Wide Bandgap Copolymers Based on Quinoxalino[6,5-f]quinoxaline for Highly Efficient Nonfullerene Polymer Solar Cells

被引：86

作者：

Yu, Ting ^{[1
,2
]}

Xu, Xiaopeng ^{[1
,2
]}

Zhang, Guangjun ^{[1
,2
]}

Wan, Jiahui ^{[1
,2
]}

Li, Ying ^{[1
,2
]}

Peng, Qiang ^{[1
,2
]}

机构：

[1] Sichuan Univ, Key Lab Green Chem & Technol, Coll Chem, Minist Educ, Chengdu 610064, Sichuan, Peoples R China

[2] Sichuan Univ, State Key Lab Polymer Mat Engn, Chengdu 610064, Sichuan, Peoples R China

来源：

ADVANCED FUNCTIONAL MATERIALS | 2017年 / 27卷 / 28期

关键词：

benzodithiophene; nonfullerene polymer solar cells; quinoxalino[6,5-f]quinoxaline; side chain engineering; wide bandgap copolymers;

D O I：

10.1002/adfm.201701491

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Two novel wide bandgap copolymers based on quinoxalino[6,5-f]quinoxaline (NQx) acceptor block, PBDT-NQx and PBDTS-NQx, are successfully synthesized for efficient nonfullerene polymer solar cells (PSCs). The attached conjugated side chains on both benzodithiophene (BDT) and NQx endow the resulting copolymers with low-lying highest occupied molecular orbital (HOMO) levels. The sulfur atom insertion further reduces the HOMO level of PBDTS-NQx to -5.31 eV, contributing to a high open-circuit voltage, V-oc, of 0.91 V. Conjugated n-octylthienyl side chains attached on the NQx skeletons also significantly improve the pi-pi* transitions and optical absorptions of the copolymers in the region of short wavelengths, which induce a good complementary absorption when blending with the low bandgap small molecular acceptor of 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2',3'-d']-s-indaceno[1,2-b:5,6-b']dithiophene. The wide absorption range makes the active blends absorb more photons, giving rise to a high short-circuit current density, J(sc), value of 15.62 mA cm(-2). The sulfur atom insertion also enhances the crystallinity of PBDTS-NQx and presents its blend film with a favorable nano-phase separation, resulting in improved J(sc) and fill factor (FF) values with a high power conversion efficiency of 11.47%. This work not only provides a new fused ring acceptor block (NQx) for constructing high-performance wide bandgap copolymers but also provides the NQx-based copolymers for achieving highly efficient nonfullerene PSCs.

引用

页数：11

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