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

Gu, X; Wang, Y; Zhang, T; Liu, D; Zhang, R; Zhang, P; Wu, J; ... Li, S; + view all (2017) Enhanced electronic transport in Fe3+-doped TiO2 for high efficiency perovskite solar cells. Journal of Material Chemistry C , 5 (41) pp. 10754-10760. 10.1039/c7tc03845c. Green open access

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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%.

Type: Article
Title: Enhanced electronic transport in Fe3+-doped TiO2 for high efficiency perovskite solar cells
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/c7tc03845c
Publisher version: http://doi.org/10.1039/c7tc03845c
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Oxygen vacancies, conductivity, electronic transport, perovskite solar cells
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
URI: https://discovery.ucl.ac.uk/id/eprint/10038361
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