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Carrier trapping and recombination: the role of defect physics in enhancing the open circuit voltage of metal halide perovskite solar cells

Leijtens, Tomas, Eperon, Giles E., Barker, Alex J., Grancini, Giulia, Zhang, Wei, Ball, James M., Kandada, Ajay Ram Srimath, Snaith, Henry J. and Petrozza, Annamaria (2016) Carrier trapping and recombination: the role of defect physics in enhancing the open circuit voltage of metal halide perovskite solar cells Energy & Environmental Science, 9 (11). pp. 3472-3481.

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Abstract

One of the greatest attributes of metal halide perovskite solar cells is their surprisingly low loss in potential between bandgap and open-circuit voltage, despite the fact that they suffer from a non-negligible density of sub gap defect states. Here, we use a combination of transient and steady state photocurrent and absorption spectroscopy to show that CH3NH3PbI3 films exhibit a broad distribution of electron traps. We show that the trapped electrons recombine with free holes unexpectedly slowly, on microsecond time scales, relaxing the limit on obtainable open-circuit voltage (VOC) under trap-mediated recombination conditions. We find that the observed VOCs in such perovskite solar cells can only be rationalized by considering the slow trap mediated recombination mechanism identified in this work. Our results suggest that existing processing routes may be good enough to enable open circuit voltages approaching 1.3 V in ideal devices with perfect contacts.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
NameEmailORCID
Leijtens, TomasUNSPECIFIEDUNSPECIFIED
Eperon, Giles E.UNSPECIFIEDUNSPECIFIED
Barker, Alex J.UNSPECIFIEDUNSPECIFIED
Grancini, GiuliaUNSPECIFIEDUNSPECIFIED
Zhang, Weiwz0003@surrey.ac.ukUNSPECIFIED
Ball, James M.UNSPECIFIEDUNSPECIFIED
Kandada, Ajay Ram SrimathUNSPECIFIEDUNSPECIFIED
Snaith, Henry J.UNSPECIFIEDUNSPECIFIED
Petrozza, AnnamariaUNSPECIFIEDUNSPECIFIED
Date : 1 November 2016
Identification Number : 10.1039/C6EE01729K
Copyright Disclaimer : © The Royal Society of Chemistry 2016. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
Depositing User : Clive Harris
Date Deposited : 05 Jun 2017 13:52
Last Modified : 20 Jun 2017 12:45
URI: http://epubs.surrey.ac.uk/id/eprint/841297

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