染料敏化电池中复合损失的重新评估：动态弛豫方法无法正确预测纳米多孔光电极中的扩散长度。

Re-evaluation of recombination losses in dye-sensitized cells: the failure of dynamic relaxation methods to correctly predict diffusion length in nanoporous photoelectrodes.

作者信息

Barnes Piers R F, Liu Lingxuan, Li Xiaoe, Anderson Assaf Y, Kisserwan Hawraa, Ghaddar Tarek H, Durrant James R, O'Regan Brian C

机构信息

Department of Chemistry, Imperial College London, London SW7 2AZ, U.K.

出版信息

Nano Lett. 2009 Oct;9(10):3532-8. doi: 10.1021/nl901753k.

DOI:10.1021/nl901753k

PMID:19645462

Abstract

Photocurrents generated by thick, strongly absorbing, dye-sensitized cells were reduced when the electrolyte iodine concentration was increased. Electron diffusion lengths measured using common transient techniques (L(n)) were at least two times higher than diffusion lengths measured at steady state (L(IPCE)). Charge collection efficiency calculated using L(n) seriously overpredicted photocurrent, while L(IPCE) correctly predicted photocurrent. This has implications for optimizing cell design.

摘要

当电解质碘浓度增加时，由厚的、强吸收的染料敏化电池产生的光电流会降低。使用常见瞬态技术测量的电子扩散长度（L(n)）至少比稳态下测量的扩散长度（L(IPCE)）高两倍。使用L(n)计算的电荷收集效率严重高估了光电流，而L(IPCE)正确地预测了光电流。这对优化电池设计具有重要意义。