Effect of Li-doped TiO2 Compact Layers for Dye Sensitized Solar Cells

doi:10.3724/SP.J.1077.2011.00819

Abstract

Abstract: Both TiO₂ compact layer (d-TiO₂) and Li-doped TiO₂compact layer (d-Li-TiO₂) were deposited between nano-TiO₂ and transparent conductive oxide (TCO) for dye sensitized solar cells (DSSC) by the technique of pulsed laser deposition (PLD). XRD pattern shows the compact layers are crystallized in anatase structure. Compared with FTO-based DSSC without compact layer, the open voltage decay measurement shows the novel structure can slow the decay of the open circuit voltage, indicating an effective suppression of back electrons transfer from TCO to the electrolyte by the dense buffer layers. In addition, the interface resistance between the nano-TiO₂ and the TCO falls down due to the reduced energy band-gap of Li-doped TiO₂, which makes it easier to transfer the generated electrons from conducting band of nano-TiO₂to TCO surface, leading an enlarged short current from 4.2 mA/cm²of FTO-based to 4.8 mA/cm² for that with d-TiO₂ and 6.1 mA/cm² for d-Li-TiO₂, respectively. Thus, the photovoltaic energy conversion efficiency of DSSC based on the Li-doped TiO₂ compact layer enhances as much as 42% compared with that FTO-based DSSC without TiO₂compact layer.

Key words: dye-sensitized solar cell, Li-doped TiO2, compact layer, interface resistance

CLC Number:

O474

ZHOU Wen-Qian, LU Yu-Ming, CHEN Chang-Zhao, LIU Zhi-Yong, CAI Chuan-Bing. Effect of Li-doped TiO₂ Compact Layers for Dye Sensitized Solar Cells[J]. Journal of Inorganic Materials, 2011, 26(8): 819-822.

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Effect of Li-doped TiO₂ Compact Layers for Dye Sensitized Solar Cells

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