WO2014128648A1 - Luminescent solar concentrator comprising disubstituted naphthothiadiazole compounds - Google Patents
Luminescent solar concentrator comprising disubstituted naphthothiadiazole compounds Download PDFInfo
- Publication number
- WO2014128648A1 WO2014128648A1 PCT/IB2014/059135 IB2014059135W WO2014128648A1 WO 2014128648 A1 WO2014128648 A1 WO 2014128648A1 IB 2014059135 W IB2014059135 W IB 2014059135W WO 2014128648 A1 WO2014128648 A1 WO 2014128648A1
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- WO
- WIPO (PCT)
- Prior art keywords
- carbon atoms
- bound
- optionally
- heteroatoms
- saturated
- Prior art date
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- TWEILHAJXWAJIW-UHFFFAOYSA-N benzo[e][1,2,3]benzothiadiazole Chemical class C1=CC2=CC=CC=C2C2=C1SN=N2 TWEILHAJXWAJIW-UHFFFAOYSA-N 0.000 title description 8
- -1 disubstituted naphthothiadiazole compound Chemical class 0.000 claims abstract description 72
- 125000004432 carbon atom Chemical group C* 0.000 claims abstract description 55
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 46
- 125000003118 aryl group Chemical group 0.000 claims abstract description 30
- 125000005842 heteroatom Chemical group 0.000 claims abstract description 28
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 23
- 239000010703 silicon Substances 0.000 claims abstract description 23
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 22
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 22
- 239000001301 oxygen Substances 0.000 claims abstract description 22
- 125000003367 polycyclic group Chemical group 0.000 claims abstract description 22
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 22
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 22
- 239000011593 sulfur Substances 0.000 claims abstract description 22
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 claims abstract description 21
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052711 selenium Inorganic materials 0.000 claims abstract description 21
- 239000011669 selenium Substances 0.000 claims abstract description 21
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 9
- 125000000753 cycloalkyl group Chemical group 0.000 claims abstract description 8
- 125000003837 (C1-C20) alkyl group Chemical group 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims description 7
- 125000001424 substituent group Chemical group 0.000 claims description 3
- 125000003545 alkoxy group Chemical group 0.000 abstract description 4
- 125000000217 alkyl group Chemical group 0.000 abstract description 4
- 230000005855 radiation Effects 0.000 description 21
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 18
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 16
- 239000000463 material Substances 0.000 description 13
- 239000011159 matrix material Substances 0.000 description 11
- 238000010521 absorption reaction Methods 0.000 description 10
- 239000010408 film Substances 0.000 description 10
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 10
- 229920000642 polymer Polymers 0.000 description 10
- 239000004926 polymethyl methacrylate Substances 0.000 description 10
- 239000000243 solution Substances 0.000 description 9
- 239000002904 solvent Substances 0.000 description 9
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 8
- 229910052731 fluorine Inorganic materials 0.000 description 8
- 239000011737 fluorine Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- RFFLAFLAYFXFSW-UHFFFAOYSA-N 1,2-dichlorobenzene Chemical compound ClC1=CC=CC=C1Cl RFFLAFLAYFXFSW-UHFFFAOYSA-N 0.000 description 6
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 5
- 238000000862 absorption spectrum Methods 0.000 description 5
- 239000000460 chlorine Substances 0.000 description 5
- 229910052801 chlorine Inorganic materials 0.000 description 5
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 5
- 238000001228 spectrum Methods 0.000 description 5
- 229920005478 Altuglas® VSUVT Polymers 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000007850 fluorescent dye Substances 0.000 description 4
- 125000005843 halogen group Chemical group 0.000 description 4
- 238000005259 measurement Methods 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
- FNQJDLTXOVEEFB-UHFFFAOYSA-N 1,2,3-benzothiadiazole Chemical class C1=CC=C2SN=NC2=C1 FNQJDLTXOVEEFB-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 3
- 125000003277 amino group Chemical group 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 125000004093 cyano group Chemical group *C#N 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 125000003638 stannyl group Chemical group [H][Sn]([H])([H])* 0.000 description 3
- 229930192474 thiophene Natural products 0.000 description 3
- FCEHBMOGCRZNNI-UHFFFAOYSA-N 1-benzothiophene Chemical compound C1=CC=C2SC=CC2=C1 FCEHBMOGCRZNNI-UHFFFAOYSA-N 0.000 description 2
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- ROSDSFDQCJNGOL-UHFFFAOYSA-N Dimethylamine Chemical compound CNC ROSDSFDQCJNGOL-UHFFFAOYSA-N 0.000 description 2
- MZRVEZGGRBJDDB-UHFFFAOYSA-N N-Butyllithium Chemical compound [Li]CCCC MZRVEZGGRBJDDB-UHFFFAOYSA-N 0.000 description 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 2
- YNHIGQDRGKUECZ-UHFFFAOYSA-L bis(triphenylphosphine)palladium(ii) dichloride Chemical compound [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
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 229910052794 bromium Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- ZCSHNCUQKCANBX-UHFFFAOYSA-N lithium diisopropylamide Chemical compound [Li+].CC(C)[N-]C(C)C ZCSHNCUQKCANBX-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012074 organic phase Substances 0.000 description 2
- YNPNZTXNASCQKK-UHFFFAOYSA-N phenanthrene Chemical compound C1=CC=C2C3=CC=CC=C3C=CC2=C1 YNPNZTXNASCQKK-UHFFFAOYSA-N 0.000 description 2
- WGYKZJWCGVVSQN-UHFFFAOYSA-N propylamine Chemical compound CCCN WGYKZJWCGVVSQN-UHFFFAOYSA-N 0.000 description 2
- XSCHRSMBECNVNS-UHFFFAOYSA-N quinoxaline Chemical compound N1=CC=NC2=CC=CC=C21 XSCHRSMBECNVNS-UHFFFAOYSA-N 0.000 description 2
- 239000012047 saturated solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 125000000008 (C1-C10) alkyl group Chemical group 0.000 description 1
- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 description 1
- 125000000453 2,2,2-trichloroethyl group Chemical group [H]C([H])(*)C(Cl)(Cl)Cl 0.000 description 1
- 125000004206 2,2,2-trifluoroethyl group Chemical group [H]C([H])(*)C(F)(F)F 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- SNRUBQQJIBEYMU-UHFFFAOYSA-N Dodecane Natural products CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 229920001283 Polyalkylene terephthalate Polymers 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000006619 Stille reaction Methods 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- QFJONEZYQZBXRX-UHFFFAOYSA-N c1c[s]c(-c2c(cccc3)c3c(-c3ccc[s]3)c3n[s]nc23)c1 Chemical compound c1c[s]c(-c2c(cccc3)c3c(-c3ccc[s]3)c3n[s]nc23)c1 QFJONEZYQZBXRX-UHFFFAOYSA-N 0.000 description 1
- 125000002837 carbocyclic group Chemical group 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- PBAYDYUZOSNJGU-UHFFFAOYSA-N chelidonic acid Natural products OC(=O)C1=CC(=O)C=C(C(O)=O)O1 PBAYDYUZOSNJGU-UHFFFAOYSA-N 0.000 description 1
- 125000000068 chlorophenyl group Chemical group 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 125000001995 cyclobutyl group Chemical group [H]C1([H])C([H])([H])C([H])(*)C1([H])[H] 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
- 125000001511 cyclopentyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C1([H])[H] 0.000 description 1
- 125000001559 cyclopropyl group Chemical group [H]C1([H])C([H])([H])C1([H])* 0.000 description 1
- 125000002704 decyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001028 difluoromethyl group Chemical group [H]C(F)(F)* 0.000 description 1
- LAWOZCWGWDVVSG-UHFFFAOYSA-N dioctylamine Chemical compound CCCCCCCCNCCCCCCCC LAWOZCWGWDVVSG-UHFFFAOYSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 125000004216 fluoromethyl group Chemical group [H]C([H])(F)* 0.000 description 1
- 125000001207 fluorophenyl group Chemical group 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 230000026030 halogenation Effects 0.000 description 1
- 238000005658 halogenation reaction Methods 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- 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 1
- 125000004464 hydroxyphenyl group Chemical group 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- GRVDJDISBSALJP-UHFFFAOYSA-N methyloxidanyl Chemical group [O]C GRVDJDISBSALJP-UHFFFAOYSA-N 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 125000006501 nitrophenyl group Chemical group 0.000 description 1
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 1
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 1
- UQPUONNXJVWHRM-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 UQPUONNXJVWHRM-UHFFFAOYSA-N 0.000 description 1
- 125000000538 pentafluorophenyl group Chemical group FC1=C(F)C(F)=C(*)C(F)=C1F 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 125000005008 perfluoropentyl group Chemical group FC(C(C(C(C(F)(F)F)(F)F)(F)F)(F)F)(F)* 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 125000004351 phenylcyclohexyl group Chemical group C1(=CC=CC=C1)C1(CCCCC1)* 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007928 solubilization Effects 0.000 description 1
- 238000005063 solubilization Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 1
- VJYJJHQEVLEOFL-UHFFFAOYSA-N thieno[3,2-b]thiophene Chemical compound S1C=CC2=C1C=CS2 VJYJJHQEVLEOFL-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 125000004014 thioethyl group Chemical group [H]SC([H])([H])C([H])([H])* 0.000 description 1
- 125000004055 thiomethyl group Chemical group [H]SC([H])([H])* 0.000 description 1
- 125000003944 tolyl group Chemical group 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 125000003866 trichloromethyl group Chemical group ClC(Cl)(Cl)* 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
- H01L31/055—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means where light is absorbed and re-emitted at a different wavelength by the optical element directly associated or integrated with the PV cell, e.g. by using luminescent material, fluorescent concentrators or up-conversion arrangements
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/10—Non-macromolecular compounds
- C09K2211/1018—Heterocyclic compounds
- C09K2211/1025—Heterocyclic compounds characterised by ligands
- C09K2211/1044—Heterocyclic compounds characterised by ligands containing two nitrogen atoms as heteroatoms
- C09K2211/1051—Heterocyclic compounds characterised by ligands containing two nitrogen atoms as heteroatoms with sulfur
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/52—PV systems with concentrators
Definitions
- the present invention relates to a luminescent solar concentrator (LSC) comprising at least one disubstituted naphthothiadiazole compound.
- LSC luminescent solar concentrator
- the present invention also relates to the use of at least one disubstituted naphthothiadiazole compound in the construction of luminescent solar concentrators (LSCs) .
- LSCs luminescent solar concentrators
- the present invention also relates to a photovoltaic device (or solar device) selected, for example, from photovoltaic cells (or solar cells), photovoltaic modules (or solar modules), on both rigid and flexible supports, comprising a luminescent solar concentrator (LSC) including at least one disubstituted naphthothiadiazole compound.
- a photovoltaic device selected, for example, from photovoltaic cells (or solar cells), photovoltaic modules (or solar modules), on both rigid and flexible supports, comprising a luminescent solar concentrator (LSC) including at least one disubstituted naphthothiadiazole compound.
- LSC luminescent solar concentrator
- single-junction photovoltaic cells or solar cells are not capable of efficiently exploiting all solar radiation. Their efficiency, in fact, is maximum only within a certain spectrum range which comprises a part of visible radiation and a part of infrared radiation.
- Spectrum converter materials which can capture solar radiation outside the optimal spectral range and convert it to effective radiation, can be used for enhancing the performance of photovoltaic cells (or solar cells) .
- luminescent solar concentrators LSCs
- LSCs luminescent solar concentrators
- Said luminescent solar concentrators generally consist of large sheets of material transparent to solar radiation, in which fluorescent substances are dispersed or chemically bound to said material, which act as spectrum converters. Due to the effect of the optical phenomenon of total reflection, the radiation emitted by the fluorescent molecules is "guided" towards the thin edges of the sheet wherein it is concentrated on photovoltaic cells (or solar cells) positioned therein. In this way, large surfaces of low- cost materials (photoluminescent sheets) can be used for concentrating the light on small surfaces of high- cost materials [photovoltaic cells (or solar cells) ] .
- a fluorescent compound should have numerous characteristics for being advantageously used in the construction of luminescent solar concentrators (LSCs) and these are not always compatible with each other.
- the frequency of the radiation emitted by fluorescence must correspond to an energy higher than the threshold value below which the semiconductor, representing the core of the photovoltaic cell, is no longer able to function.
- the absorption spectrum of the fluorescent compound should be as extensive as possible, so as to absorb most of the inciding solar radiation and then re-emit it at the desired frequency.
- the absorption of the solar radiation be extremely intense, so that the fluorescent compound can exert its function at the lowest possible concentrations, avoiding the use of large quantities.
- the absorption process of solar radiation and its subsequent re-emission at lower frequencies must take place with the highest possible efficiency, minimizing the so-called non-radiative losses, often collectively indicated with the term "thermalization” : the efficiency of the process is measured by its quantic yield.
- the absorption and the emission frequencies must be as different as possible, as otherwise the radiation emitted by a molecule of the fluorescent compound would be absorbed, and at least partially diffused, by the adjacent molecules. Said phenomenon, generally called self-absorption, inevitably leads to a significant loss in efficiency.
- the difference between the frequencies of the peak with the lower frequency of the absorption spectrum and of the peak of the radiation emitted, is normally indicated as Stokes shift and measured in nm (i.e. it is not the difference between the two frequencies that is measured, but the difference between the two wavelengths which correspond to them) .
- benzothiadiazole compounds in particular 4 , 7-di- ( thien-2 ' -yl ) -2 , 1 , 3-benzothia- diazole (DTB) , are fluorescent compounds which can be used in the construction of luminescent solar concentrators (LSCs) .
- LSCs luminescent solar concentrators
- DTB 7-di- (thien-2 '-yl) -2,1, 3-benzothiadiazole
- DTB is characterized by an emission centred around 579 nm, which corresponds to an energy well above the minimum threshold value for the functioning of photovoltaic cells (or solar cells), said threshold corresponding, for example, to a wavelength of about 1100 nm for the most widely-used photovoltaic cells (or solar cells), based on silicon.
- its absorption of light radiation is intense and extends over a relatively wide range of wavelengths, indicatively ranging from 550 nm (green radiation wavelength) to ultraviolet.
- disubstituted naphthothiadiazole compounds having a specific general formula can be advantageously used in the construction of luminescent solar concentrators (LSCs) .
- Said luminescent solar concentrators (LSCs) can be advantageously used in the construction of photovoltaic devices (or solar devices) such as, for example, photovoltaic cells (or solar cells), photovoltaic modules (or solar modules), on both rigid and flexible supports.
- Said disubstituted naphthothiadiazole compounds in fact, have an absorption spectrum which extends much more towards red with respect to known benzothiadiazole compounds.
- said disubstituted naphthothiadiazole compounds have higher Stokes shifts than those of the known benzothiadiazole compounds .
- An object of the present invention therefore relates to a luminescent solar concentrator (LSC) comprising at least one disubstituted naphthothiadiazole compound having general formula (I) :
- Ri, R2, R3, R4, R5, R6 and R 7 equal to or different from each other, represent a hydrogen atom; or they are selected from linear or branched Ci-C20 f preferably C1-C10, alkyl groups, optionally containing heteroatoms, cycloalkyl groups optionally substituted, aryl groups optionally substituted, linear or branched Ci-C20 f preferably C1-C10, alkoxyl groups, optionally substituted;
- Ri and R2 can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
- R 2 and R3 can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
- Ri and R 4 can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
- R 5 and ]3 ⁇ 4 can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
- R6 and R 7f can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium.
- the substituents Ri, R 2 , R3, R4, R5, R6 and R 7 represent a hydrogen atom.
- a particularly preferred aspect of the present invention therefore relates to a luminescent solar concentrator (LSC) comprising 4 , 9-bis- ( thien-2 ' -yl ) - naphtho [ 2 , 3-c] [ 1 , 2 , 5 ] -thiadiazole (DTN) having formula (la)
- the naphthothiadiazole compound having general formula (I) has an absorption which, with respect to that of 4 , 7-di- ( thien-2 ' -yl ) -2 , 1 , 3- benzothiadiazole (DTB) , extends much more towards red: said absorption is intense and extensive over a relatively wide wavelengths range which, for example, for 4 , 9-bis- ( thien-2 ' -yl ) -naphtho [ 2 , 3-c ] [ 1 , 2 , 5 ] -thia- diazole (DTN) having formula (la) ranges, from 200 nm to 600 nm.
- said compound having general formula (I) has a particularly high Stokes shift.
- 4,9- bis- (thien-2 '-yl) -naphtho [2, 3-c] [1,2,5] -thiadiazole (DTN) having formula (la) has a Stokes shift, in dichloromethane solution, equal to 202 nm : therefore a Stokes shift higher than that, already high, of 4 , 7-di- ( thien-2 ' -yl ) -2 , 1 , 3-benzothiadiazole (DTB) equal to 134 nm (measured under the same conditions ) .
- C1-C2 0 alkyl groups refers to linear or branched alkyl groups having from 1 to 20 carbon atoms. Specific examples of C1 -C2 0 alkyl groups are: methyl, ethyl, ⁇ -propyl, iso-propyl, n-butyl, iso-butyl, t- butyl, pentyl, ethyl-hexyl, hexyl, heptyl, octyl, nonyl, decyl, dodecyl .
- C 1 -C2 0 alkyl groups optionally containing heteroatoms refers to linear or branched alkyl groups having from 1 to 20 carbon atoms, saturated or unsaturated, wherein at least one of the hydrogen atoms is substituted with a heteroatom selected from: halogens such as, for example, fluorine, chlorine, preferably fluorine; nitrogen; sulfur; oxygen.
- C1 -C2 0 alkyl groups optionally containing heteroatoms are: fluoromethyl, difluoromethyl, trifluoromethyl , trichloromethyl , 2 , 2 , 2-trifluoroethyl , 2,2, 2-trichloroethyl, 2,2,3, 3-tetrafluoropropyl,
- cycloalkyl groups refers to cycloalkyl groups having from 3 to 10 carbon atoms. Said cycloalkyl groups can be optionally substituted with one or more groups, equal to or different from each other, selected from: halogen atoms such as, for example, fluorine, chlorine, preferably fluorine; hydroxyl groups; C 1 -C2 0 alkyl groups; C 1 -C2 0 alkoxyl groups; cyano groups; amino groups; nitro groups; aryl groups.
- halogen atoms such as, for example, fluorine, chlorine, preferably fluorine
- hydroxyl groups such as, for example, fluorine, chlorine, preferably fluorine
- C 1 -C2 0 alkyl groups C 1 -C2 0 alkoxyl groups
- cyano groups amino groups
- nitro groups aryl groups.
- cycloalkyl groups are: cyclopropyl, 1,4-dioxine, 2, 2-difluorocyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, methylcyclohexyl , methoxycyclohexyl , fluorocyclohexyl, phenylcyclohexyl .
- aryl groups means aromatic carbocyclic groups. Said aryl groups can be optionally substituted by one or more groups, equal to or different from each other, selected from: halogen atoms such as, for example, fluorine, chlorine, preferably fluorine; hydroxyl groups; C 1 -C2 0 alkyl groups; C 1 -C2 0 alkoxyl groups, cyano groups; amino groups; nitro groups; aryl groups.
- aryl groups are: phenyl, methylphenyl , trimethylphenyl , methoxyphenyl , hydroxyphenyl , phenyloxyphenyl , fluorophenyl, pentafluorophenyl , chlorophenyl , nitrophenyl, dimethylaminophenyl , naphthyl, phenylnaphthyl , phenanthrene , anthracene.
- C 1 -C20 alkoxyl groups refers to linear or branched alkoxyl groups having from 1 to 20 carbon atoms. Said alkoxyl groups can be optionally substituted with one or more groups, equal to or different from each other, selected from: halogen atoms such as, for example, fluorine, chlorine, preferably fluorine; hydroxyl groups; C1 -C20 alkyl groups; C 1 -C20 alkoxyl groups; cyano groups; amino groups; nitro groups.
- C1 -C20 alkoxyl groups are: methoxyl, ethoxyl, fluoroethoxyl, n-propoxyl, iso- propoxyl, n-butoxyl, n-fluoro-butoxyl , iso-butoxyl, t- butoxyl, pentoxyl, hexyloxyl, heptyloxyl, octyloxyl, nonyloxyl, decyloxyl, dodecyloxyl.
- cyclo or polycyclic system relates to a system containing one or more rings containing from 3 to 14 carbon atoms, optionally containing heteroatoms selected from nitrogen, oxygen, sulfur, silicon, selenium, phosphorous.
- Specific examples of the cyclo or polycyclic system are: thieno [3, 2-b] thiophene, thiadiazole, benzothiophene, quinoxaline, pyridine.
- Said compound having general formula (I) can be obtained according to processes known in the art.
- R lf R 2 , R3, R4, R5, R6 and R 7 have the same meanings indicated above,
- Rs is a linear or branched C 1 -C 10 alkyl group, preferably n-butyl
- X is a halogen atom such as, for example, chlorine, bromine, preferably bromine
- Pd(PPh3)2Cl2 is bis-
- the naphthothiadiazole compounds having general formula (II) can be obtained according to processes known in the art, for example, by halogenation of the corresponding naphthothiadiazole compounds. Further details relating to said processes can be found, for example, in "Journal of Heterocyclic Chemistry” (1968), Vol. 5, pages 295-297.
- the tri-alkyl-stannane compounds having general formula (III) can be obtained according to processes known in the art, for example, by reaction with n-butyl lithium or lithium di-iso-propylamide (LDA) with a tri- alkyltin chloride. Further details relating to said processes can be found, for example, in: "Macromolecules” (2006), Vol. 39, pages 2831-2834.
- LDA lithium di-iso-propylamide
- 2- [ tri ( n-butyl ) stannyl ] thiophene corresponding to a compound having general formula (III), wherein R 5 , ]3 ⁇ 4 and R 7 f are hydrogen atoms, and Rs is n-butyl, can be prepared as described, for example, in "Journal of the Chemical Society, Perkin Transaction” (1988), pages 2415-2421.
- a further object of the present invention also relates to the use of at least one disubstituted naphthothiadiazole compound having general formula (I) in the construction of luminescent solar concentrators (LSCs) .
- the naphthothiadiazole compound having general formula (I) can be used in said luminescent solar concentrator (LSC) in the following forms: dispersed in the polymer or in the glass, chemically bound to the polymer or glass, in solution, in gel form.
- the luminescent solar concentrator can contain, for example, a transparent matrix, wherein the term "transparent matrix” refers to any transparent material used in the form of a carrier, ligand, or a material in which at least one disubstituted naphthothiadiazole compound having general formula (I) is dispersed or englobed.
- the material used for the matrix is transparent, as such, to the radiations of interest and, in particular, to radiations having a frequency within the effective spectrum of the photovoltaic device (or solar device) such as, for example, the photovoltaic cell (or solar cell) in which it is used.
- Materials suitable for the aim of the present invention can therefore be selected from materials transparent at least to radiations having a wavelength ranging from 250 nm to 1100 nm.
- the transparent matrix that can be used for the aim of the present invention can be selected, for example, from polymeric or vitreous materials. Said matrix is characterized by a high transparency and by a high duration with respect to heat and light.
- Polymeric materials which can be advantageously used for the aim of the present invention are, for example, polymethylmethacrylate (PMMA) , epoxy resins, silicon resins, polyalkylene terephthalates , polycarbonates, polystyrene, polypropylene.
- Vitreous materials which can be advantageously used for the aim of the present invention are, for example, silicas.
- said at least one disubstituted naphthothiadiazole compound having general formula (I) can be dispersed in the polymer of said matrix by means, for example, of melt dispersion, and subsequent formation of a sheet comprising said polymer and said at least one disubstituted naphthothiadiazole compound having general formula (I), operating, for example, according to the technique known as casting.
- said at least one disubstituted naphthothiadiazole compound having general formula (I) and the polymer of said matrix can be solubilized in at least one solvent obtaining a solution which is deposited on a sheet of said polymer, forming a film comprising said at least one disubstituted naphthothiadiazole compound having general formula (I) and said polymer, operating, for example, with the use of a Doctor Blade-type film applicator: said solvent is subsequently left to evaporate .
- said at least one disubstituted naphthothiadiazole compound having general formula (I) can be solubilized in at least one solvent obtaining a solution which is deposited on a sheet of said matrix of the vitreous type, forming a film comprising said at least one disubstituted naphthothiadiazole compound having general formula (I), operating, for example, with the use of a Doctor Blade-type film applicator: said solvent is subsequently left to evaporate.
- a further object of the present invention also relates to a photovoltaic device (or solar device) selected, for example, from photovoltaic cells (or solar cells), photovoltaic modules (or solar modules), on both rigid and flexible supports, comprising a luminescent solar concentrator (LSC) including at least one disubstituted naphthothiadiazole compound having general formula (I) .
- a photovoltaic device selected, for example, from photovoltaic cells (or solar cells), photovoltaic modules (or solar modules), on both rigid and flexible supports, comprising a luminescent solar concentrator (LSC) including at least one disubstituted naphthothiadiazole compound having general formula (I) .
- LSC luminescent solar concentrator
- Said photovoltaic device (or solar device) can be obtained, for example, by assembling the above luminescent solar concentrator with a photovoltaic cell (or solar cell ) .
- the above solar concentrator can be produced in the form of a transparent sheet obtained through the solubilization of said at least one disubstituted naphthothiadiazole compound having general formula (I) and of the polymer of the matrix of the polymeric type, in at least one solvent, obtaining a solution which is deposited on a sheet of said polymer forming a film comprising said at least one disubstituted naphthothiadiazole compound having general formula (I) and said polymer, operating, for example, with the use of a Doctor Blade-type film applicator: said solvent is subsequently left to evaporate.
- said sheets can then be coupled with a photovoltaic cell (or solar cell) .
- the mixture obtained was immersed in a mixture of dichloromethane (CH 2 CI 2 ) (Aldrich) /saturated solution of sodium chloride (NaClg at .) (Aldrich) in a ratio of 1:10 (v/v) obtaining, after stirring, two phases: one prevalently organic and the other prevalently aqueous.
- the organic phase obtained was extracted three times with a saturated solution of sodium chloride (NaCl sat .) (Aldrich) to remove the dimethylsulfoxide (DMSO) : the aqueous phases obtained were joined and extracted twice with dichloromethane (CH 2 CI 2 ) (Aldrich) .
- the filtrate obtained was brought to dryness obtaining a solid residue which was dissolved in the minimum volume of dichloromethane (CH 2 CI 2 ) (Aldrich) and subsequently crystallized by means of a stream of nitrogen (N 2 ) saturated with n- pentane (Carlo Erba) .
- the crystals obtained were filtered at reduced pressure obtaining 1.02 g of red crystals of 4 , 9-bis ( thien-2 ' -yl ) -naphtho [ 2 , 3- c] [1, 2, 5] thiadiazole (DTN) (yield 100%).
- a photovoltaic cell IXYS-KXOB22-12 having a surface of 1.2 cm was then applied to one of the edges of the polymeric sheet.
- the main side of the polymeric sheet [that covered by the thin film containing 4 , 9-bis ( thien-2 ' -yl ) - naphtho [ 2 , 3-c] [ 1 , 2 , 5 ] thiadiazole (DTN)] was then illuminated with a light source having a power of 1 sun (1000 W/m 2 ) and the electric power generated by the effect of the illumination was measured.
- the power measurements (P) were carried out by illuminating a portion of sheet having dimensions of 100 mm x 90 mm, at an increasing distance (d) from the edge on which the photovoltaic cell was fixed. These measurements, at a variable distance from the photovoltaic cell, allow the contribution of optional waveguide, edge and self-absorption effects, to be quantified .
- Figure 1 shows the curve relating to the value of the power (P) generated, expressed in mW (indicated in ordinate), in relation to the distance (d) from the edge on which the photovoltaic cell was fixed, expressed in cm (indicated in abscissa) .
- a photovoltaic cell IXYS-KXOB22-12 having a surface of 1.2 cm was then applied to one of the edges of the polymeric sheet.
- the power measurements (P) were carried out by illuminating a portion of sheet having dimensions of 100 mm x 90 mm, at an increasing distance (d) from the edge on which the photovoltaic cell was fixed. These measurements, at a variable distance from the photovoltaic cell, allow the contribution of optional waveguide, edge and self-absorption effects, to be quantified .
- Figure 1 shows the curve relating to the value of the power (P) generated, expressed in mW (indicated in ordinate), in relation to the distance (d) from the edge on which the photovoltaic cell was fixed, expressed in cm (indicated in abscissa) .
Abstract
A luminescent solar concentrator (LSC) comprising at least one disubstituted naphthothiadiazole compound having general Formula (I) : wherein : - R1, R2, R3, R4, R5, R6 and R7, equal to or different from each other, represent a hydrogen atom; or they are selected from linear or branched C1 -C20, preferably C1 -C10, alkyl groups, optionally containing heteroatoms, cycloalkyl groups optionally substituted, aryl groups optionally substituted, linear or branched C1 -C20, preferably C1 -C10, alkoxyl groups, optionally substituted; - or R1 and R2 , can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; - or R2 and R3, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; - or R1 and R4, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; - or R5 and R6, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium; - or R6 and R7, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium.
Description
LUMINESCENT SOLAR CONCENTRATOR COMPRISING DISUBSTITUTED NAPHTHOTHIADIAZOLE COMPOUNDS
DESCRIPTION
The present invention relates to a luminescent solar concentrator (LSC) comprising at least one disubstituted naphthothiadiazole compound.
The present invention also relates to the use of at least one disubstituted naphthothiadiazole compound in the construction of luminescent solar concentrators (LSCs) .
The present invention also relates to a photovoltaic device (or solar device) selected, for example, from photovoltaic cells (or solar cells), photovoltaic modules (or solar modules), on both rigid and flexible supports, comprising a luminescent solar concentrator (LSC) including at least one disubstituted naphthothiadiazole compound.
It is known that single-junction photovoltaic cells (or solar cells) are not capable of efficiently exploiting all solar radiation. Their efficiency, in fact, is maximum only within a certain spectrum range which comprises a part of visible radiation and a part of infrared radiation.
Spectrum converter materials which can capture solar radiation outside the optimal spectral range and convert it to effective radiation, can be used for enhancing the performance of photovoltaic cells (or solar cells) . Furthermore, luminescent solar concentrators (LSCs) can be produced with these materials, which allow a further increase in the production of current in photovoltaic cells (or solar
cells ) .
Said luminescent solar concentrators (LSCs) generally consist of large sheets of material transparent to solar radiation, in which fluorescent substances are dispersed or chemically bound to said material, which act as spectrum converters. Due to the effect of the optical phenomenon of total reflection, the radiation emitted by the fluorescent molecules is "guided" towards the thin edges of the sheet wherein it is concentrated on photovoltaic cells (or solar cells) positioned therein. In this way, large surfaces of low- cost materials (photoluminescent sheets) can be used for concentrating the light on small surfaces of high- cost materials [photovoltaic cells (or solar cells) ] .
A fluorescent compound should have numerous characteristics for being advantageously used in the construction of luminescent solar concentrators (LSCs) and these are not always compatible with each other.
First of all, the frequency of the radiation emitted by fluorescence must correspond to an energy higher than the threshold value below which the semiconductor, representing the core of the photovoltaic cell, is no longer able to function.
Secondly, the absorption spectrum of the fluorescent compound should be as extensive as possible, so as to absorb most of the inciding solar radiation and then re-emit it at the desired frequency.
It is also desirable that the absorption of the solar radiation be extremely intense, so that the fluorescent compound can exert its function at the lowest possible concentrations, avoiding the use of large quantities.
Furthermore, the absorption process of solar radiation and its subsequent re-emission at lower frequencies, must take place with the highest possible efficiency, minimizing the so-called non-radiative losses, often collectively indicated with the term "thermalization" : the efficiency of the process is measured by its quantic yield.
Finally, the absorption and the emission frequencies must be as different as possible, as otherwise the radiation emitted by a molecule of the fluorescent compound would be absorbed, and at least partially diffused, by the adjacent molecules. Said phenomenon, generally called self-absorption, inevitably leads to a significant loss in efficiency. The difference between the frequencies of the peak with the lower frequency of the absorption spectrum and of the peak of the radiation emitted, is normally indicated as Stokes shift and measured in nm (i.e. it is not the difference between the two frequencies that is measured, but the difference between the two wavelengths which correspond to them) . High Stokes shifts are absolutely necessary for obtaining high efficiencies of luminescent solar concentrators (LSCs), bearing in mind the necessity, already mentioned, that the frequency of the radiation emitted corresponds to an energy higher than the threshold value below which the photovoltaic cell (or solar cell) is not able to function .
It is known that some benzothiadiazole compounds, in particular 4 , 7-di- ( thien-2 ' -yl ) -2 , 1 , 3-benzothia- diazole (DTB) , are fluorescent compounds which can be used in the construction of luminescent solar
concentrators (LSCs) . Compounds of this type are described in international patent application WO 2011/048458 in the name of the Applicant.
4, 7-di- (thien-2 '-yl) -2,1, 3-benzothiadiazole (DTB) is characterized by an emission centred around 579 nm, which corresponds to an energy well above the minimum threshold value for the functioning of photovoltaic cells (or solar cells), said threshold corresponding, for example, to a wavelength of about 1100 nm for the most widely-used photovoltaic cells (or solar cells), based on silicon. Furthermore, its absorption of light radiation is intense and extends over a relatively wide range of wavelengths, indicatively ranging from 550 nm (green radiation wavelength) to ultraviolet. Finally, 4 , 7-di- ( thien-2 ' -yl ) -2 , 1 , 3-benzothiadiazole (DTB) has a Stokes shift in dichloromethane solution, equal to 134 nm, well above that of most of the commercial products so far proposed for use in luminescent solar concentrators (LSCs).
For these reasons, the use of 4 , 7-di- ( thien-2 ' - yl ) -2 , 1 , 3-benzothiadiazole (DTB) has enabled the production of high-quality luminescent solar concentrators (LSCs).
Although 4, 7-di- (thien-2 '-yl) -2,1, 3-benzothiadi- azole (DTB) absorbs a significant part of the solar spectrum, however, it has a modest absorption in its higher wavelength regions, corresponding to yellow and red radiations which cannot therefore be converted into other radiations more effectively exploited by the photovoltaic cell (or solar cell) . For this reason, it is desirable to avail of fluorescent compounds having a wider absorption spectrum towards red.
The Applicant has therefore considered the problem of finding compounds having a wider absorption spectrum towards red, capable of minimizing the self-absorption phenomenon .
The Applicant has now found that disubstituted naphthothiadiazole compounds having a specific general formula (i.e. having general formula (I) indicated hereunder) can be advantageously used in the construction of luminescent solar concentrators (LSCs) . Said luminescent solar concentrators (LSCs) can be advantageously used in the construction of photovoltaic devices (or solar devices) such as, for example, photovoltaic cells (or solar cells), photovoltaic modules (or solar modules), on both rigid and flexible supports. Said disubstituted naphthothiadiazole compounds, in fact, have an absorption spectrum which extends much more towards red with respect to known benzothiadiazole compounds. Furthermore, said disubstituted naphthothiadiazole compounds have higher Stokes shifts than those of the known benzothiadiazole compounds .
An object of the present invention therefore relates to a luminescent solar concentrator (LSC) comprising at least one disubstituted naphthothiadiazole compound having general formula (I) :
Ri, R2, R3, R4, R5, R6 and R7, equal to or different from each other, represent a hydrogen atom; or they are selected from linear or branched Ci-C20f preferably C1-C10, alkyl groups, optionally containing heteroatoms, cycloalkyl groups optionally substituted, aryl groups optionally substituted, linear or branched Ci-C20f preferably C1-C10, alkoxyl groups, optionally substituted;
or Ri and R2, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
or R2 and R3, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
or Ri and R4, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon
atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
- or R5 and ]¾, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
- or R6 and R7f can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, preferably from 4 to 6 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as, for example, oxygen, sulfur, nitrogen, silicon, phosphorous, selenium.
According to a preferred embodiment of the present invention, in said general formula (I) the substituents Ri, R2, R3, R4, R5, R6 and R7, represent a hydrogen atom.
A particularly preferred aspect of the present invention therefore relates to a luminescent solar concentrator (LSC) comprising 4 , 9-bis- ( thien-2 ' -yl ) - naphtho [ 2 , 3-c] [ 1 , 2 , 5 ] -thiadiazole (DTN) having formula (la)
As mentioned above, the naphthothiadiazole compound having general formula (I), has an absorption which, with respect to that of 4 , 7-di- ( thien-2 ' -yl ) -2 , 1 , 3- benzothiadiazole (DTB) , extends much more towards red: said absorption is intense and extensive over a relatively wide wavelengths range which, for example, for 4 , 9-bis- ( thien-2 ' -yl ) -naphtho [ 2 , 3-c ] [ 1 , 2 , 5 ] -thia- diazole (DTN) having formula (la) ranges, from 200 nm to 600 nm. Furthermore, said compound having general formula (I) has a particularly high Stokes shift. 4,9- bis- (thien-2 '-yl) -naphtho [2, 3-c] [1,2,5] -thiadiazole (DTN) having formula (la), for example, has a Stokes shift, in dichloromethane solution, equal to 202 nm : therefore a Stokes shift higher than that, already high, of 4 , 7-di- ( thien-2 ' -yl ) -2 , 1 , 3-benzothiadiazole (DTB) equal to 134 nm (measured under the same conditions ) .
For the aim of the present description and of the following claims, the definitions of the numerical ranges always comprise the extremes unless otherwise specified .
For the aim of the present description and of the following claims, the term "comprising" also includes the terms "which essentially consists of" or "which consists of".
The term "C1-C20 alkyl groups" refers to linear or
branched alkyl groups having from 1 to 20 carbon atoms. Specific examples of C1 -C20 alkyl groups are: methyl, ethyl, Ώ-propyl, iso-propyl, n-butyl, iso-butyl, t- butyl, pentyl, ethyl-hexyl, hexyl, heptyl, octyl, nonyl, decyl, dodecyl .
The term " C 1 -C20 alkyl groups optionally containing heteroatoms" refers to linear or branched alkyl groups having from 1 to 20 carbon atoms, saturated or unsaturated, wherein at least one of the hydrogen atoms is substituted with a heteroatom selected from: halogens such as, for example, fluorine, chlorine, preferably fluorine; nitrogen; sulfur; oxygen. Specific examples of C1 -C20 alkyl groups optionally containing heteroatoms are: fluoromethyl, difluoromethyl, trifluoromethyl , trichloromethyl , 2 , 2 , 2-trifluoroethyl , 2,2, 2-trichloroethyl, 2,2,3, 3-tetrafluoropropyl,
2,2,3,3, 3-pentafluoropropyl, perfluoropentyl, perfluoroctyl , perfluorodecyl, oxymethyl, thiomethyl, thioethyl, dimethylamine , propylamine, dioctylamine .
The term "cycloalkyl groups" refers to cycloalkyl groups having from 3 to 10 carbon atoms. Said cycloalkyl groups can be optionally substituted with one or more groups, equal to or different from each other, selected from: halogen atoms such as, for example, fluorine, chlorine, preferably fluorine; hydroxyl groups; C 1 -C20 alkyl groups; C 1 -C20 alkoxyl groups; cyano groups; amino groups; nitro groups; aryl groups. Specific examples of cycloalkyl groups are: cyclopropyl, 1,4-dioxine, 2, 2-difluorocyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, methylcyclohexyl , methoxycyclohexyl , fluorocyclohexyl, phenylcyclohexyl .
The term "aryl groups" means aromatic carbocyclic
groups. Said aryl groups can be optionally substituted by one or more groups, equal to or different from each other, selected from: halogen atoms such as, for example, fluorine, chlorine, preferably fluorine; hydroxyl groups; C 1 -C20 alkyl groups; C 1 -C20 alkoxyl groups, cyano groups; amino groups; nitro groups; aryl groups. Specific examples of aryl groups are: phenyl, methylphenyl , trimethylphenyl , methoxyphenyl , hydroxyphenyl , phenyloxyphenyl , fluorophenyl, pentafluorophenyl , chlorophenyl , nitrophenyl, dimethylaminophenyl , naphthyl, phenylnaphthyl , phenanthrene , anthracene.
The term " C 1 -C20 alkoxyl groups" refers to linear or branched alkoxyl groups having from 1 to 20 carbon atoms. Said alkoxyl groups can be optionally substituted with one or more groups, equal to or different from each other, selected from: halogen atoms such as, for example, fluorine, chlorine, preferably fluorine; hydroxyl groups; C1 -C20 alkyl groups; C 1 -C20 alkoxyl groups; cyano groups; amino groups; nitro groups. Specific examples of C1 -C20 alkoxyl groups are: methoxyl, ethoxyl, fluoroethoxyl, n-propoxyl, iso- propoxyl, n-butoxyl, n-fluoro-butoxyl , iso-butoxyl, t- butoxyl, pentoxyl, hexyloxyl, heptyloxyl, octyloxyl, nonyloxyl, decyloxyl, dodecyloxyl.
The term "cyclo or polycyclic system" relates to a system containing one or more rings containing from 3 to 14 carbon atoms, optionally containing heteroatoms selected from nitrogen, oxygen, sulfur, silicon, selenium, phosphorous. Specific examples of the cyclo or polycyclic system are: thieno [3, 2-b] thiophene, thiadiazole, benzothiophene, quinoxaline, pyridine.
Said compound having general formula (I) can be obtained according to processes known in the art.
Said compound having general formula (I) can be obtained, for example, by means of a Stille reaction as indicated in the followin scheme:
wherein Rlf R2, R3, R4, R5, R6 and R7, have the same meanings indicated above, Rs is a linear or branched C1-C10 alkyl group, preferably n-butyl, X is a halogen atom such as, for example, chlorine, bromine, preferably bromine, Pd(PPh3)2Cl2 is bis-
( triphenylphosphine ) palladium (II) dichloride, DMSO is non-anhydrous dimethylsulfoxide .
The naphthothiadiazole compounds having general formula (II) can be obtained according to processes known in the art, for example, by halogenation of the corresponding naphthothiadiazole compounds. Further details relating to said processes can be found, for example, in "Journal of Heterocyclic Chemistry" (1968), Vol. 5, pages 295-297.
The tri-alkyl-stannane compounds having general formula (III) can be obtained according to processes known in the art, for example, by reaction with n-butyl lithium or lithium di-iso-propylamide (LDA) with a tri- alkyltin chloride. Further details relating to said processes can be found, for example, in: "Macromolecules" (2006), Vol. 39, pages 2831-2834.
In particular, 2- [ tri ( n-butyl ) stannyl ] thiophene corresponding to a compound having general formula (III), wherein R5 , ]¾ and R7 f are hydrogen atoms, and Rs is n-butyl, can be prepared as described, for example, in "Journal of the Chemical Society, Perkin Transaction" (1988), pages 2415-2421.
2- [ tri ( n-butyl ) stannyl ] thiophene can also be easily found on the market.
A further object of the present invention also relates to the use of at least one disubstituted naphthothiadiazole compound having general formula (I) in the construction of luminescent solar concentrators (LSCs) .
The naphthothiadiazole compound having general formula (I) can be used in said luminescent solar concentrator (LSC) in the following forms: dispersed in the polymer or in the glass, chemically bound to the polymer or glass, in solution, in gel form.
The luminescent solar concentrator (LSC) can contain, for example, a transparent matrix, wherein the term "transparent matrix" refers to any transparent material used in the form of a carrier, ligand, or a material in which at least one disubstituted naphthothiadiazole compound having general formula (I) is dispersed or englobed. The material used for the matrix is transparent, as such, to the radiations of interest and, in particular, to radiations having a frequency within the effective spectrum of the photovoltaic device (or solar device) such as, for example, the photovoltaic cell (or solar cell) in which it is used. Materials suitable for the aim of the present invention can therefore be selected from
materials transparent at least to radiations having a wavelength ranging from 250 nm to 1100 nm.
The transparent matrix that can be used for the aim of the present invention can be selected, for example, from polymeric or vitreous materials. Said matrix is characterized by a high transparency and by a high duration with respect to heat and light. Polymeric materials which can be advantageously used for the aim of the present invention are, for example, polymethylmethacrylate (PMMA) , epoxy resins, silicon resins, polyalkylene terephthalates , polycarbonates, polystyrene, polypropylene. Vitreous materials which can be advantageously used for the aim of the present invention are, for example, silicas.
If the matrix is of the polymeric type, said at least one disubstituted naphthothiadiazole compound having general formula (I) can be dispersed in the polymer of said matrix by means, for example, of melt dispersion, and subsequent formation of a sheet comprising said polymer and said at least one disubstituted naphthothiadiazole compound having general formula (I), operating, for example, according to the technique known as casting. Alternatively, said at least one disubstituted naphthothiadiazole compound having general formula (I) and the polymer of said matrix can be solubilized in at least one solvent obtaining a solution which is deposited on a sheet of said polymer, forming a film comprising said at least one disubstituted naphthothiadiazole compound having general formula (I) and said polymer, operating, for example, with the use of a Doctor Blade-type film applicator: said solvent is subsequently left to
evaporate .
If the matrix is of the vitreous type, said at least one disubstituted naphthothiadiazole compound having general formula (I) can be solubilized in at least one solvent obtaining a solution which is deposited on a sheet of said matrix of the vitreous type, forming a film comprising said at least one disubstituted naphthothiadiazole compound having general formula (I), operating, for example, with the use of a Doctor Blade-type film applicator: said solvent is subsequently left to evaporate.
A further object of the present invention also relates to a photovoltaic device (or solar device) selected, for example, from photovoltaic cells (or solar cells), photovoltaic modules (or solar modules), on both rigid and flexible supports, comprising a luminescent solar concentrator (LSC) including at least one disubstituted naphthothiadiazole compound having general formula (I) .
Said photovoltaic device (or solar device) can be obtained, for example, by assembling the above luminescent solar concentrator with a photovoltaic cell (or solar cell ) .
According to a preferred embodiment of the present invention, the above solar concentrator can be produced in the form of a transparent sheet obtained through the solubilization of said at least one disubstituted naphthothiadiazole compound having general formula (I) and of the polymer of the matrix of the polymeric type, in at least one solvent, obtaining a solution which is deposited on a sheet of said polymer forming a film comprising said at least one disubstituted
naphthothiadiazole compound having general formula (I) and said polymer, operating, for example, with the use of a Doctor Blade-type film applicator: said solvent is subsequently left to evaporate. In said photovoltaic devices (or solar devices), said sheets can then be coupled with a photovoltaic cell (or solar cell) .
Some illustrative and non-limiting examples are provided hereunder for a better understanding of the present invention and for its embodiment.
4, 7-di- (thien-2 '-yl) -2,1, 3-benzothiadiazole (DTB) was obtained as described in patent application MI2010A001316 in the name of the Applicant, whose content is incorporated herein as reference.
EXAMPLE 1
Synthesis of 4 , 9-bis (thien-2 '-yl) -naphtho [2,3- c] [ 1 , 2 , 5 ] thiadiazole (DTN) (having formula (la)
4 , 9-bis (thien-2 '-yl) -naphtho [2,3-c] [1,2,5] thiadiazole (DTN) was obtained operating according to the following scheme:
(IIa> '
1.0 g (2.9 mmoles) of 4,9-dibromo-
[2,1,3] [ 1 , 2 , 5 ] naphthothiadiazole having formula (Ha) (Santai Labs), 50.5 mg (0.072 mmol, 2,5%moi/moi ) of bis ( triphenylphosphine ) palladium (II) dichloride [Pd (PPh3) 2C12] (Aldrich) , 2 ml (7.4 mmoles, 2.55 eq) of 2- [ tri ( Ώ-butyl ) stannyl ] thiophene having formula (Ilia) (Aldrich) and 45 ml of non-anhydrous dimethylsulfoxide
(DMSO) (Acros Organics), were charged into a 100 ml 3- necked flask, equipped with magnetic stirring, thermometer and cooler: the reaction mixture obtained was heated to 70°C, for 5 hours, in the presence of a light stream of nitrogen (N2) .
The advance degree of the reaction was controlled by means of gas-chromatographic analysis which, at the end of the same, indicated the formation of 4,9- bis (thien-2 '-yl) -naphtho [2, 3-c] [ 1 , 2 , 5 ] thiadiazole (DTN) (yield 100%) .
At the end of the reaction, the mixture obtained was immersed in a mixture of dichloromethane (CH2CI2) (Aldrich) /saturated solution of sodium chloride (NaClgat.) (Aldrich) in a ratio of 1:10 (v/v) obtaining, after stirring, two phases: one prevalently organic and the other prevalently aqueous. The organic phase obtained was extracted three times with a saturated solution of sodium chloride (NaClsat.) (Aldrich) to remove the dimethylsulfoxide (DMSO) : the aqueous phases obtained were joined and extracted twice with dichloromethane (CH2CI2) (Aldrich) . The organic phases obtained in the various steps indicated above were joined, dried on calcium chloride (CaCl2) (Aldrich) for 3 hours and subsequently subjected to filtration by means of a vacuum pump. The solvent was then removed in a rotating evaporator whereas the optional residual traces of dimethylsulfoxide (DMSO) were removed, maintaining the residue obtained after evaporation under a stream of nitrogen (N2) .
The residue obtained was subsequently dissolved in the minimum volume of dichloromethane (CH2CI2) (Aldrich) and the resulting solution was deposited on a silica
panel (S1O2) (Carlo Erba) and filtered using a mixture of ethyl acetate (Aldrich) /n-heptane (Aldrich) in a ratio of 1:10 (v/v) . The filtrate obtained was brought to dryness obtaining a solid residue which was dissolved in the minimum volume of dichloromethane (CH2CI2) (Aldrich) and subsequently crystallized by means of a stream of nitrogen (N2) saturated with n- pentane (Carlo Erba) . The crystals obtained were filtered at reduced pressure obtaining 1.02 g of red crystals of 4 , 9-bis ( thien-2 ' -yl ) -naphtho [ 2 , 3- c] [1, 2, 5] thiadiazole (DTN) (yield 100%).
EXAMPLE 2
6 g of polymethylmethacrylate Altuglas VSUVT 100 (PMMA) and 84.1 mg of 4 , 9-bis ( thien-2 ' -yl ) -naphtho [ 2 , 3- c] [ 1 , 2 , 5 ] thiadiazole (DTN) obtained as described in Example 1, were dissolved in 30 ml of 1,2- dichlorobenzene (Aldrich) . The solution obtained was then uniformly deposited on a sheet of polymethylmethacrylate Altuglas VSUVT 100 (PMMA) (dimensions 300 mm x 90 mm x 6 mm) ) using a Doctor Blade-type film applicator and the solvent was left to evaporate at room temperature (25°C), in a light stream of air, for 24 hours. A red-coloured transparent sheet was obtained (sheet 1), the colour being conferred by the film, whose thickness proved to range from 50 μπι to 100 μπι.
A photovoltaic cell IXYS-KXOB22-12 , having a surface of 1.2 cm was then applied to one of the edges of the polymeric sheet.
The main side of the polymeric sheet [that covered by the thin film containing 4 , 9-bis ( thien-2 ' -yl ) - naphtho [ 2 , 3-c] [ 1 , 2 , 5 ] thiadiazole (DTN)] was then
illuminated with a light source having a power of 1 sun (1000 W/m2) and the electric power generated by the effect of the illumination was measured.
The power measurements (P) were carried out by illuminating a portion of sheet having dimensions of 100 mm x 90 mm, at an increasing distance (d) from the edge on which the photovoltaic cell was fixed. These measurements, at a variable distance from the photovoltaic cell, allow the contribution of optional waveguide, edge and self-absorption effects, to be quantified .
Figure 1 shows the curve relating to the value of the power (P) generated, expressed in mW (indicated in ordinate), in relation to the distance (d) from the edge on which the photovoltaic cell was fixed, expressed in cm (indicated in abscissa) .
It can be seen that, in the absence of edge effects, the average power generated is equal to 8.86 mW (Figure 1 ) .
EXAMPLE 3 (comparative)
6 g of polymethylmethacrylate Altuglas VSUVT 100 (PMMA) and 49.5 mg of 4 , 7-di- ( thien-2 ' -yl ) -2 , 1 , 3- benzothiadiazole (DTB) , were dissolved in 30 ml of 1,2- dichlorobenzene (Aldrich) . The solution obtained was then uniformly deposited on a sheet of polymethylmethacrylate Altuglas VSUVT 100 (PMMA) (dimensions 300 mm x 90 mm x 6 mm) ) using a Doctor Blade-type film applicator and the solvent was left to evaporate at room temperature (25°C), in a light stream of air, for 24 hours. A yellow-coloured transparent sheet was obtained (sheet 2), the colour being conferred by the film, whose thickness proved to range
from 50 μπι to 100 μπι.
A photovoltaic cell IXYS-KXOB22-12 , having a surface of 1.2 cm was then applied to one of the edges of the polymeric sheet.
The power measurements (P) were carried out by illuminating a portion of sheet having dimensions of 100 mm x 90 mm, at an increasing distance (d) from the edge on which the photovoltaic cell was fixed. These measurements, at a variable distance from the photovoltaic cell, allow the contribution of optional waveguide, edge and self-absorption effects, to be quantified .
Figure 1 shows the curve relating to the value of the power (P) generated, expressed in mW (indicated in ordinate), in relation to the distance (d) from the edge on which the photovoltaic cell was fixed, expressed in cm (indicated in abscissa) .
It can be seen that, in the absence of edge effects, the average power generated is equal to 5.01 mW (Figure 1), consequently lower than that generated using 4 , 9-bis ( thien-2 ' -yl ) -naphtho [ 2 , 3-c ] [1,2,5]- thiadiazole (DTN) (Example 2) according to the present invention .
Claims
A luminescent solar concentrator (LSC) comprising at least one disubstituted naphthothiadiazole compound having general formula (I) :
Ri, R-2, R3, 4, R5, R6 and R7, the same or different, represent a hydrogen atom; or they are selected from linear or branched C1-C20 alkyl groups, optionally containing heteroatoms, cycloalkyl groups optionally substituted, aryl groups optionally substituted, linear or branched C1-C20 alkoxyl groups, optionally substituted;
or Ri and R2, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
or R2 and R3, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a
polycyclic system containing from 3 to 14 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
- or Ri and R4, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
- or R5 and R6, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
- or R6 and R7f can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as oxygen, sulfur, nitrogen, silicon, phosphorous, selenium.
2. The luminescent solar concentrator (LSC) according to claim 1, wherein in said general formula (I), the substituents Ri, R2, R3, R4, R5, R6 and R7,
represent a hydrogen atom.
The luminescent solar concentrator (LSC) according to claim 1 or 2, wherein said disubstituted naphthothiadiazole compound having general formula (I) is 4, 9-bis- (thien-2 '-yl) -naphtho [2, 3-c] [1, 2, 5] - thiadiazole (DTN) having formula (la) :
Use of at least one disubstituted naphthothiadiazole compound having general formula (I) :
- Ri, R-2, R-3, R-4, R-5, R-6 and R7, the same or different, represent a hydrogen atom; or they are selected from linear or branched C1-C20 alkyl groups, optionally containing heteroatoms, cycloalkyl groups optionally substituted, aryl groups optionally substituted, linear or branched C1-C20 alkoxyl groups, optionally substituted;
or Ri and R2, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
or R2 and R3, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
or Ri and R4, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
or R5 and R6, can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as oxygen, sulfur, nitrogen, silicon, phosphorous, selenium;
- or R6 and R7f can be optionally bound to each other so as to form, together with the carbon atoms to which they are bound, a cycle or a polycyclic system containing from 3 to 14 carbon atoms, saturated, unsaturated, or aromatic, optionally containing one or more heteroatoms such as oxygen, sulfur, nitrogen, silicon, phosphorous, selenium,
in the construction of luminescent solar concentrators (LSCs).
Use according to claim 4, wherein in said general formula (I), the substituents Ri, R2, R3, R4, R5, R6 and R7, represent a hydrogen atom.
Use according to claim 4 or 5, wherein said disubstituted naphthothiadiazole compound having general formula (I) is 4 , 9-bis- ( thien-2 ' -yl ) - naphtho [ 2 , 3-c] [ 1 , 2 , 5 ] -thiadiazole (DTN) having formula ( la) :
A photovoltaic device (or solar device) selected from photovoltaic cells (or solar cells), photovoltaic modules (or solar modules), on both a rigid and a flexible support, comprising a luminescent solar concentrator (LSC) including at least one disubstituted naphthothiadiazole compound having general formula (I), according to any of the claims from 1 to 3.
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WO2011048458A1 (en) | 2009-10-19 | 2011-04-28 | Eni S.P.A. | Photoluminescent compositions for spectrum converters with enhanced efficiency |
WO2011072876A1 (en) * | 2009-12-18 | 2011-06-23 | Eni S.P.A. | Copolymers for solar cells based on acridonic units |
WO2013005177A2 (en) * | 2011-07-07 | 2013-01-10 | Eni S.P.A. | Luminescent solar concentrator comprising disubstituted benzoselenadiazole compounds |
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WO2011048458A1 (en) | 2009-10-19 | 2011-04-28 | Eni S.P.A. | Photoluminescent compositions for spectrum converters with enhanced efficiency |
WO2011072876A1 (en) * | 2009-12-18 | 2011-06-23 | Eni S.P.A. | Copolymers for solar cells based on acridonic units |
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