Bithiazole-bridged dyes for dye-sensitized solar cells with high open circuit voltage performance

被引:147
作者
He, Jinxiang
Wu, Wenjun
Hua, Jianli [1 ]
Jiang, Yihua
Qu, Sanyin
Li, Jing
Long, Yitao
Tian, He
机构
[1] E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China
关键词
NANOCRYSTALLINE TIO2 FILMS; PHOTOVOLTAIC PROPERTIES; EFFICIENT SENSITIZATION; MOLECULAR DESIGN; COUMARIN DYES; CYANINE; DONOR; COPOLYMERS; BITHIOPHENE; ABSORPTION;
D O I
10.1039/c0jm03811c
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
Five new metal-free organic dyes (T1-T5) containing bithiazole moieties were synthesized and used for dye-sensitized solar cells (DSSCs). Their absorption spectra, electrochemical and photovoltaic properties were fully characterized. Electrochemical measurement data indicate that the tuning of the HOMO and LUMO energy levels can be conveniently accomplished by alternating the donor moiety. All of these dyes performed as sensitizers for the DSSC test, and the photovoltaic performance data of these bithiazole-bridged dyes showed higher open circuit voltages (745-810 mV). Among the five dyes, T1 showed the best photovoltaic performance: a maximum monochromatic incident photon-to-current conversion efficiency (IPCE) of 83.8%, a short-circuit photocurrent density (J(sc)) of 11.78 mA cm(-2), an open-circuit photovoltage (V-oc) of 810 mV, and a fill factor (ff) of 0.60, corresponding to an overall conversion efficiency of 5.73% under standard global AM 1.5 solar light condition, which reached 93% with respect to that of an N719-based device fabricated under similar conditions. The result shows that the metal-free dyes based on bithiazole pi-conjugation are promising candidates for improvement of the performance of DSSCs.
引用
收藏
页码:6054 / 6062
页数:9
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