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Electron injection and scaffold effects in perovskite solar cells

Anaya, Miguel, Zhang, Wei, Hames, Bruno Clasen, Li, Yuelong, Fabregat-Santiago, Francisco, Calvo, Mauricio E., Snaith, Henry J., Míguez, Hernán and Mora-Seró, Iván (2017) Electron injection and scaffold effects in perovskite solar cells Journal of Materials Chemistry C, 5 (3). pp. 634-644.

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Abstract

In spite of the impressive efficiencies reported for perovskite solar cells (PSCs), key aspects of their working principles, such as electron injection at the contacts or the suitability of the utilization of a specific scaffold layer, are not yet fully understood. Increasingly complex scaffolds attained by the sequential deposition of TiO2 and SiO2 mesoporous layers onto transparent conducting substrates are used to perform a systematic characterization of both the injection process at the electron selective contact and the scaffold effect in PSCs. By forcing multiple electron injection processes at a controlled sequence of perovskite–TiO2 interfaces before extraction, interfacial injection effects are magnified and hence characterized in detail. An anomalous injection behavior is observed, the fingerprint of which is the presence of significant inductive loops in the impedance spectra with a magnitude that correlates with the number of interfaces in the scaffold. Analysis of the resistive and capacitive behavior of the impedance spectra indicates that the scaffolds could hinder ion migration, with positive consequences such as lowering the recombination rate and implications for the current–potential curve hysteresis. Our results suggest that an appropriate balance between these advantageous effects and the unavoidable charge transport resistive losses introduced by the scaffolds will help in the optimization of PSC performance.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
NameEmailORCID
Anaya, MiguelUNSPECIFIEDUNSPECIFIED
Zhang, Weiwz0003@surrey.ac.ukUNSPECIFIED
Hames, Bruno ClasenUNSPECIFIEDUNSPECIFIED
Li, YuelongUNSPECIFIEDUNSPECIFIED
Fabregat-Santiago, FranciscoUNSPECIFIEDUNSPECIFIED
Calvo, Mauricio E.UNSPECIFIEDUNSPECIFIED
Snaith, Henry J.UNSPECIFIEDUNSPECIFIED
Míguez, HernánUNSPECIFIEDUNSPECIFIED
Mora-Seró, IvánUNSPECIFIEDUNSPECIFIED
Date : 7 February 2017
Identification Number : 10.1039/C6TC04639H
Copyright Disclaimer : ©The Royal Society of Chemistry 2017. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
Depositing User : Clive Harris
Date Deposited : 05 Jun 2017 12:56
Last Modified : 06 Jun 2017 07:16
URI: http://epubs.surrey.ac.uk/id/eprint/841294

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