Molecular Engineering of Organic Dyes with a Hole-Extending Donor Tail for Efficient All-Solid-State Dye-Sensitized Solar Cells

被引:18
作者
Lu, Jianfeng [1 ]
Chang, Yu-Cheng [2 ,3 ]
Cheng, Hsu-Yang [2 ,3 ]
Wu, Hui-Ping [2 ,3 ]
Cheng, Yibing [1 ,4 ]
Wang, Mingkui [1 ]
Diau, Eric Wei-Guang [2 ,3 ]
机构
[1] Huazhong Univ Sci & Technol, Michael Gratzel Ctr Mesoscop Solar Cells, Wuhan 430074, Peoples R China
[2] Natl Chiao Tung Univ, Dept Appl Chem, Hsinchu 30010, Taiwan
[3] Natl Chiao Tung Univ, Inst Mol Sci, Hsinchu 30010, Taiwan
[4] Monash Univ, Dept Mat Engn, Melbourne, Vic 3800, Australia
关键词
donor-acceptor systems; dyes; porphyrinoids; sensitizers; solar cells; D-PI-A; OPEN-CIRCUIT VOLTAGE; PHOTOVOLTAIC PERFORMANCE; CO-SENSITIZATION; ZINC PORPHYRINS; LITHIUM-SALTS; ENERGY-LEVELS; LIGHT; PEROVSKITE; SEMICONDUCTORS;
D O I
10.1002/cssc.201500309
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report a new concept for the design of metal-free organic dyes (OD5-OD9) with an extended donor-pi-acceptor (D-pi-A) molecular framework, in which the donor terminal unit is attached by a hole-extending side chain to retard back electron transfer and charge recombination; the pi-bridge component contains varied thiophene-based substituents to enhance the light-harvesting ability of the device. The best dye (OD9) has a D-A-pi-A configuration with the hexyloxyphenylthiophene (HPT) side chain as a hole-extension component and a benzothiadiazole (BTD) internal acceptor as a pi-extension component. The co-sensitization of OD9 with the new porphyrin dye LW24 enhanced the light-harvesting ability to 800 nm; thus, a power conversion efficiency 5.5% was achieved. Photoinduced absorption (PIA) and transient absorption spectral (TAS) techniques were applied to account for the observed trend of the open-circuit voltage (V-OC) of the devices. This work provides insights into the molecular design, photovoltaic performance, and kinetics of charge recombination.
引用
收藏
页码:2529 / 2536
页数:8
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