Wijesekara, Anjana, Walker, Marc, Han, Yisong, Walker, David, Huband, Steven and Hatton, Ross A. (2021) Enhanced stability of tin halide perovskite photovoltaics using a bathocuproine - copper top electrode. Advanced Energy Materials, 11 (48). 2102766. doi:10.1002/aenm.202102766

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Abstract

Unencapsulated organo-tin halide perovskite photovoltaic (PV) devices exhibiting record stability (for organo-tin perovskite PV devices) when tested under continuous one sun solar illumination in ambient air and under electrical load are reported. This exceptional stability is made possible by the use of a bathocuproine | copper cathode in an inverted device architecture. A series of experiments designed to elucidate the underlying reasons for the high stability show that, compared to conventional silver electrodes, compact copper electrodes are far more resistant to corrosion by I2 gas (evolved when organo-tin halide decomposes) and toward adverse morphological evolution and ingress of oxygen and water molecules through the top electrode into the device. The findings of these experiments show that copper should be the metal of choice for the reflective cathode in inverted tin perovskite PVs when the material interfacing the metal interacts strongly with it, enabling compact film formation and a stable interface towards copper diffusion into the adjacent charge transport layer.

Item Type:	Journal Article
Subjects:	Q Science > QC Physics Q Science > QD Chemistry T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH):	Perovskite solar cells, Photovoltaic cells , Photovoltaic power systems, Semiconductor films, Perovskite, Electrodes, Copper
Journal or Publication Title:	Advanced Energy Materials
Publisher:	Wiley - V C H Verlag GmbH & Co. KGaA
ISSN:	1614-6832
Official Date:	23 December 2021
Dates:	Date Event 23 December 2021 Published 12 November 2021 Available 1 November 2021 Accepted
Volume:	11
Number:	48
Article Number:	2102766
DOI:	10.1002/aenm.202102766
Status:	Peer Reviewed
Publication Status:	Published
Publisher Statement:	This is the peer reviewed version of the following article: Wijesekara, A., Walker, M., Han, Y., Walker, D., Huband, S., Hatton, R. A., Enhanced Stability of Tin Halide Perovskite Photovoltaics Using a Bathocuproine—Copper Top Electrode. Adv. Energy Mater. 2021, 2102766., which has been published in final form at https://doi.org/10.1002/aenm.202102766 . This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
Access rights to Published version:	Open Access
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID Chancellor’s International Scholarship University of Warwick http://dx.doi.org/10.13039/501100000741

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