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- Title
Syntheses of Biaxially Extended Octithiophene-Based Conjugated Copolymers for High-Open-Circuit-Voltage Photovoltaic-Cell Applications.
- Authors
Wu, Hung ‐ Chin; Lai, Yi ‐ Cang; Chiu, Yu ‐ Cheng; Lee, Wen ‐ Ya; Chen, Wen ‐ Chang
- Abstract
Novel biaxially extended octithiophene (8T)-based conjugated polymers are successfully synthesized using Stille coupling reactions of the branched octithiophene moiety with selenophene (P8TSe), thiophene (P8TT), and thieno[3,2-b]thiophene (P8TTT). The 8T moiety can significantly lower the highest occupied molecular orbital (HOMO) level and leads to an enhanced open-circuit voltage because of the branched conformation. The power conversion efficiencies (PCE) of the polymer/[6,6]-phenyl-C71-butyric acid methyl ester PC71BM photovoltaic cells are in the range of 1.28-2.30%. In particular, the P8TTT-based device processed from an o-dichlorobenzene/1,8-diiodoctane mixed solvent shows the best PCE among the studied polymers (2.81%), demonstrating that 8T-based polymers with a low HOMO level can emerge as promising candidates for organic device applications.
- Subjects
COPOLYMERS; CONJUGATED polymers; SULFUR compounds; PHOTOVOLTAIC cells; MOLECULAR orbitals
- Publication
Macromolecular Chemistry & Physics, 2014, Vol 215, Issue 7, p638
- ISSN
1022-1352
- Publication type
Article
- DOI
10.1002/macp.201300765