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The Role of Thickness Control and Interface Modification in Assembling Efficient Planar Perovskite Solar Cells

1
Institute for Materials Discovery, University College London, London WC1E 7JE, UK
2
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Molecules 2019, 24(19), 3466; https://doi.org/10.3390/molecules24193466
Received: 27 June 2019 / Revised: 5 September 2019 / Accepted: 8 September 2019 / Published: 24 September 2019
(This article belongs to the Special Issue Perovskites and Perovskite Solar Cells)
Perovskite solar cells (PSCs) have achieved tremendous success within just a decade. This success is critically dependent upon compositional engineering, morphology control of perovskite layer, or contingent upon high-temperature annealed mesoporous TiO2, but quantitative analysis of the role of facile TiCl4 treatment and thickness control of the compact TiO2 layer has not been satisfactorily undertaken. Herein, we report the facile thickness control and post-treatment of the electron transport TiO2 layer to produce highly efficient planar PSCs. TiCl4 treatment of TiO2 layer could remove the surface trap and decrease the charge recombination in the prepared solar cells. Introduction of ethanol into the TiCl4 aqueous solution led to further improved open-circuit voltage and short-circuit current density of the related devices, thus giving rise to enhanced power conversion efficiency (PCE). After the optimal TiCl4 treatment, PCE of 16.42% was achieved for PSCs with TiCl4 aqueous solution-treated TiO2 and 19.24% for PSCs with TiCl4 aqueous/ethanol solution-treated TiO2, respectively. This work sheds light on the promising potential of simple planar PSCs without complicated compositional engineering and avoiding the deposition and optimization of the mesoporous scaffold layer. View Full-Text
Keywords: perovskite solar cell; titanium dioxide; surface treatment; titanium tetrachloride perovskite solar cell; titanium dioxide; surface treatment; titanium tetrachloride
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MDPI and ACS Style

Sun, W.; Choy, K.-L.; Wang, M. The Role of Thickness Control and Interface Modification in Assembling Efficient Planar Perovskite Solar Cells. Molecules 2019, 24, 3466.

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