Benzothiadiazole Versus Thiophene: Influence of the Auxiliary Acceptor on the Photovoltaic Properties of Donor-Acceptor-Based Copolymers

被引：8
作者：
Li, Zongbo [1 ]
Weng, Kangkang [2 ]
Chen, Aihua [1 ]
Sun, Xiaobo [2 ]
Wei, Donghui [3 ]
Yu, Mingming [3 ]
Huo, Lijun [2 ]
Sun, Yanming [2 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Xueyuan Rd 37, Beijing 100191, Peoples R China
[2] Beihang Univ, Sch Chem, Xueyuan Rd 37, Beijing 100191, Peoples R China
[3] Zhengzhou Univ, Coll Chem & Mol Engn, Zhengzhou 450001, Henan, Peoples R China
来源：
MACROMOLECULAR RAPID COMMUNICATIONS | 2018年 / 39卷 / 02期
基金：
中国国家自然科学基金;
关键词：
benzothiadiazole; organic solar cells; power conversion efficiency; terpolymers; POLYMER SOLAR-CELLS; OPEN-CIRCUIT VOLTAGE; WIDE-BANDGAP POLYMER; ORGANIC PHOTOVOLTAICS; QUANTUM EFFICIENCY; CONJUGATED POLYMER; BUILDING-BLOCK; SIDE-CHAIN; PERFORMANCE; TERPOLYMERS;
D O I：
10.1002/marc.201700547
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
Two donor-acceptor (D-A) type conjugated copolymers, P1 and P2, are designed and synthesized. A classical benzothiadiazole acceptor is used to replace a thiophene unit in the polymer chain of P1 to obtain P2 terpolymer. Compared with P1, P2 exhibits broader absorption spectra, higher absorption coefficient, deeper lowest unoccupied molecular orbital level, and a relatively lower band gap. As a result, the P2-based solar cell exhibits a high power conversion efficiency (PCE) of 6.60%, with a short-circuit current (J(sc)) of 12.43 mA cm(-2), and a fill factor (FF) of 73.1%, which are higher than those of the P1-based device with a PCE of 4.70%, a J(sc) of 9.43 mA cm(-2), and an FF of 61.6%.
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页数：6
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