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

Title
High-Efficiency Organic Photovoltaics with Two-Dimensional Conjugated Benzodithiophene-Based Regioregular Polymers
Authors
Kim, HonggiLim, BogyuHeo, HyojungNam, GeonikLee, HyungjinLee, Ji YoungLee, JaecholLee, Youngu
DGIST Authors
Kim, Honggi; Heo, Hyojung; Nam, Geonik; Lee, Hyungjin; Lee, Youngu
Issue Date
2017-05-23
Citation
Chemistry of Materials, 29(10), 4301-4310
Type
Article
Article Type
Article
Keywords
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
ISSN
0897-4756
Abstract
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.
URI
http://hdl.handle.net/20.500.11750/4171
DOI
10.1021/acs.chemmater.7b00595
Publisher
American Chemical Society
Related Researcher
  • Author Lee, Youn Gu Organic & Printed Electronics Laboratory(OPEL)
  • Research Interests OTF Solar cell; OLED; Printed Electronics; 유기박막형 태양전지; OLED; Printed Electronics
Files:
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Collection:
Energy Science and EngineeringETC1. Journal Articles
Energy Science and EngineeringOrganic & Printed Electronics Laboratory(OPEL)1. Journal Articles


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