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Enhancing the operational stability of unencapsulated perovskite solar cells through Cu-Ag bilayer electrode incorporation

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Title: Enhancing the operational stability of unencapsulated perovskite solar cells through Cu-Ag bilayer electrode incorporation
Authors: Lin, C-T
Ngiam, J
Xu, S
Chang, Y-H
Du, T
Macdonald, TJ
Durrant, J
McLachlan, M
Item Type: Journal Article
Abstract: We identify a facile strategy that significantly reduces electrode corrosion and device degradation in unencapsulated perovskite solar cells (PSCs) operating in ambient air. By employing Cu-Ag bilayer top electrodes PSCs, we show enhanced operational lifetime compared with devices prepared from single metal (Al, Ag and Cu) analogues. Time-of-flight secondary ion mass spectrometry depth profiles indicate that the insertion of the thin layer of Cu (10nm) below the Ag (100nm) electrode significantly reduces diffusion of species originating in the perovskite active layer into the electron transport layer and electrode. X-ray diffraction (XRD) analysis reveals the mutually beneficial relationship between the bilayer metals, whereby the thermally evaporated Ag inhibits Cu oxidation and the Cu prevents interfacial reactions between the perovskite and Ag. The results here not only demonstrate a simple approach to prevent the electrode and device degradation that enhance lifetime and stability but also give an insight into ageing related ion migration and structural reorganisation.
Issue Date: 7-May-2020
Date of Acceptance: 14-Apr-2020
URI: http://hdl.handle.net/10044/1/78013
DOI: 10.1039/d0ta01606c
ISSN: 2050-7488
Publisher: Royal Society of Chemistry (RSC)
Start Page: 8684
End Page: 8691
Journal / Book Title: Journal of Materials Chemistry A
Volume: 8
Issue: 17
Copyright Statement: © Royal Society of Chemistry 2020
Keywords: 0303 Macromolecular and Materials Chemistry
0912 Materials Engineering
0915 Interdisciplinary Engineering
Publication Status: Published
Online Publication Date: 2020-04-14
Appears in Collections:Materials
Chemistry
Faculty of Natural Sciences
Faculty of Engineering