one of R5 and R6 can be C1-C20 alkoxy optionally further substituted with C1-C20 alkoxy or halo (e.g., (OCH2CH2)2OCH3 or OCH2CF2OCF2CF2OCF3).
- In some embodiments, the polymer can include a second monomer repeat unit different from the first monomer repeat unit. The second monomer repeat unit can include a cyclopentadithiophene moiety, a benzothiadiazole moiety, a thiophene oxide moiety, a cyclopentadithiophene oxide moiety, a fluorene moiety, or a thiophene moiety.
- In some embodiments, the first or second monomer repeat unit can include at least one substituent on a ring selected from the group consisting of C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, C3-C20 heterocycloalkyl, halo, CN, NO2, and SO2R, in which R is H, C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl. The substituent can be hexyl, ethylhexyl, or C1-C20 alkoxy optionally further substituted with C1-C20 alkoxy or halo (e.g., (OCH2CH2)2OCH3 or OCH2CF2OCF2CF2OCF3).
- In some embodiments, the second monomer repeat unit can include a cyclopentadithiophene moiety of formula (I), a benzothiadiazole moiety of formula (II), a thiophene dioxide moiety of formula (VIII), a cyclopentadithiophene tetraoxide moiety of formula (X), a fluorene moiety of formula (XIX), a thiophene moiety of formula (XX), or a silole moiety of formula (XXI):
- in which each of R1, R2, R3, R4, R5, R6, R7, and R8, independently, is H, C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, C3-C20 heterocycloalkyl, halo, CN, NO2, or SO2R. R can be C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl. In some embodiments, at least one of R1, R2, R3, R4, R5, R6, R7, and R8, can be C1-C20 alkoxy optionally further substituted with C1-C20 alkoxy or halo (e.g., (OCH2CH2)2OCH3 or OCH2CF2OCF2CF2OCF3).
- In some embodiments, when the second comonomer contains a silole moiety of formula (XXI), at least one of R5, R6, R7 and R8 can be C1-C20 alkyl optionally substituted with halo, or aryl optionally substituted with C1-C20 alkyl. In certain embodiments, each of R5 and R6, independently can be aryl optionally substituted with C1-C20 alkyl, and each of R7 and R8, independently, can be C1-C20 alkyl optionally substituted with halo. An example of a silole moiety is
- In some embodiments, the polymer can be an electron donor material or an electron acceptor material.
- In some embodiments, the polymer can be
- in which n can be an integer greater than 1.
- In some embodiments, the photovoltaic cell can be a tandem photovoltaic cell.
- In some embodiments, the photoactive material can include an electron acceptor material. In some embodiments, the electron acceptor material can be a fullerene (e.g., C61-phenyl-butyric acid methyl ester, PCBM).
- In some embodiments, the polymer and the electron acceptor material each can have a LUMO energy level. The LUMO energy level of the polymer can be at least about 0.2 eV (e.g., at least about 0.3 eV) less negative than the LUMO energy level of the electron acceptor material.
- In some embodiments, the device can be an organic semiconductive device. In certain embodiments, the device can be a member selected from the group consisting of field effect transistors, photodetectors, photovoltaic detectors, imaging devices, light emitting diodes, lasing devices, conversion layers, amplifiers and emitters, storage elements, and electrochromic devices.
- Embodiments can provide one or more of the following advantages.
- In some embodiments, using a polymer containing a cyclopentadithiophene moiety can be advantageous because the cyclopentadithiophene moiety can contribute to a shift in the maximum absorption wavelength toward the red or near IR region of the electromagnetic spectrum. When such a polymer is incorporated into a photovoltaic cell, the current and efficiency of the cell can increase.
- In some embodiments, substituted fullerenes or polymers containing substituted monomer repeat units (e.g., substituted with long-chain alkoxy groups such as oligomeric ethylene oxides or fluorinated alkoxy groups) can have improved solubility in organic solvents and can form an photoactive layer with improved morphology.
- In some embodiments, a polymer containing a silole moiety can absorb light at a relatively long wavelength and have improved solubility in organic solvents. In some embodiments, a polymer containing a silole moiety can be used to prepare an electron donor material with improved semiconductive properties.
- In some embodiments, a polymer fullerene cell containing a polymer described above can have a band gap that is relatively ideal for its intended purposes.
- In some embodiments, a photovoltaic cell having high cell voltage can be created, whereby the HOMO level of the polymer is at least about 0.2 electron volts more negative relative to the LUMO or conduction band of an electron acceptor material.
- In some embodiments, a photovoltaic cell containing a polymer described above can have relatively fast and efficient transfer of an electron to an electron acceptor material, whereby the LUMO of the donor is at least about 0.2 electron volt (e.g., at least about 0.3 electron volt) less negative than the conduction band of the electron acceptor material.
- In some embodiments, a photovoltaic cell containing a polymer described above can have relatively fast charge separation, whereby the charge mobility of the positive charge, or hole, is relatively high and falls within the range of 10−4 to 10−1 cm2/Vs.
- In some embodiments, the polymer is soluble in an organic solvent and/or film forming.
- In some embodiments, the polymer is optically non-scattering.
- In some embodiments, the polymer can be used in organic field effect transistors and OLEDs.
- Other features and advantages of the invention will be apparent from the description, drawings, and claims.
-
FIG. 1 is a cross-sectional view of an embodiment of a photovoltaic cell. -
FIG. 2 is a schematic of a system containing one electrode between two photoactive layers. - Like reference symbols in the various drawings indicate like elements.
-
FIG. 1 shows a cross-sectional view of aphotovoltaic cell 100 that includes asubstrate 110, acathode 120, ahole carrier layer 130, an active layer 140 (containing an electron acceptor material and an electron donor material), ahole blocking layer 150, ananode 160, and asubstrate 170. - In general, during use, light impinges on the surface of
substrate 110, and passes throughsubstrate 110,cathode 120, andhole carrier layer 130. The light then interacts withactive layer 140, causing electrons to be transferred from the electron donor material (e.g., a polymer described above) to the electron acceptor material (e.g., PCBM). The electron acceptor material then transmits the electrons throughhole blocking layer 150 toanode 160, and the electron donor material transfers holes throughhole carrier layer 130 tocathode 120.Anode 160 andcathode 120 are in electrical connection via an external load so that electrons pass fromanode 160, through the load, and tocathode 120. - Electron acceptor materials of
active layer 140 can include fullerenes. In some embodiments,active layer 140 can include one or more unsubstituted fullerenes and/or one or more substituted fullerenes. Examples of unsubstituted fullerenes include C60, C70, C76, C78, C82, C84, and C92. Examples of substituted fullerenes include PCBM or fullerenes substituted with C1-C20 alkoxy optionally further substituted with C1-C20 alkoxy or halo (e.g., (OCH2CH2)2OCH3 or OCH2CF2OCF2CF2OCF3). Without wishing to be bound by theory, it is believed that fullerenes substituted with long-chain alkoxy groups (e.g., oligomeric ethylene oxides) or fluorinated alkoxy groups have improved solubility in organic solvents and can form an photoactive layer with improved morphology. - In some embodiments, the electron acceptor materials can include polymers (e.g., homopolymers or copolymers). A polymers mentioned herein include at least two identical or different monomer repeat units (e.g., at least 5 monomer repeat units, at least 10 monomer repeat units, at least 50 monomer repeat units, at least 100 monomer repeat units, or at least 500 monomer repeat units). A copolymer mentioned herein refers to a polymer that includes at least two co-monomers of differing structures. In some embodiments, the polymers used as an electron acceptor material can include one or more monomer repeat units listed in Tables 1 and 2 below. Specifically, Table 1 lists examples of the monomers that can be used as an electron donating monomer and can serve as a conjugative link. Table 2 lists examples of the monomers that can be used as an electron withdrawing monomer. Note that depending on the substituents, monomers listed in Table 1 can also be used as electron withdrawing monomers and monomers listed in Table 2 can also be used as electron donating monomers. Preferably, the polymers used as an electron acceptor material include a high molar percentage (e.g., at least about 50%, at least about 60%, at least about 70%, at least about 80%, at least about 90%) of an electron withdrawing monomer.
- Electron donor materials of
active layer 140 can include polymers (e.g., homopolymers or copolymers). In some embodiments, the polymers used as an electron donor material can include one or more monomer repeat units listed Tables 1 and 2. Preferably, the polymers used as an electron donor material include a high molar percentage (e.g., at least about 50%, at least about 60%, at least about 70%, at least about 80%, at least about 90%) of an electron donating monomer. In some embodiments, the polymers include a monomer containing C1-C20 alkoxy on a ring, which is optionally further substituted with C1-C20 alkoxy or halo (e.g., (OCH2CH2)2OCH3 or OCH2CF2OCF2CF2OCF3). Without wishing to be bound by theory, it is believed that polymers containing monomers substituted with long-chain alkoxy groups (e.g., oligomeric ethylene oxides) or fluorinated alkoxy groups have improved solubility in organic solvents and can form an photoactive layer with improved morphology. - Referring to formulas listed in Tables 1 and 2 above, each of X and Y, independently, can be CH2, O, or S; each of R1, R2, R3, R4, R5, R6, R7, and R8, independently, can be H, C1-C20 alkyl, C1-C20 alkoxy, aryl (e.g., phenyl or substituted phenyl), heteroaryl, C3-C20 cycloalkyl, C3-C20 heterocycloalkyl, halo, CN, NO2, or SO2R; and R7 can be H, C1-C20 alkyl, C1-C20 alkoxy, aryl (e.g., phenyl or substituted phenyl), heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl; in which R is C1-C20 alkyl, C1-C20 alkoxy, aryl, heteroaryl, C3-C20 cycloalkyl, or C3-C20 heterocycloalkyl. An alkyl can be saturated or unsaturated and branch or straight chained. A C1-C20 alkyl contains 1 to 20 carbon atoms (e.g., one, two, three, four, five, six, seven, eight, nine, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, and 20 carbon atoms). Examples of alkyl moieties include —CH3, —CH2—, —CH2═CH2—, —CH2—CH═CH2, and branched —C3H7. An alkoxy can be branch or straight chained and saturated or unsaturated. An C1-C20 alkoxy contains an oxygen radical and 1 to 20 carbon atoms (e.g., one, two, three, four, five, six, seven, eight, nine, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, and 20 carbon atoms). Examples of alkoxy moieties include —OCH3 and —OCH═C2H4. A cycloalkyl can be either saturated or unsaturated. A C3-C20 cycloalkyl contains 3 to 20 carbon atoms (e.g., three, four, five, six, seven, eight, nine, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, and 20 carbon atoms). Examples of cycloalkyl moieties include cyclohexyl and cyclohexen-3-yl. A heterocycloalkyl can also be either saturated or unsaturated. A C3-C20 heterocycloalkyl contains at least one ring heteroatom (e.g., O, N, and S) and 3 to 20 carbon atoms (e.g., three, four, five, six, seven, eight, nine, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, and 20 carbon atoms). Examples of heterocycloalkyl moieties include 4-tetrahydropyranyl and 4-pyranyl. An aryl can contain one or more aromatic rings. Examples of aryl moieties include phenyl, phenylene, naphthyl, naphthylene, pyrenyl, anthryl, and phenanthryl. A heteroaryl can contain one or more aromatic rings, at least one of which contains at least one ring heteroatom (e.g., O, N, and S). Examples of heteroaryl moieties include furyl, furylene, fluorenyl, pyrrolyl, thienyl, oxazolyl, imidazolyl, thiazolyl, pyridyl, pyrimidinyl, quinazolinyl, quinolyl, isoquinolyl, and indolyl.
- Alkyl, alkoxy, cycloalkyl, heterocycloalkyl, aryl, and heteroaryl mentioned herein include both substituted and unsubstituted moieties, unless specified otherwise. Examples of substituents on cycloalkyl, heterocycloalkyl, aryl, and heteroaryl include C1-C20 alkyl, C3-C20 cycloalkyl, C1-C20 alkoxy, aryl, aryloxy, heteroaryl, heteroaryloxy, amino, C1-C10 alkylamino, C1-C20 dialkylamino, arylamino, diarylamino, hydroxyl, halogen, thio, C1-C10 alkylthio, arylthio, C1-C10 alkylsulfonyl, arylsulfonyl, cyano, nitro, acyl, acyloxy, carboxyl, and carboxylic ester. Examples of substituents on alkyl include all of the above-recited substituents except C1-C20 alkyl. Cycloalkyl, heterocycloalkyl, aryl, and heteroaryl also include fused groups.
- The copolymers described above can be prepared by methods known in the art. For example, a copolymer can be prepared by a cross-coupling reaction between one or more comonomers containing two alkylstannyl groups and one or more comonomers containing two halo groups in the presence of a transition metal catalyst. As another example, a copolymer can be prepared by a cross-coupling reaction between one or more comonomers containing two borate groups and one or more comonomers containing two halo groups in the presence of a transition metal catalyst. The comonomers can be prepared by the methods described herein or by the methods know in the art, such as those described in Coppo et al., Macromolecules 2003, 36, 2705-2711 and Kurt et al., J. Heterocycl. Chem. 1970, 6, 629, the contents of which are hereby incorporated by reference.
- Table 3 below lists three exemplary polymers (i.e., polymers 1-3) described in the Summary section above. These polymers can have unique properties, which make them particularly suitable as charge carriers in the active layer of a photovoltaic cell. Polymers 1 and 2 can be obtained by the methods described in Examples 4 and 7 below.
- Generally, one co-monomer in the polymers described in the Summary section above is a cyclopentadithiophene. An advantage of a co-polymer containing a cyclopentadithiophene moiety is that its absorption wavelength can shift toward the red and near IR portion (e.g., 650-800 nm) of the electromagnetic spectrum, which is not accessible by most other polymers. When such a co-polymer is incorporated into a photovoltaic cell, it enables the cell to absorb the light in this region of the spectrum, thereby increasing the current and efficiency of the cell.
- The polymers described above can be useful in solar power technology because the band gap is close to ideal for a photovoltaic cell (e.g., a polymer-fullerene cell). The HOMO level of the polymers can be positioned correctly relative to the LUMO of an electron acceptor (e.g., PCBM) in a photovoltaic cell (e.g., a polymer-fullerene cell), allowing for high cell voltage. The LUMO of the polymers can be positioned correctly relative to the conduction band of the electron acceptor in a photovoltaic cell, thereby creating efficient transfer of an electron to the electron acceptor. For example, using a polymer having a band gap of about 1.4-1.6 eV can significantly enhance cell voltage. Cell performance, specifically efficiency, cam benefit from both an increase in photocurrent and an increase in cell voltage, and can approach and even exceed 15% efficiency. The positive charge mobility of the polymers can be relatively high and approximately in the range of 10−4 to 10−1 cm−2/Vs. In general, the relatively high positive charge mobility allows for relatively fast charge separation. The polymers can also be soluble in an organic solvent and/or film forming. Further, the polymers can be optically non-scattering.
- Components in photovoltaic cell other than the electro acceptor materials and the electron donor materials are known in the art, such as those described in U.S. patent application Ser. No. 10/723,554, the contents of which are incorporated herein by references.
- In some embodiments, the polymer described above can be used as an electron donor material or an electro acceptor material in a system in which two photovoltaic cells share a common electrode. Such a system is also known as tandem photovoltaic cell. Examples of tandem photovoltaic cells are discussed in U.S. patent application Ser. No. 10/558,878, filed Nov. 29, 2005, the contents of which are hereby incorporated by reference.
- As an example,
FIG. 2 is a schematic of a tandemphotovoltaic cell 200 having asubstrate 210, threeelectrodes photoactive layers Electrode 240 is shared betweenphotoactive layers electrodes electrodes electrodes more electrodes electrodes electrodes electrodes - Each of
photoactive layers photoactive layer 230 has the same band gap as the semiconductive material inphotoactive layer 250. In certain embodiments, the semiconductive material inphotoactive layer 230 has a band gap different from that of the semiconductive material inphotoactive layer 250. Without wishing to be bound by theory, it is believed that incident light not absorbed by one photoactive layer can be absorbed by the other photoactive layer, thereby maximizing the absorption of the incident light. - In some embodiments, at least one of
photoactive layers photoactive layers -
Substrate 210 can be formed of one or more suitable polymers, such as those described in U.S. patent application Ser. No. 10/723,554. In some embodiments, an additional substrate (not shown inFIG. 2 ) can be disposed onelectrode 260. -
Photovoltaic cell 200 can further contain a hole carrier layer (not shown inFIG. 2 ) and a hole blocking layer (not shown inFIG. 2 ), such as those described in U.S. patent application Ser. No. 10/723,554. - While photovoltaic cells have been described above, in some embodiments, the polymers described herein can be used in other devices and systems. For example, the polymers can be used in suitable organic semiconductive devices, such as field effect transistors, photodetectors (e.g., IR detectors), photovoltaic detectors, imaging devices (e.g., RGB imaging devices for cameras or medical imaging systems), light emitting diodes (LEDs) (e.g., organic LEDs or IR or near IR LEDs), lasing devices, conversion layers (e.g., layers that convert visible emission into IR emission), amplifiers and emitters for telecommunication (e.g., dopants for fibers), storage elements (e.g., holographic storage elements), and electrochromic devices (e.g., electrochromic displays).
- The following examples are illustrative and not intended to be limiting.
-
- 4H-Cyclopenta[2,1-b;3,4-b′]dithiophene was synthesized according to literature procedure illustrated in Coppo et al., Macromolecules 2003, 36, 2705-2711. All other starting materials were purchased from Sigma-Aldrich and used as received.
- 4H-Cyclopenta[2,1-b;3,4-b′]dithiophene (1.5 g, 0.00843 mol) was dissolved in DMSO (50 mL). The solution was purged with nitrogen, and grounded KOH (1.89 g, 0.0337 mol) and sodium iodide (50 mg) were added, followed by hexyl bromide (3.02 g, 0.0169 mol). The reaction was stirred for 17 h under nitrogen at room temperature. Water was added and the reaction was extracted with t-butyl-methyl ether. The organic layer was separated and dried over magnesium sulfate. Solvent was removed under vacuum and the residue was purified by chromatography using hexanes as eluent. Fractions containing pure 4,4-dixeyl-4H-cyclopenta[2,1-b;3,4-b]dithiophene product were combined and the solvents evaporated. The product was obtained as a colorless oil. Yield: 2.36 g (81%).
-
- Starting material 4,4-dihexyl-4H-cyclopenta[2,1-b;3,4-b]dithiophene (1.5 g, 0.00433 mol) was dissolved in dry THF (30 mL). The solution was cooled to −78° C. and butyl lithium (6.1 mL, 0.0130 mol) was added drop wise. The reaction was stirred at this temperature for 2 h and warmed to room temperature, stirred for 3 h. Again reaction was cooled to −78° C. and trimethyltin chloride (1 M in hexanes, 16.0 mL, 16.0 mmol) was added dropwise. The reaction was allowed to warm to rt and stirred for 17 h. Water was added and the reaction was extracted with toluene. The organic layer was washed with water and dried over sodium sulfate. Solvent was removed under vacuum and the residue was dissolved in toluene, and quickly passed through a plug of silica gel pretreated with triethyl amine. Solvent was removed and the residue dried under vacuum to afford 2.65 g of the bis(trimethyltin) monomer. 1H NMR (CDCl3, 200 MHz): 6.97 (m, 2H), 1.84 (m, 4H), 1.20 (m, 16H), 0.88 (m, 6H), 0.42 (m, 18H).
-
- 4,4-Dihexyl-4H-cyclopenta[2,1-b;3,4-b]dithiophene (2.2 g, 0.0065 mol) was dissolved in dry THF (20 mL). The solution was cooled to −78° C. BuLi (7.62, 2.5 M in hexanes, 0.019 mol) was then added to the solution. The reaction mixture was allowed to warm to room temperature and was stirred for 5 hours. The mixture was then cooled again to −78° C. and Bu3SnCl (7.44 g, 0.0229 mol) was added. The reaction mixture was allowed to warm to room temperature and was stirred for another 48 hours. Water was then added and the mixture was extracted with dihicholomethane. Organic layer was collected, dried over anhydrous Na2SO4, and concentrated. The residue thus obtained was dissolved in hexane and quickly passed through a plug of silica gel pretreated with triethylamine. The solvent was removed and the residue was dried under vacuum to afford bis-(tributylstannyl)-4,4-dihexyl-cyclopenta[2,1-b:3,4-b′]dithiophene (5.7 g).
-
- Bis-(tributylstannyl)-4,4-dihexyl-cyclopenta[2,1-b:3,4-b′]dithiophene (0.775 g, 0.000816 mol) and 4,7-dibromo-2,1,3-benzothiadiazole (0.24 g, 0.000816 mol) were first dissolved in toluene. After the reaction was purged with nitrogen, palladium tretakistriphenylphosphine (15 mg, 0.0065 mmol) was added. The reaction mixture was heated at 100° C. for 24 hour. After the solvent was removed, the residue was washed with acetone and extracted in a Soxlet extractor for 8 hours to afford the product as an insoluble blue solid.
-
- 4H-Cyclopenta[2,1-b;3,4-b]dithiophene (1.5 g, 0.00843 mol) was dissolved in DMSO (50 mL). After the solution was purged with nitrogen, and grounded KOH (1.89 g, 0.0337 mol), sodium iodide (50 mg), and 2-ethylhexyl bromide (3.25 g, 0.0169 mol) were sequentially added. The reaction mixture was stirred overnight under nitrogen (c.a. 16 hours). Water was added and the reaction was extracted with t-butylmethyl ether. The organic layer was collected, dried over magnesium sulfate, and concentrated. The residue was purified by chromatography using hexanes as eluent. Fractions containing pure 4,4-Bis-(2-ethyl-hexyl)-4H-cyclopenta[2,1-b;3,4-b]dithiophene product were combined and concentrated. The product was obtained as a colorless oil after drying under vacuum. Yield: 2.68 g (79%). 1H NMR (CDCl3, 250 MHz): 7.13 (m, 2H), 6.94 (m, 2H), 1.88 (m, 4H), 0.94 (m, 16H), 0.78 (t, 6.4 Hz, 6H), 0.61 (t, 7.3 Hz, 6H).
-
- Starting material 4,4-Bis-(2-ethyl-hexyl)-4H-cyclopenta[2,1-b;3,4-b]dithiophene (1.5 g, 0.00372 mol) was dissolved in dry THF (20 mL). After the solution was cooled to −78° C., butyl lithium (5.21 mL, 0.0130 mol) was added dropwise. The reaction mixture was stirred at this temperature for 1 hour. It was then warmed to room temperature and stirred for another 3 hours. The mixture was again cooled to −78° C. and trimethyltin chloride (1 M in hexane, 15.6 mL, 15.6 mmol) was added dropwise. The reaction mixture was allowed to warm to room temperature and stirred overnight (c.a. 16 hours).
- Water was added and the reaction was extracted with toluene. The organic layer was washed with water, dried over sodium sulfate, and concentrated. The residue was dissolved in toluene, and quickly passed through a small plug of silica gel pretreated with triethylamine. The solvent was removed and the residue was dried under vacuum. 1.25 g of the product was obtained. 1H NMR (CDCl3, 250 MHz): 6.96 (m, 2H), 1.85 (m, 4H), 1.29 (m, 2H), 0.92 (m, 16H), 0.78 (t, 6.8 Hz, 6H), 0.61 (t, 7.3 Hz, 6H), 0.38 (m, 18H).
-
- Bis-(trimethylstannyl)-4,4-di(2-ethylhexyl)-cyclopenta[2,1-b:3,4-b]dithiophene (0.686 g, 0.000943 mol) and 4,7-dibromo-2,1,3-benzothiadiazole (0.269 g, 0.000915 mol) were dissolved in toluene (20 mL). After the reaction was purged with nitrogen, tris(dibenzylideneacetone)dipalladium(0) (25.1 mg, 0.0275 mmol) and triphenylphosphine (57.6 mg, 0.220 mmol) were added. The reaction was further purged with nitrogen for 10 minutes and heated to 120° C. under nitrogen for 24 hours. The solvent was removed under vacuum and the residue was dissolved in chloroform. After the mixture was poured into methanol (500 mL), the blue precipitate thus obtained was collected by filtration, washed with methanol, and dried. The precipitate was dissolved in chloroform (30 mL) under heating, and filtered through a 0.45 μm membrane. The solution was loaded on to recycling HPLC (2H+2.5H column on a Dychrome recycling HPLC, 5 cycles for each injection), in 3 mL portions for purification. Higher-molecular-weight fractions were combined to give 120 mg pure polymer (Mn=35 kDa).
-
- 4,4-Dihexyl-2,6-bis-trimethylstannanyl-4H-cyclopenta[2,1-b;3,4-b]dithiophene (0.0863 g, 0.000128 mol), 4,4-bis-(2-ethyl-hexyl)-2,6-bis-trimethylstannanyl-4H-cyclopenta[2,1-b;3,4-b]dithiophene (0.187 g, 0.000257 mol), and 4,7-Dibromo-benzo[1,2,5]thiadiazole (0.111 g, 0.000378 g) were dissolved in toluene (15 mL) and the solution was degassed and purged with N2. Tris(dibenzylideneacetone)dipalladium(0) (6.78 mg, 0.0074 mmol) and triphenylphosphine (15.5 mg, 0.0 593 mmol) were then added. The reaction was purged again with nitrogen for 30 minutes and heated at 120° C. under nitrogen. The solvent was then removed under vacuum. The residue was dissolved in chloroform and the solution was added into methanol. The precipitates were collected and extracted with hexane for 24 hours and then extracted with chloroform for 8 hours. The resultant blue solution was concentrated and added to methanol. The precipitates were collected to afford a first fraction of the polymer (70 mg). The remaining materials on the thimble was further extracted with chloroform for 20 hours. 20 mg additional polymer was collected.
-
- 100 mL oven dried Schlenk flask was charged with 1.097 g (2.72 mmol) of 4H-4,4-bis(2′-ethylhexyl)cyclopenta[2,1-b:3,4-b′]dithiophene. The flask was evacuated and purged with argon three times. To this flask was then added 20 mL of dry, distilled THF. The resulting solution was cooled to −78° C. and 4.35 mL (10.88 mmol, 4 equiv.) of 2.5M BuLi was added dropwise. The reaction was stirred for 1 hour at −78° C. and then warmed to room temperature and stirred for an additional 3 hours. The solution was cooled again to −78° C. and 2.77 mL (13.6 mmol, 5 equiv.) of 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane was added in one portion via syringe. The reaction was stirred at −78° C. for 1 hour and then allowed to warm to room temperature overnight. The solution was poured into water and extracted with 4×150 mL of methyl tert-butyl ether. The organic layers were combined and washed with 2×150 mL of brine, dried with anhydrous MgSO4, and filtered. The solvent was removed under vacuum to yield and orange oil, which was purified by column chromatography (5% EtOAc in hexanes) to yield a colorless, viscous oil, 1.34 g (75% yield).
-
- A 50 mL Schlenk flask was charged with 0.309 g (0.472 mmol) of 4H-4,4-bis(2′-ethylhexyl)cyclopenta[2,1-b:3,4-b′]dithiophene-2,6-bis(pinacolborate) ester prepared in Example 9, 0.367 g (0.510 mmol) of 5,5′-dibromo-3″,4″-dihexyl-a-pentathiophene (its synthesis was described in WO 2005/092947, which is incorporated herein by reference) 0.0013 g (0.00185 mmol) of PdCl2(PPh3)2, and 0.057 g (0.142 mmol) of trioctylmethylammonium chloride (Aliquot 336, Aldrich, St. Louis, Mo.). The flask was fitted with a reflux condenser and the flask was evacuated and refilled with nitrogen three times. The solids were dissolved in 6 mL of toluene and then 0.88 mL of 2M Na2CO3 were added via syringe. The reaction was then heated to 95° C. with stiffing for 5 hours. Phenylboronic acid (0.031 g, 0.250 mmol) and 0.0016 g (0.00228 mmol) of PdCl2(PPh3)2 were dissolved in 1 mL of THF and added to the reaction mixture, and stiffing was continued for 16 h at 95° C. The reaction mixture was diluted with toluene (50 mL) and the organic layer was separated and washed with warm water (3×50 mL). The solution was then treated with an aqueous solution of diethyldithiocarbamic acid sodium salt trihydrate (7.5%, DDC, 5 mL) and heated at 80° C. overnight. The aqueous layer was separated and discarded and the organic layer was washed with warm water (3×50 mL) and the polymer precipitated into methanol (500 mL). The polymer was collected by filtration, washed with methanol (50 mL) and redissolved in hot toluene (200 mL). The hot polymer solution was passed through a tightly packed column of celite (1×8 cm), silica get (3×8 cm), and basic alumina (3×8 cm) (previously rinsed with 200 mL of hot toluene). The polymer solution was collected and the volume concentrated to approximately 50 mL. The polymer was precipitated into methanol (500 mL), washed with methanol (100 mL), acetone (100 mL) and again with methanol (100 mL). The polymer was then dried in vacuo overnight to yield a brick red material. Yield: 0.327 g.
- The polymer solar cells were fabricated by doctor-blading a blend of the polymer prepared in Example 7 (PCPDTBT) and PC61BM or PC71BM (purchased from Nano-C, Westwood, Mass.) in a 1:3 w/w ratio sandwiched between a transparent anode and an evaporated metal cathode. The transparent anode was an indium tin oxide (ITO)-covered glass substrate (Merck, Whitehouse Station, N.J.) which was coated with a ˜60 nm thick PEDOT:PSS layer (Baytron PH from H. C. Starck) applied by doctorblading. The ITO-glass-substrate was cleaned by ultrasonification subsequently in acetone, isopropyl alcohol and deionized water. The cathode, a bilayer of a thin (1 nm) LiF layer covered with 80 nm Al, was prepared by thermal evaporation. PCPDTBT and PC61BM or PC71BM were dissolved together in o-dichlorobenzene (ODCB) to give an overall 40 mg/ml solution and was stirred overnight at 60-70° C. inside a glovebox. The active layer thickness, as determined by AFM, was between 150-250 nm. Device characterization was done under AM 1.5G irradiation (100 mW/cm2) on an Oriel Xenon solar simulator with a well calibrated spectral mismatch of 0.98 jV-characteristics were recorded with a Keithley 2400. Active areas were in the range of 15 to 20 mm2. EQE was detected with a lock-in amplifier under monochromatic illumination. Calibration of the incident light was done with a monocrystalline silicon diode. Mobility measurements were done using an Agilent 4155C parameter analyzer. Absorption measurements were done inside the glovebox with an Avantes fiberoptic spectrometer or outside with a HP spectrometer.
- The interaction with PCBM and the photoinduced charge transfer was investigated by PL quenching. The PL of pristine PCPDTBT versus PCPDTBT/PCBM composites was measured at liquid N2 temperatures in a cryostat, excitation was provided by an Ar laser at 488 nm.
- Electrochemical experiments were carried out on dropcast polymer films at room temperature in a glovebox. The supporting electrolyte was tetrabutylammonium-hexafluorophosphate (TBAPF6, electrochemical grade, Aldrich) ˜0.1 M in acetonitrile anhydrous (Aldrich). The working electrode (WE), as well as the counter electrode (CE), was a platinum foil. A silver wire coated with AgCl was used as a reference electrode (RE). After each measurement, the RE was calibrated with ferrocene (E0=400 mV vs. NHE) and the potential axis was corrected to NHE (using −4.75 eV for NHE24,25) according to the difference of E0 (ferrocene) and the measured E1/2 (ferrocene). λmax (CHCl3)=710 nm, λband edge (CHCl3)=780 nm, band gap (CHCl3)=1.59 eV, λmax (film)=700-760 nm, λband edge (film)=855 nm, band gap (film)=1.45 eV, HOMO=−5.3 eV, −5.7 eV (electrochem), LUMO=−3.85 eV, −4.25 eV, μ+=2×10−2 cm2/Vs (TOF), 1×10−3 cm2/Vs (FET).
- Other embodiments are in the claims.
Claims (7)
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Also Published As
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JP2009506519A (en) | 2009-02-12 |
US7781673B2 (en) | 2010-08-24 |
US20070017571A1 (en) | 2007-01-25 |
EP2716677A1 (en) | 2014-04-09 |
EP1902439A4 (en) | 2011-04-06 |
EP1902439A2 (en) | 2008-03-26 |
EP1902439B1 (en) | 2014-01-08 |
WO2007011739A3 (en) | 2009-04-23 |
US20070158620A1 (en) | 2007-07-12 |
CA2614958A1 (en) | 2007-01-25 |
WO2007011739A2 (en) | 2007-01-25 |
US8058550B2 (en) | 2011-11-15 |
US20140224331A1 (en) | 2014-08-14 |
US20070020526A1 (en) | 2007-01-25 |
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