Lead iodide as a buffer layer in UV-induced degradation of CH3NH3PbI3 films

Melvin, A. A., Stoichkov, V. D., Kettle, J., Mogilyansky, D., Katz, E. A. and Visoly-Fisher, I. (2018) Lead iodide as a buffer layer in UV-induced degradation of CH3NH3PbI3 films. Solar Energy, 159, pp. 794-799. (doi: 10.1016/j.solener.2017.11.054)

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Encapsulated CH3NH3PbI3 films, the 'work horse' of the organic–inorganic perovskite-based photovoltaics, grown by one step- and two step- deposition methods, were used to study the effect of the film preparation method on their photostability. Time dependent light absorption decay under exposure to concentrated sunlight was used to estimate the degradation of the films. Films deposited by one step showed a significant decrease in the CH3NH3PbI3 absorbance when illuminated through the substrate, while films obtained through two step deposition exhibited almost no photodegradation under similar sunlight exposure. On the other hand, both types of films degraded significantly when irradiated through the top encapsulation. Unreacted PbI2 present near the substrate is suggested to be responsible for enhancing the photostability of the films obtained by two step deposition. Here, remnant PbI2 works as a UV filter and reduces UV light-induced degradation. The results demonstrate the significance of the preparation method in determining photochemical stability of the perovskite films, due to favorable property of remnant PbI2 in the absorber as a UV-protective layer.

Item Type:Articles
Additional Information:V.D.S., J.K., E.A.K. and I.V.-F. are members of the European Commission’s StableNextSol COST Action MP1307. The research was funded by the in part by Israel's Ministry of National Infrastructures, Water and Energy Resources (grant no. 0399202/215-11-037) and by the Adelis Foundation. E.A.K. also thanks the United States – Israel Binational Science Foundation. A.A.M. is thankful to BGU's Kreitman School of Advanced Graduate Studies for a postdoctoral research fellowship. V.D.S. and J.K. acknowledge the support by the Solar Photovoltaic Academic Research Consortium II (SPARC II) project, gratefully funded by WEFO. V.D.S. would like to thank the Sêr Cymru National Research Network for funding of his Ph.D. studies.
Glasgow Author(s) Enlighten ID:Kettle, Professor Jeff
Authors: Melvin, A. A., Stoichkov, V. D., Kettle, J., Mogilyansky, D., Katz, E. A., and Visoly-Fisher, I.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Solar Energy
ISSN (Online):1471-1257
Published Online:05 December 2017
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