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Improved environmental stability of organic lead trihalide perovskite-based photoactive-layers in the presence of mesoporous TiO2

Flannan T. F. O'Mahony, Yong Hui Lee, Cameron Jellett, Stoichko Dmitrov, Daniel T. J. Bryant, James R. Durrant, Brian C. O'Regan, Michael Graetzel, Mohammad K. Nazeeruddin, Saif A. Haque, Stoichko Dimitrov Orcid Logo

J. Mater. Chem. A, Volume: 3, Issue: 14, Pages: 7219 - 7223

Swansea University Author: Stoichko Dimitrov Orcid Logo

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DOI (Published version): 10.1039/C5TA01221J

Abstract

Impressive hybrid photovoltaic device performances have been realised with the methylammonium lead triiodide (MAPbI3) perovskite absorber in a wide range of device architectures. However, the question as to which of these systems represents the most commercially viable long-term prospect is yet to b...

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Published in: J. Mater. Chem. A
ISSN: 2050-7488 2050-7496
Published: The Royal Society of Chemistry 2015
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URI: https://cronfa.swan.ac.uk/Record/cronfa32020
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Abstract: Impressive hybrid photovoltaic device performances have been realised with the methylammonium lead triiodide (MAPbI3) perovskite absorber in a wide range of device architectures. However, the question as to which of these systems represents the most commercially viable long-term prospect is yet to be answered conclusively. Here, we report on the photoinduced charge transfer processes in MAPbI3 based films measured under inert and ambient conditions. When exposed to ambient conditions, the coated mesoporous Al2O3 and bilayer systems show a rapid and significant degradation in the yield of long-lived charge separation. This process, which does not affect sensitized-mesoporous TiO2 films, is only found to occur when both light and oxygen are present. These observations indicate that the presence of a mesostructured TiO2 electron acceptor to rapidly extract the photoexcited electron from the perovskite sensitizer may be crucial for fundamental photovoltaic stability and significantly increases innate tolerance to environmental conditions. This work highlights a significant advantage of retaining mesoscale morphological control in the design of perovskite photovoltaics.
College: College of Engineering
Issue: 14
Start Page: 7219
End Page: 7223