Synthesis and Photovoltaic Properties of a Low Band Gap Polymer for Organic Solar Cell
- Authors
- Woo, Yong-Ho; Lee, Hyo-Sang; Park, Sungnam; Choi, E-Joon; Kim, BongSoo
- Issue Date
- 1월-2015
- Publisher
- POLYMER SOC KOREA
- Keywords
- organic solar cell; low band gap; Stille coupling reaction; alternating copolymer
- Citation
- POLYMER-KOREA, v.39, no.1, pp.71 - 77
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- POLYMER-KOREA
- Volume
- 39
- Number
- 1
- Start Page
- 71
- End Page
- 77
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/94777
- DOI
- 10.7317/pk.2015.39.1.71
- ISSN
- 0379-153X
- Abstract
- We synthesized a low band gap alternating copolymer containing electron-rich units (i.e. dithienosiloles and benzodithiophenes) and electron-deficient units (i.e. difluorobenzothiadiazoles) for high performance organic solar cells. The polymer was prepared by the Stille coupling reaction and characterized using H-1 NMR, GPC, TGA, UV-visible absorption spectroscopy, and cyclic voltammetry. Solar cells were fabricated in a structure of ITO/PEDOT:PSS/polymer:PC70BM/Al with five different blending ratios of polymer and PC70BM (1:1.5, 1:2, 1:3, 1:3.5 and 1:4 by weight ratio). The best efficiency was achieved from the 1:3 ratio of polymer and PC70BM in the photoactive layer, and TEM revealed that there is an optimal nanoscale phase separation between polymer and PC70BM in the 1:3 ratio blend film.
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Collections - College of Science > Department of Chemistry > 1. Journal Articles
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