Polymer solar cells fabricated with 4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4,5-b '] dithiophene and alkyl-substituted thiophene-3-carboxylate-containing conjugated polymers: Effect of alkyl side-chain in thiophene-3-carboxylate monomer on the device performance
- Authors
- Cho, Min Ju; Seo, Jangwon; Luo, Kai; Kim, Kyung Hwan; Choi, Dong Hoon; Prasad, Paras N.
- Issue Date
- 17-8월-2012
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Bulk heterojunction; Copolymerization; PCBM
- Citation
- POLYMER, v.53, no.18, pp.3835 - 3841
- Indexed
- SCIE
SCOPUS
- Journal Title
- POLYMER
- Volume
- 53
- Number
- 18
- Start Page
- 3835
- End Page
- 3841
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/107692
- DOI
- 10.1016/j.polymer.2012.07.007
- ISSN
- 0032-3861
- Abstract
- Four alkyl-substituted thiophene-3-carboxylate containing donor-acceptor (D-A) copolymers were designed, synthesized, and characterized. Thiophene-3-carboxylate was used as a weak electron acceptor unit in the copolymers to provide a deeper highest occupied molecular orbital (HOMO) level for obtaining a higher open-circuit voltage in polymer solar cells (PSCs). The resulting bulk heterojunction PSCs, made of the copolymers and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM), exhibited different short circuit currents (J(SC)s) and open-circuit voltages (V(OC)s), depending on the length of alkyl side-chain in the thiophene-3-carboxylate unit. Among all fabricated photovoltaic (PV) devices, PC2:PC71BM (1:1 wt. ratio) showed the highest efficiency with the highest Jsc of 10.5 mA/cm(2). Although PC5:PC71BM (1:1) displayed the highest V-OC of 0.93 V. the device efficiency was observed to be poor, which is due to poor nanophase segregation. This comparison shows that the side-chain of thiophene carboxylate in these copolymers plays a very important role in the device efficiency. (C) 2012 Elsevier Ltd. All rights reserved.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Science > Department of Chemistry > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.