Issue 6, 2020

A bilayer TiO2/Al2O3 as the mesoporous scaffold for enhanced air stability of ambient-processed perovskite solar cells

Abstract

Research on the air stability of perovskite solar cells (PSCs) has attracted great attention in the field of photovoltaics. Although devices based on lead halide perovskites show outstanding efficiency, their commercialization is hampered by the instability of the perovskite under exposure to moisture in ambient air. The use of mesoporous scaffolds has been considered as a promising method to protect the perovskite from moisture ingress. Here, we demonstrate a TiO2/Al2O3 bilayer as the mesoporous scaffold to enhance the air stability of PSCs. PSCs based on the TiO2/Al2O3 mesoporous scaffold were assembled in ambient air at a relative humidity (RH) of over 65%, delivering a champion power conversion efficiency (PCE) of 16.84%. More importantly, PSCs based on TiO2/Al2O3 retained 82% of their initial PCE after storage in ambient air for 2000 h without any encapsulation. In comparison, PSCs based on a single layer of mesoporous TiO2 retained only 57% of their initial PCE. In addition, the TiO2/Al2O3 mesoporous scaffold shows no reduction in light transmission in the visible region in comparison to a single layer of TiO2, indicating its potential to be used for semi-transparent and tandem PSC applications.

Graphical abstract: A bilayer TiO2/Al2O3 as the mesoporous scaffold for enhanced air stability of ambient-processed perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
03 aug 2020
Accepted
17 aug 2020
First published
19 aug 2020
This article is Open Access
Creative Commons BY license

Mater. Adv., 2020,1, 2057-2067

A bilayer TiO2/Al2O3 as the mesoporous scaffold for enhanced air stability of ambient-processed perovskite solar cells

D. Wang, Q. Chen, H. Mo, J. Jacobs, A. Thomas and Z. Liu, Mater. Adv., 2020, 1, 2057 DOI: 10.1039/D0MA00562B

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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