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Synthesis and Photovoltaic Properties of a Low Band Gap Polymer for Organic Solar Cell

Title
Synthesis and Photovoltaic Properties of a Low Band Gap Polymer for Organic Solar Cell
Authors
Woo, Yong-HoLee, Hyo-SangPark, SungnamChoi, E-JoonKim, BongSoo
Ewha Authors
김봉수
SCOPUS Author ID
김봉수scopus
Issue Date
2015
Journal Title
POLYMER-KOREA
ISSN
0379-153XJCR Link
Citation
POLYMER-KOREA vol. 39, no. 1, pp. 71 - 77
Keywords
organic solar celllow band gapStille coupling reactionalternating copolymer
Publisher
POLYMER SOC KOREA
Indexed
SCIE; SCOPUS; KCI WOS
Document Type
Article
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.
DOI
10.7317/pk.2015.39.1.71
Appears in Collections:
사범대학 > 과학교육과 > Journal papers
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