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Transformation of the Excited State and Photovoltaic Efficiency of CH3NH3PbI3 Perovskite upon Controlled Exposure to Humidified Air

Open access
Christians, Jeffrey A., Miranda Herrera, Pierre A., Kamat, Prashant V.·2015·Journal of the American Chemical Society

Abstract

Humidity has been an important factor, in both negative and positive ways, in the development of perovskite solar cells and will prove critical in the push to commercialize this exciting new photovoltaic technology. The interaction between CH(3)NH(3)PbI(3) and H(2)O vapor is investigated by characterizing the ground-state and excited-state optical absorption properties and probing morphology and crystal structure. These undertakings reveal that H(2)O exposure does not simply cause CH(3)NH(3)PbI(3) to revert to PbI(2). It is shown that, in the dark, H(2)O is able to complex with the perovskite, forming a hydrate product similar to (CH(3)NH(3))(4)PbI(6)·2H(2)O. This causes a decrease in absorption across the visible region of the spectrum and a distinct change in the crystal structure of the material. Femtosecond transient absorption spectroscopic measurements show the effect that humidity has on the ultrafast excited state dynamics of CH(3)NH(3)PbI(3). More importantly, the deleterious effects of humidity on complete solar cells, specifically on photovoltaic efficiency and stability, are explored in the light of these spectroscopic understandings.

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Metadata

Authors
Christians, J. A., Miranda Herrera, P. A., & Kamat, P. V.
Venue
Journal of the American Chemical Society
Published
2015-01-27
Volume
137
Issue
4
Pages
1530-1538
ISSN
  • 0002-7863 (ISSN-L)
  • 1520-5126
OpenAlex
W1991981401
Cited by
1,367
References
2
FWCI
77.46
Type
journal article
Language
en
Open access
hybrid

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