Highly Efficient All-Polymer Solar Cells Enabled by Random Ternary Copolymer Acceptors with High Tolerance on Molar Ratios

作者:Wu, Y (Wu, Yao)[ 1 ] ; Wu, Q (Wu, Qiang)[ 1 ] ; Wang, W (Wang, Wei)[ 1 ] ; Sun, R (Sun, Rui)[ 1 ] ; Min, J (Min, Jie)[ 1,2,3 ]

SOLAR RRL

卷: 4 期: 11

文献号: 2000409

DOI: 10.1002/solr.202000409

出版年:NOV 2020

在线发表日期: SEP 2020

文献类型:Article

摘要

Finding effective molecular design strategies and fine tuning the molar ratios of donor/acceptor (D/A) random copolymers to optimize the blend microstructure of the photoactive layer is one of the main long-standing challenges in developing and fabricating highly efficient all-polymer solar cells (all-PSCs). Herein, a random ternary copolymerization strategy to develop four random copolymer acceptors PYEx(x = 10, 20, 30, 40) is used by polymerizing a fused-ring A-D-A-type acceptor unit modified from Y5 with a thiophene-connecting unit and a controlled amount of an ester-substituted thiophene (EST) unit. Compared with PYT (PYE0) of only Y5-like units and thiophene units, the ternary copolymers PYExshow slightly down-shifted lowest unoccupied molecular orbital (LUMO) energy levels, reduced absorption coefficients, and decreased electron mobilities. However, it is also demonstrated that this design approach rationally modifies the molecular aggregations of polymer acceptors, effectively fine tuning the blend morphology and physical mechanisms, and enhances the device performance of the PYEx-based all-PSCs. Among them, blends of PYE20 with donor polymer PBDB-T combine 13.6% power conversion efficiency (PCE). Of particular note is that all of the PYEx-based devices exhibit the best PCEs of over 13%, indicating the high tolerance on molar ratios.

关键词

作者关键词:all-polymer solar cells; device efficiencies; nonfullerene acceptors; polymer acceptors; random polymerizations

KeyWords Plus:POWER CONVERSION EFFICIENCY; ELECTRON-ACCEPTOR; BENZODITHIOPHENE; CRYSTALLINITY; AGGREGATION; ABSORPTION; MORPHOLOGY

作者信息

通讯作者地址:

Wuhan University Wuhan Univ, Inst Adv Studies, Wuhan 430072, Peoples R China.

Chinese Academy of Sciences Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China.

Zhengzhou University Zhengzhou Univ, Minist Educ, Key Lab Mat Proc & Mold, Zhengzhou 450002, Peoples R China.

通讯作者地址: Min, J (通讯作者)

Wuhan Univ, Inst Adv Studies, Wuhan 430072, Peoples R China.

通讯作者地址: Min, J (通讯作者)

Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China.

通讯作者地址: Min, J (通讯作者)

Zhengzhou Univ, Minist Educ, Key Lab Mat Proc & Mold, Zhengzhou 450002, Peoples R China.

地址:

[ 1 ]‎ Wuhan Univ, Inst Adv Studies, Wuhan 430072, Peoples R China

[ 2 ]‎ Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China

[ 3 ]‎ Zhengzhou Univ, Minist Educ, Key Lab Mat Proc & Mold, Zhengzhou 450002, Peoples R China

电子邮件地址:min.jie@whu.edu.cn