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

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

O'Mahony, Flannan T. F.
•
Lee, Yong Hui  
•
Jellett, Cameron
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2015
Journal Of Materials Chemistry A

Impressive hybrid photovoltaic device performances have been realised with the methylammonium lead triiodide (MAPbI(3)) 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 MAPbI(3) 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.

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Type
research article
DOI
10.1039/c5ta01221j
Web of Science ID

WOS:000351845400004

Author(s)
O'Mahony, Flannan T. F.
•
Lee, Yong Hui  
•
Jellett, Cameron
•
Dmitrov, Stoichko
•
Bryant, Daniel T. J.
•
Durrant, James R.
•
O'Regan, Brian C.
•
Graetzel, Michael  
•
Nazeeruddin, Mohammad K.  
•
Haque, Saif A.
Date Issued

2015

Publisher

Royal Soc Chemistry

Published in
Journal Of Materials Chemistry A
Volume

3

Issue

14

Start page

7219

End page

7223

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GMF  
LPI  
Available on Infoscience
May 29, 2015
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/114474
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