Binary Organic Solar Cells with over 19 % Efficiency and Enhanced Morphology Stability Enabled by Asymmetric Acceptors

被引：45

作者：

Chen, Shihao ^{[1
]}

Zhu, Shengtian ^{[1
]}

Hong, Ling ^{[1
]}

Deng, Wanyuan ^{[1
]}

Zhang, Yi ^{[1
]}

Fu, Yuang ^{[2
]}

Zhong, Zuiyi ^{[1
]}

Dong, Minghao ^{[1
]}

Liu, Chunchen ^{[1
]}

Lu, Xinhui ^{[2
]}

Zhang, Kai ^{[1
]}

Huang, Fei ^{[1
]}

机构：

[1] South China Univ Technol, Inst Polymer Optoelect Mat & Devices, Sch Mat Sci & Engn, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Peoples R China

[2] Chinese Univ HongKong, Dept Phys, Hong Kong 999077, Peoples R China

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2024年 / 63卷 / 12期

基金：

中国国家自然科学基金;

关键词：

acceptor; non-fullerene; haloalkyl chains; stability; organic solar cells; POLYMER; DEGRADATION; DESIGN;

D O I：

10.1002/anie.202318756

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The simultaneous improvement of efficiency and stability of organic solar cells (OSCs) for commercialization remains a challenging task. Herein, we designed asymmetric acceptors DT-C8Cl and DT-C8BTz with functional haloalkyl chains, in which the halogen atoms could induce noncovalent interactions with heteroatoms like O, S, and Se, etc., thus leading to appropriately manipulated film morphology. Consequently, binary devices based on D18: DT-C8Cl achieved a champion power conversion efficiency (PCE) of 19.40 %. The higher PCE of D18: DT-C8Cl could be attributed to the enhanced pi-pi stacking, improved charge transport, and reduced recombination losses. In addition, the noncovalent interactions induced by haloalkyl chains could effectively suppress unfavorable morphology evolutions and thereby reduce trap density of states, leading to improved thermal and storage stability. Overall, our findings reveal that the rational design of asymmetric acceptors with functional haloalkyl chains is a novel and powerful strategy for simultaneously enhancing the efficiency and stability of OSCs. Asymmetric acceptor DT-C8Cl with functional haloalkyl chains was designed and synthesized, where noncovalent interactions induced by haloalkyl chains could effectively optimize the morphology and suppress unfavorable morphology evolutions, leading to simultaneously enhanced efficiency and morphology stability of organic solar cells.+ image

引用

页数：11

共 59 条

[1] Sample-shape dependent energy levels in organic semiconductors [J].