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High-Efficiency Organic Photovoltaics with Two-Dimensional Conjugated Benzodithiophene-Based Regioregular Polymers

High-Efficiency Organic Photovoltaics with Two-Dimensional Conjugated Benzodithiophene-Based Regioregular Polymers
Kim, HonggiLim, BogyuHeo, HyojungNam, GeonikLee, HyungjinLee, Ji YoungLee, JaecholLee, Youngu
DGIST Authors
Kim, HonggiHeo, HyojungNam, GeonikLee, HyungjinLee, Youngu
Issued Date
Article Type
Bulk HeterojunctionConjugated PolymersDevicesDonor Acceptor PolymersEfficiencyElectron Accepting UnitsElectron DonatingHeterojunction Solar CellsHeterojunctionsHigh MobilityHigh Power ConversionMicrolensesOpen Circuit VoltageOpen Circuit VoltageOrganic Photovoltaic (OPV) DevicesOrganic Photovoltaics (OPV)Organic PolymersOrientationchainsOut of Plane DirectionPerformancePolymersPower Conversion EfficiencySemiconducting PolymersSmall MoleculesThieno[3,4 B]ThiopheneThiophene
We synthesized and characterized two kinds of regioregular polymers that were based on thieno[3,4-b]thiophene as an electron-accepting unit and benzo[1,2-b:4,5-b′]dithiophene as the electron-donating unit with different side chain, alkylthio and alkyl thiophenes, named rr-PTBS and rr-PTB7-Th, respectively. Because of the partial introduction of the alkylthio thiophene side chain, rr-PTBS showed red-shifted absorption and a deeper HOMO level compared to those of rr-PTB7-Th. In addition, both rr-PTBS:PC71BM and rr-PTB7-Th:PC71BM blended films showed face-on orientations stronger than those of regiorandom PTB7-Th. However, the rr-PTB7-Th:PC71BM blended film showed a peak in the out-of-plane direction much weaker than those of rr-PTBS:PC71BM and PTB7-Th:PC71BM blended films. Moreover, the rr-PTBS:PC71BM blended film exhibited charge carrier mobility (μe/μh ∼ 1.01) much more balanced than that of the rr-PTB7-Th:PC71BM blended film (μe/μh ∼ 1.23). The bulk-heterojunction organic photovoltaic (OPV) device based on rr-PTBS and the 1,8-diiodooctane additive showed a high power conversion efficiency (PCE) of 8.68%, while the OPV device based on rr-PTB7-Th and the 1,8-diiodooctane additive showed a PCE of 7.04%. Finally, an OPV device using rr-PTBS, the diphenyl ether additive, and Micro Lens Film exhibited a short-circuit current (Jsc) of 19.72 mA/cm2, an open-circuit voltage (Voc) of 0.82 V, and a fill factor (FF) of 63.82%, thus resulting in a PCE of 10.31%. © 2017 American Chemical Society.
American Chemical Society
Related Researcher
  • 이윤구 Lee, Youngu 에너지공학과
  • Research Interests OTF Solar cell; OLED; Printed Electronics; 유기박막형 태양전지
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Department of Energy Science and Engineering Organic & Printed Electronics Laboratory(OPEL) 1. Journal Articles


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