Electron transport patterns in TiO2 nanotube arrays based dye-sensitized solar cells under frontside and backside illuminations

Po Tsung Hsiao, Yong Jin Liou, Hsisheng Teng

研究成果: Article同行評審

49 引文 斯高帕斯(Scopus)

摘要

TiO2 nanotube arrays (NTA), of 17-37 μm in thickness, detached from anodic oxidized Ti foils were used as photoanodes for dye-sensitized solar cells (DSSCs). Photovoltaic measurements under frontside and backside illumination showed that frontside illumination geometry provided better cell performance than backside illumination did. A cell assembled with 30 μm thick NTA film produced the greatest photocurrent and light conversion efficiency. Despite an advantageous architecture for electron transport, electron trapping remained a limiting factor for both illumination geometries, due to the presence of crystal grains in the NTA walls. Intensity-modulated photocurrent spectroscopy (IMPS) analysis showed that electron transport in the front-illuminated cells comprises both trap-free and trap-limited diffusion modes, whereas electrons in the back-illuminated cells travel only by trap-limited diffusion. The trap-free diffusion mechanism determines front-illuminated cell performance. Electrochemical impedance spectroscopy analysis showed the front-illuminated NTA-based DSSCs have a charge collection efficiency of better than 90%, even at 30 μm NTA film thickness. Large crystal size results in low trap state density in the NTA film, and this effect may result in a more extensive trap-free diffusion zone in the films, which facilitates charge collection.

原文English
頁(從 - 到)15018-15024
頁數7
期刊Journal of Physical Chemistry C
115
發行號30
DOIs
出版狀態Published - 2011 八月 4

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 能源(全部)
  • 物理與理論化學
  • 表面、塗料和薄膜

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