Spatial Extent and the Role of Ions in Non-Radiative Recombination at Perovskite – Transport Layer Interfaces
Imme Schuringa a, Toon Maassen a, Moritz Schmidt a, Bruno Ehrler a b
a Center for Nanophotonics, AMOLF, Amsterdam, The Netherlands, Science Park 104, Amsterdam, Netherlands
b Zernike Institute for Advanced Materials, University of Groningen, The Netherlands, Nijenborgh, 7, Groningen, Netherlands
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Poster, Imme Schuringa, 259
Publication date: 20th April 2022

Perovskite solar cells rely on selective transport layers to efficiently extract charge carriers and reduce non-radiative recombination at the interface to the contacts. Although the bulk materials are relatively well understood, non-radiative recombination of charge carriers at the interfaces between the perovskite and the charge selective transport layers is still not fully understood nor eliminated, causing a drop in the open circuit voltage and therefore device efficiency. Usually, partial cell stacks are used to resolve the different interfaces and study the non-radiative recombination with photoluminescence (PL) techniques. However, this does not allow for study of non-radiative recombination at a contact under operating conditions with electrical bias.

In this work, interdigitated-back-contact cells are made such that the optical properties of the perovskite-nickel oxide interfaces can be studied in operando. Because the contacts are placed in plane, instead of stacked vertically, we can probe the optical properties in a spatially resolved manner from the top. We study the recombination dynamics of charge carriers with steady-state PL and transient PL, both under electrical bias. These measurements suggest the presence of a extraction barrier that decreases with the application of an increasing bias voltage. The timescale of the dynamics of the extraction barrier indicates that ions play a key role in the extraction of carriers at the nickel oxide contacts.

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