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Regioselectivity control of block copolymers for high-performance single-material organic solar cells

Authors
Li, SiyingLi, BinYang, XueWei, HuanWu, ZiangLi, YuxiangHu, YuanyuanWoo, Han YoungYuan, Jianyu
Issue Date
21-6월-2022
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.10, no.24, pp.12997 - 13004
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MATERIALS CHEMISTRY A
Volume
10
Number
24
Start Page
12997
End Page
13004
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/142950
DOI
10.1039/d2ta02307e
ISSN
2050-7488
Abstract
Narrow bandgap (NBG) block copolymers are promising materials to realize single-material organic solar cells (SMOSCs) that combine high performance with minimized fabrication procedures. Quite recently, the exploitation of polymerized small molecule acceptors (PSMAs) capable of harvesting infrared photons, in conjunction with visible-light absorbing donor polymers, has been demonstrated as an effective route to design efficient NBG block copolymers. In this work, two NBG copolymers, namely PBDB-T-b-PTY6 and PBDB-T-b-PTY6-gamma, were designed and synthesized. By precisely controlling the regiospecificity of the PSMA segment, regioregularity has been successfully achieved over the block copolymer backbone. There are evident differences between the properties of PBDB-T-b-PTY6 and PBDB-T-b-PTY6-gamma due to different regioselectivity within the polymer backbone. Specifically, PBDB-T-b-PTY6-gamma exhibits increased light absorbance, dominant electron transport properties, and a more ordered solid film structure. Moreover, the regioregular block polymer exhibits an increased short-circuit current density (J(sc)) approaching 20 mA cm(-2), resulting in an improved power conversion efficiency (PCE) of 10.51% in solar cells, which is among the highest reported for SMOSCs, indicating the important role of regioselectivity in determining block copolymer properties.
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