Imperial College London
Alternate

ProfessorSaifHaque

Faculty of Natural Sciences, Department of Chemistry

Professor of Chemistry
 
 
 
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Contact

 

+44 (0)20 7594 1886s.a.haque

 
 
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Location

 

110HMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Aristidou:2017:10.1038/ncomms15218,
author = {Aristidou, N and Haque, S and Eames, C and Sanchez-Molina, I and Bu, X and Kosco, J and Saiful, Islam M and Haque, SA},
doi = {10.1038/ncomms15218},
journal = {Nature Communications},
pages = {1--10},
title = {Fast oxygen diffusion and iodide defects mediate oxygen-induced degradation of perovskite solar cells},
url = {http://dx.doi.org/10.1038/ncomms15218},
volume = {8},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Methylammonium   lead   halide   perovskites   are   attracting   intense   interest   as   promising materials for next-generation solar cells, but serious issues related to long-term stability need to  be  addressed.  Specifically,  perovskite  films  based  on CH3NH3PbI3  undergo  fast  oxygen- and light-induced degradation. However, the mechanism of such degradation and its relation to particle size and oxygen transport are poorly understood. Here, we report new mechanistic insights  through  the  combined  use  of  isothermal  gravimetric  analysis,  photoluminescence, secondary  ion  mass  spectrometry  and  ab  initio  simulation  techniques.  We  find  fast  oxygen diffusion into CH3NH3PbI3 films is accompanied by superoxide formation, which are critical to degradation by oxygen in the atmosphere.Perovskite films composed of small crystallites show high yields of photo-induced superoxide species and low stability. Ab initio simulations indicate  that  iodide  vacancies  are  the  preferred  sites  in  mediating  the  photo-induced formation  of  superoxide  species  from  oxygen. We  also  show  that  thin-film  passivation  with iodide salts can lead to enhanced film stability and thus device stability. The understanding of degradation  phenomena  gained  from  this  study  is  important  for  the  future  design  and optimisation of perovskite solar cells with greater stability.
AU  - Aristidou,N
AU  - Haque,S
AU  - Eames,C
AU  - Sanchez-Molina,I
AU  - Bu,X
AU  - Kosco,J
AU  - Saiful,Islam M
AU  - Haque,SA
DO  - 10.1038/ncomms15218
EP  - 10
PY  - 2017///
SN  - 2041-1723
SP  - 1
TI  - Fast oxygen diffusion and iodide defects mediate oxygen-induced degradation of perovskite solar cells
T2  - Nature Communications
UR  - http://dx.doi.org/10.1038/ncomms15218
UR  - https://www.nature.com/articles/ncomms15218
UR  - http://hdl.handle.net/10044/1/44949
VL  - 8
ER  -
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