The effect of side-chain structure on copolymer-based bulk heterojunction solar cells

• Main Authors: Khantha C., Kruefu V., Coffin R.C., Carroll D.L., Phanichphant S.
• Format: Conference or Workshop Item
• Language: English
• Published: 2014
• Online Access: http://www.scopus.com/inward/record.url?eid=2-s2.0-84884515693&partnerID=40&md5=d6d4ad8001d3382886b9786bc1d1b0a8; http://cmuir.cmu.ac.th/handle/6653943832/7212
• Institution: Chiang Mai University

This paper describes the synthesis and photovoltaic studies of copolymer based on benzo[1,2-b:4,5-b-]dithiophene and 2,1,3-benzothiadiazole. Bulk-heterojunction solar cells were fabricated by using chlorobenzene, and 2% chloronapthalene as a solvent additive in chlorobenzene. The copolymers as the electron donor were blended with [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) as the electron acceptor. The effect of side-chain on BDT was compared between 4,8-bis(1-pentylhexyl)benzo[1,2-b: 4,5-b-]dithiophene (C11BDT) and 4,8-bis(1-butylhexyl)benzo[1,2-b:4,5-b-]dithioph ene (C9BDT). The power conversion efficiency (PCE) was improved with the shorter side-chain. The highest PCE was found in PC9BDTBT with 2.29%. Copyright © Taylor & Francis Group, LLC.