Stepped light-induced transient measurements of photocurrent and voltage in dye-sensitized solar cells: Application for highly viscous electrolyte systems

被引:242
作者
Nakade, S
Kanzaki, T
Wada, Y
Yanagida, S [1 ]
机构
[1] Osaka Univ, Ctr Adv Sci & Innovat, Suita, Osaka 5650871, Japan
[2] Osaka Univ, Grad Sch Engn, Suita, Osaka 5650871, Japan
关键词
D O I
10.1021/la051257j
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
To measure electron diffusion coefficients (D) and electron lifetimes (tau) of dye-sensitized solar cells (DSC), we introduced stepped light-induced transient measurements of photocurrent and voltage (SLIM-PCV), which can simplify the optical setup and reduce measurement time in comparison to conventional time-of-flight and frequency-modulated measurements. The method was applied to investigate the influence of the viscosity of a thermally stable high-boiling-point solvent on the energy conversion efficiency of DSCs. By systematic study of the influence of the viscosity, the species of cations as the counter charge of I-/I-3(-), and the concentrations of electrolytes, we concluded that a lower dye cation reduction rate due to slower iodine diffusion is a limiting factor for a highly viscous electrolyte system. On the other hand, comparable values of D and increased values of T were observed in a highly viscous electrolyte. By employing 0.5 M TBAI and 0.05 M I-2 in propylene carbonate, the efficiency of the DSC became comparable to that of a DSC using conventional electrolytes consisting of LiI, imidazolium iodide, and 4-tert-butylpyridine in methoxyacetonitrile. The simultaneous evaluation of D and tau through the appropriately simple measurement realizes fast optimization of the efficient and reliable DSC composed of thermally stable but often viscous 4 electrolytes.
引用
收藏
页码:10803 / 10807
页数:5
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