Issue 41, 2017

Enhanced electronic transport in Fe3+-doped TiO2 for high efficiency perovskite solar cells

Abstract

Oxygen vacancies in non-stoichiometric TiO2 electron transport layers can capture injected electrons and act as recombination centers. In this study, the compact TiO2 electron transport layers of perovskite solar cells (PSCs) are doped with different molar ratios of Fe3+ in order to passivate such defects and improve their electron transport properties. The electrical conductivity, absorption, crystal structure, and the performance of the PSCs are systematically studied. It shows that Fe3+-doping improves the conductivity of TiO2 compact layers compared with the pristine TiO2, boosting the photovoltaic performance of PSCs. The reduced trap-filled limit voltage (VTFL) of the Fe3+-doped TiO2 compact layers suggests that trap density in the Fe3+-TiO2 films is much lower than that of a pristine TiO2 film. With the optimized doping concentration (1 mol%) of Fe3+, the best power conversion efficiency of PSCs is improved from 16.02% to 18.60%.

Graphical abstract: Enhanced electronic transport in Fe3+-doped TiO2 for high efficiency perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
23 Aug. 2017
Accepted
15 Sept. 2017
First published
18 Sept. 2017

J. Mater. Chem. C, 2017,5, 10754-10760

Enhanced electronic transport in Fe3+-doped TiO2 for high efficiency perovskite solar cells

X. Gu, Y. Wang, T. Zhang, D. Liu, R. Zhang, P. Zhang, J. Wu, Z. D. Chen and S. Li, J. Mater. Chem. C, 2017, 5, 10754 DOI: 10.1039/C7TC03845C

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