Efficient Nonfullerene Polymer Solar Cells Enabled by a Novel Wide Bandgap Small Molecular Acceptor

被引：195

作者：

Zhang, Guangjun ^{[1
,2
]}

Yang, Guofang ^{[3
,4
]}

Yan, He ^{[3
,4
]}

Kim, Joo-Hyun ^{[5
]}

Ade, Harald ^{[5
]}

Wu, Wenlin ^{[1
,2
]}

Xu, Xiaopeng ^{[1
,2
]}

Duan, Yuwei ^{[1
,2
]}

Peng, Qiang ^{[1
,2
]}

机构：

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

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

[3] Hong Kong Univ Sci & Technol, Dept Chem, Kowloon 999077, Hong Kong, Peoples R China

[4] Hong Kong Univ Sci & Technol, Hong Kong Branch, Chinese Natl Engn Res Ctr Tissue Restorat & Recon, Kowloon 999077, Hong Kong, Peoples R China

[5] North Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA

来源：

ADVANCED MATERIALS | 2017年 / 29卷 / 18期

基金：

美国国家科学基金会;

关键词：

ELECTRON-ACCEPTORS; ORGANIC PHOTOVOLTAICS; 3D STRUCTURE; FULLERENE; MORPHOLOGY; GEOMETRY; DESIGN;

D O I：

10.1002/adma.201606054

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A wide bandgap small molecular acceptor, SFBRCN, containing a 3D spirobifluorene core flaked with a 2,1,3-benzothiadiazole (BT) and end-capped with highly electron-deficient (3-ethylhexyl-4-oxothiazolidine-2-yl) dimalononitrile (RCN) units, has been successfully synthesized as a small molecular acceptor (SMA) for nonfullerene polymer solar cells (PSCs). This SMA exhibits a relatively wide optical bandgap of 2.03 eV, which provides a complementary absorption to commonly used low bandgap donor polymers, such as PTB7-Th. The strong electron-deficient BT and RCN units afford SFBRCN with a low-lying LUMO (lowest unoccupied molecular orbital) level, while the 3D structured spirobifluorene core can effectively suppress the self-aggregation tendency of the SMA, thus yielding a polymer: SMA blend with reasonably small domain size. As the results of such molecular design, SFBRCN enables nonfullerene PSCs with a high efficiency of 10.26%, which is the highest performance reported to date for a large bandgap nonfullerene SMA.

引用

页数：7

共 32 条

[21] Control of the molecular geometry and nanoscale morphology in perylene diimide based bulk heterojunctions enables an efficient non-fullerene organic solar cell [J].