Terthieno[3,2-b]Thiophene (6T) Based Low Bandgap Fused-Ring Electron Acceptor for Highly Efficient Solar Cells with a High Short-Circuit Current Density and Low Open-Circuit Voltage Loss

被引:96
作者
Shi, Xueliang [1 ]
Chen, Jingde [1 ,2 ]
Gao, Ke [1 ]
Zuo, Lijian [1 ]
Yao, Zhaoyang [1 ]
Liu, Feng [3 ]
Tang, Jianxin [2 ]
Jen, Alex K. -Y. [1 ,4 ]
机构
[1] Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA
[2] Soochow Univ, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Inst Funct Nano & Soft Mat FUNSOM, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Suzhou 215123, Peoples R China
[3] Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China
[4] City Univ Hong Kong, Dept Chem, Kowloon, Hong Kong, Peoples R China
关键词
low bandgap semiconductors; nonfullerene acceptors; organic solar cells; ENERGY-LEVEL MODULATION; SMALL-MOLECULE ACCEPTOR; 13-PERCENT EFFICIENCY; ORGANIC PHOTOVOLTAICS; N-TYPE; FULLERENE; PERFORMANCE; DESIGN; ACHIEVE; OFFSET;
D O I
10.1002/aenm.201702831
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Aterthieno [3,2-b]thiophene (6T) based fused-ring low bandgap electron acceptor, 6TIC, is designed and synthesized for highly efficient nonfullerene solar cells. The chemical, optical, and physical properties, device characteristics, and film morphology of 6TIC are intensively studied. 6TIC shows a narrow bandgap with band edge reaching 905 nm due to the electron-rich p-conjugated 6T core and reduced resonance stabilization energy. The rigid, p-conjugated 6T also offers lower reorganization energy to facilitate very low V-OC loss in the 6TIC system. The analysis of film morphology shows that PTB7-Th and 6TIC can form crystalline domains and a bicontinuous network. These domains are enlarged when thermal annealing is applied. Consequently, the device based on PTB7-Th: 6TIC exhibits a high power conversion efficiency (PCE) of 11.07% with a high J(SC) > 20 mA cm(-2) and a high VOC of 0.83 V with a relatively low V-OC loss (approximate to 0.55 V). Moreover, a semitransparent solar cell based on PTB7-Th: 6TIC exhibits a relatively high PCE (7.62%). The device can have combined high PCE and high JSC is quite rare for organic solar cells.
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页数:8
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