TY - JOUR
T1 - Regioselectivity control of block copolymers for high-performance single-material organic solar cells
AU - Li, Siying
AU - Li, Bin
AU - Yang, Xue
AU - Wei, Huan
AU - Wu, Ziang
AU - Li, Yuxiang
AU - Hu, Yuanyuan
AU - Woo, Han Young
AU - Yuan, Jianyu
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (52073198), Science Foundation of Jiangsu Province (BK20211598), Science and Technology Program of Shanxi Province (No 2022JM-229), “111” project, the China Postdoctoral Science Foundation (Grant No 2021T140495), the Young Elite Scientist Sponsorship Program by CAST, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University.
Publisher Copyright:
© 2022 The Royal Society of Chemistry
PY - 2022/5/23
Y1 - 2022/5/23
N2 - 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-γ, 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-γ due to different regioselectivity within the polymer backbone. Specifically, PBDB-T-b-PTY6-γ 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 (Jsc) 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.
AB - 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-γ, 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-γ due to different regioselectivity within the polymer backbone. Specifically, PBDB-T-b-PTY6-γ 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 (Jsc) 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.
UR - http://www.scopus.com/inward/record.url?scp=85131799983&partnerID=8YFLogxK
U2 - 10.1039/d2ta02307e
DO - 10.1039/d2ta02307e
M3 - Article
AN - SCOPUS:85131799983
SN - 2050-7488
VL - 10
SP - 12997
EP - 13004
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 24
ER -
