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

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Title: Improved environmental stability of organic lead trihalide perovskite-based photoactive-layers in the presence of mesoporous TiO2
Authors: O'Mahony, FTF
Lee, YH
Jellett, C
Dmitrov, S
Bryant, DTJ
Durrant, JR
O'Regan, BC
Graetzel, M
Nazeeruddin, MK
Haque, SA
Item Type: Journal Article
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.
Issue Date: 13-Mar-2015
Date of Acceptance: 19-Feb-2015
URI: http://hdl.handle.net/10044/1/41368
DOI: http://dx.doi.org/10.1039/c5ta01221j
ISSN: 2050-7496
Publisher: Royal Society of Chemistry
Start Page: 7219
End Page: 7223
Journal / Book Title: Journal of Materials Chemistry A
Volume: 3
Issue: 14
Copyright Statement: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Sponsor/Funder: Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (E
Engineering & Physical Science Research Council (EPSRC)
Commission of the European Communities
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/H040218/1
n/a
EP/K039946/1
Grant Agreement no. 308997
EP/M023532/1
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Materials Science
SENSITIZED SOLAR-CELLS
PERFORMANCE
DEPOSITION
EFFICIENCY
CH3NH3PBI3
LENGTHS
Publication Status: Published
Appears in Collections:Chemistry
Faculty of Natural Sciences



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