The Interplay of Contact Layers: How the Electron Transport Layer Influences Interfacial Recombination and Hole Extraction in Perovskite Solar Cells.

Hermes IM, Hou Y, Bergmann VW, Brabec C, Weber SA (2018)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2018

Journal

Journal of Physical Chemistry Letters American Chemical Society

Pages Range: 6249-6256

DOI: 10.1021/acs.jpclett.8b02824

Abstract

Charge selective contact layers in perovskite solar cells influence the current density-voltage
hysteresis, an effect related to ion migration in the perovskite. As such, fullerene-based electron
transport layers (ETL) suppress hysteresis by reducing the mobile ion concentration. However, the
impact of different ETL on the electronic properties of other constituent device layers remains
unclear. In this Kelvin probe force microscopy study, we compared potential distributions of
methylammonium lead iodide-based solar cells with two ETL (planar TiO2 and C60-functionalized
self-assembled monolayer) with different hysteretic behavior. We found significant changes in the
potential distribution of the organic hole transport layer spiroMeOTAD, suggesting the formation
of a neutral spiroMeOTAD-iodide interface due to a reaction between iodide with p-doped
spiroMeOTAD in the TiO2 cell. Our results show that the ETL affects not only the mobile ion concentration and the recombination at the perovskite/ETL interface but also the resistance and capacitance of the spiroMeOTAD.

Authors with CRIS profile

Yi Hou Institute Materials for Electronics and Energy Technology (i-MEET) Christoph Brabec Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

Max-Planck-Institut für Polymerforschung (MPI-P) / Max Planck Institute for Polymer Research DE Germany (DE)

How to cite

APA:

Hermes, I.M., Hou, Y., Bergmann, V.W., Brabec, C., & Weber, S.A. (2018). The Interplay of Contact Layers: How the Electron Transport Layer Influences Interfacial Recombination and Hole Extraction in Perovskite Solar Cells. Journal of Physical Chemistry Letters, 6249-6256. https://dx.doi.org/10.1021/acs.jpclett.8b02824

MLA:

Hermes, Ilka M., et al. "The Interplay of Contact Layers: How the Electron Transport Layer Influences Interfacial Recombination and Hole Extraction in Perovskite Solar Cells." Journal of Physical Chemistry Letters (2018): 6249-6256.

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