Molecular Ordering and Performance of Ternary Nonfullerene Organic Solar Cells via Bar-Coating in Air with an Efficiency over 13%

被引：25

作者：

Mao, Yuchao ^{[1
,2
]}

Guo, Chuanhang ^{[1
,2
]}

Li, Donghui ^{[1
,2
]}

Li, Wei ^{[1
,2
]}

Du, Baocai ^{[1
,2
]}

Chen, Mengxue ^{[1
,2
]}

Wang, Yalun ^{[1
,2
]}

Liu, Dan ^{[1
,2
]}

Wang, Tao ^{[1
,2
]}

机构：

[1] Wuhan Univ Technol, Sch Mat Sci & Engn, Wuhan 430070, Hubei, Peoples R China

[2] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Hubei, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2019年 / 11卷 / 39期

基金：

中国国家自然科学基金;

关键词：

bar coating; organic solar cells; ternary; non-fullerene; molecular ordering; MORPHOLOGY; AREA;

D O I：

10.1021/acsami.9b14464

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

An in situ spectroscopy ellipsometry technique is utilized to probe the molecular ordering sequences of PBDB-T2F/IT-4F/COi8DFIC ternary photovoltaic blends fabricated by bar-coating in air. The time-resolved dynamics show that the primary electron acceptor IT-4F aggregates ahead of the secondary acceptor COi8DFIC in the bar-coated photoactive layer, although the latter has much stronger crystallization ability. Wetting coefficient analysis supports that COi8DFIC locates at the interface between the host components PBDB-T-2F and IT-4F. We demonstrate that the suitable degree of phase separation with the presence of 20 wt % COi8DFIC facilitates exciton dissociation and charge transfer, leading to a remarkable power conversion efficiency of 13.2% as well as excellent stability of ternary organic solar cells (OSCs), which is among the highest reported efficiency for OSCs that were fabricated by scalable solution-casting in ambient conditions.

引用

页码：35827 / 35834

页数：8