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Issue 3, 2017
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Electron injection and scaffold effects in perovskite solar cells

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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.

Graphical abstract: Electron injection and scaffold effects in perovskite solar cells

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Publication details

The article was received on 26 Oct 2016, accepted on 06 Dec 2016 and first published on 06 Dec 2016

Article type: Paper
DOI: 10.1039/C6TC04639H
Citation: J. Mater. Chem. C, 2017,5, 634-644
  • Open access: Creative Commons BY-NC license
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    Electron injection and scaffold effects in perovskite solar cells

    M. Anaya, W. Zhang, B. C. Hames, Y. Li, F. Fabregat-Santiago, M. E. Calvo, H. J. Snaith, H. Míguez and I. Mora-Seró, J. Mater. Chem. C, 2017, 5, 634
    DOI: 10.1039/C6TC04639H

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