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Understanding Performance Limiting Interfacial Recombination in pin Perovskite Solar Cells

Jonathan Warby Orcid Logo, Fengshuo Zu Orcid Logo, Stefan Zeiske, Emilio Gutierrez‐Partida, Lennart Frohloff, Simon Kahmann, Kyle Frohna, Edoardo Mosconi, Eros Radicchi, Felix Lang, Sahil Shah, Francisco Peña‐Camargo, Hannes Hempel, Thomas Unold, Norbert Koch, Ardalan Armin Orcid Logo, Filippo De Angelis, Samuel D. Stranks, Dieter Neher, Martin Stolterfoht Orcid Logo

Advanced Energy Materials, Volume: 12, Issue: 12, Start page: 2103567

Swansea University Authors: Stefan Zeiske, Ardalan Armin Orcid Logo

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DOI (Published version): 10.1002/aenm.202103567

Abstract

Perovskite semiconductors are an attractive option to overcome the limitations of established silicon based photovoltaic (PV) technologies due to their exceptional opto‐electronic properties and their successful integration into multijunction cells. However, the performance of single‐ and multijunct...

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Published in: Advanced Energy Materials
ISSN: 1614-6832 1614-6840
Published: Wiley 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa59391
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Abstract: Perovskite semiconductors are an attractive option to overcome the limitations of established silicon based photovoltaic (PV) technologies due to their exceptional opto‐electronic properties and their successful integration into multijunction cells. However, the performance of single‐ and multijunction cells is largely limited by significant nonradiative recombination at the perovskite/organic electron transport layer junctions. In this work, the cause of interfacial recombination at the perovskite/C60 interface is revealed via a combination of photoluminescence, photoelectron spectroscopy, and first‐principle numerical simulations. It is found that the most significant contribution to the total C60‐induced recombination loss occurs within the first monolayer of C60, rather than in the bulk of C60 or at the perovskite surface. The experiments show that the C60 molecules act as deep trap states when in direct contact with the perovskite. It is further demonstrated that by reducing the surface coverage of C60, the radiative efficiency of the bare perovskite layer can be retained. The findings of this work pave the way toward overcoming one of the most critical remaining performance losses in perovskite solar cells.
Keywords: C 60, defects, interface recombination, loss mechanisms, perovskites, solar cells
College: College of Science
Funders: Deutsche Forschungsgemeinschaft. Grant Numbers: SURPRISE 423749265, HIPSTER 424709669; Federal Ministry for Economic Affairs and Energy. Grant Numbers: P3T-HOPE, 03EE1017C; Alexander von Humboldt Foundation
Issue: 12
Start Page: 2103567