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Research Article

Performance enhancement of perovskite-sensitized mesoscopic solar cells using Nb-doped TiO2 compact layer

Xiong Yin1, Yanjun Guo1, Zhaosheng Xue2, Peng Xu1, Meng He1( ), Bin Liu2( )
CAS Key Laboratory of Nanosystem and Hierarchical FabricationNational Center for Nanoscience and TechnologyBeijing100190China
Department of Chemical and Biomolecular EngineeringNational University of SingaporeSingapore117576Singapore
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Abstract

Perovskite solar cells are one of the most promising alternatives to conventional photovoltaic devices, and extensive studies are focused on device optimization to further improve their performance. A compact layer of TiO2 is generally used in perovskite solar cells to block holes from reaching the fluorine-doped tin oxide electrode. In this contribution, we engineered a TiO2 compact layer using Nb doping, which resulted in solar cells with a power conversion efficiency (PCE) of 10.26%, which was higher than that of devices with the same configuration but containing a pristine TiO2 compact layer (PCE = 9.22%). The device performance enhancement was attributed to the decreased selective contact resistance and increased charge recombination resistance resulting from Nb doping, which was revealed by the impedance spectroscopy measurements. The developed strategy highlights the importance of interface optimization for perovskite solar cells.

Keywords

perovskite solar celldense filmspraying pyrolysis depositionNb-doped TiO2 compact layerimpedance spectroscopy

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Nano Research
Volume 8 Issue 6,
June 2015
Pages 1997-2003
DOI: 10.1007/s12274-015-0711-4
Cite this article:
Yin X, Guo Y, Xue Z, et al. Performance enhancement of perovskite-sensitized mesoscopic solar cells using Nb-doped TiO2 compact layer. Nano Research, 2015, 8(6): 1997-2003. https://doi.org/10.1007/s12274-015-0711-4

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Received: 29 November 2014
Revised: 26 December 2014
Accepted: 29 December 2014
Published: 08 April 2015
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2015
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