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- Title
Dithieno[3,2- b:2′,3′- d]pyrrole and Benzothiadiazole-Based Semicrystalline Copolymer for Photovoltaic Devices with Indene-C<sub>60</sub> Bisadduct.
- Authors
Lee, Wonho; Kim, Gi‐Hwan; Jeong, Eunjae; Wang, Xiaowei; Yum, Seungjib; Ko, Seo‐Jin; Hwang, Sungu; Kim, Jin Young; Woo, Han Young
- Abstract
A semicrystalline low-bandgap polymer (PDTPBT) based on alternating dithienopyrrole and benzothiadiazole moieties as a pair of the indene-C60 bisadduct (ICBA) for polymeric solar cells is reported. The lowest unoccupied molecular orbital (LUMO) level of PDTPBT is measured to be −3.47 eV, ensuring sufficient energy offset for photoinduced charge transfer to ICBA. Photovoltaic cells are fabricated with ICBA and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) as an acceptor. By replacing PC71BM with ICBA, the open-circuit voltage is increased by 0.23 V and the resulting power conversion efficiency is improved from 1.17% to 1.71%. To optimize the ICBA-based devices, crystalline low-bandgap structures should be designed carefully as a pair of ICBA by considering the energy-level offset for charge separation and crystalline interchain ordering, for minimizing the intercalated ICBAs inside the polymer domain.
- Subjects
ORGANONITROGEN compounds; CELLS; PHOTOVOLTAIC cells; CHARGE transfer; SOLAR cells
- Publication
Macromolecular Chemistry & Physics, 2013, Vol 214, Issue 18, p2083
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201300303