Side chain engineering of quinoxaline-based small molecular nonfullerene acceptors for high-performance poly(3-hexylthiophene)-based organic solar cells

被引：0

作者：

Bo Xiao ^{[1
,2
]}

Qianqian Zhang ^{[1
,3
]}

Gongqiang Li ^{[3
]}

Mengzhen Du ^{[1
,3
]}

Yanfang Geng ^{[1
]}

Xiangnan Sun ^{[1
,2
]}

Ailing Tang ^{[1
]}

Yingliang Liu ^{[4
]}

Qiang Guo ^{[4
]}

Erjun Zhou ^{[1
,2
,4
]}

机构：

[1] CAS Key Laboratory of Nanosystem and Hierarchical Fabrication,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology

[2] Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences

[3] Key Laboratory of Flexible Electronic(KLOFE) & Institute of Advanced Materials (IAM),Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM),Nanjing Tech University (Nanjing Tech)

[4] Henan Institutes of Advanced Technology,Zhengzhou University

来源：

Science China(Chemistry) | 2020年 / 02期

关键词：

P3HT; non-fullerene acceptor; phenyl; quinoxaline; organic solar cells;

D O I：

暂无

中图分类号：

TQ317 [高分子化合物产品]; TM914.4 [太阳能电池];

学科分类号：

0805 ; 080502 ;

摘要：

Poly（3-hexylthiophene）(P3HT) is one of the most used semiconducting polymers for organic photovoltaics because it has potential for commercialization due to its easy synthesis and stability.Although the rapid development of the small molecular non-fullerene acceptors（NFAs） have largely improved the power conversion efficiency（PCE） of organic solar cells（OSCs）based on other complicated p-type polymers,the PCE of P3HT-based OSCs is still low.In addition,the design principle and structure-properties correlation for the NFAs matching well with P3HTare still unclear and need to be investigated in depth.Here we designed a series of NFAs comprised of acceptor（A） and donor（D） units with an A2-A1-D-A1-A2 configuration.These NFAs are abbreviated as Qx3,Qx3 b and Qx3c,where indaceno[1,2-b:5,6-b′]dithiophene（IDT）,quinoxaline（Qx） and 2-（1,1-dicyanomethylene）rhodanine serve as the middle D,bridged A1 and the end group A2,respectively.By subtracting the phenyl side groups appended on both IDT and Qx skeletons,the absorption spectra,energy levels and crystallinity could be regularly modulated.When paired with P3 HT,three NFAs show totally different photovoltaic performance with PCEs of 3.37%（Qx3）,6.37%（Qx3b） and 0.03%（Qx3 c）,respectively.From Qx3 to Qx3b,the removing of phenyl side chain in the middle IDT unit results in the increase of crystallinity and electron mobility.However,after subtracting all the grafted phenyl side groups on both IDT and Qx units,the final molecule Qx3 c exhibits the lowest PCE of only 0.03%,which is mainly attributed to the serious phase-separation of the blend film.These results demonstrate that optimizing the substituted position of phenyl side groups for A2-A1-D-A1-A2 type NFAs is vital to regulate the optoelectronic property of molecule and morphological property of active layer for high performance P3HT-based OSCs.

引用

页码：254 / 264

页数：11