Electron injection and scaffold effects in perovskite solar cells

Journal of Materials Chemistry. C, Materials for Optical and Electronic Devices
Miguel AnayaIvan Mora-Sero

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 res...Continue Reading

References

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Citations

Mar 30, 2017·ACS Applied Materials & Interfaces·Naemeh AeinehIván Mora-Seró
Mar 14, 2017·The Journal of Physical Chemistry Letters·Elnaz GhahremaniradJuan Bisquert
Sep 10, 2020·The Journal of Physical Chemistry Letters·Agustin O AlvarezFrancisco Fabregat-Santiago
Sep 20, 2018·ACS Applied Materials & Interfaces·Maria UlfaThierry Pauporté

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Methods Mentioned

BETA
X-ray
transmission electron microscopy

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