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{Pont:2017:10.1039/C7TA00058H,
author = {Pont, S and Bryant, D and Lin, CH and Aristidou, N and Wheeler, S and Ma, X and Godin, R and Haque, S and Durrant, JR},
doi = {10.1039/C7TA00058H},
journal = {Journal of Materials Chemistry A},
title = {Tuning CH 3 NH 3 Pb(I 1-x Br x ) 3  Perovskite Oxygen Stability in Thin Films and Solar Cells},
url = {http://dx.doi.org/10.1039/C7TA00058H},
volume = {5},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The rapid development of organic–inorganic lead halide perovskites has resulted in high efficiency photovoltaic devices. However the susceptibility of these devices to degradation under environmental stress has so far hindered commercial development, requiring for example expensive device encapsulation. Herein, we have investigated the stability of CH3NH3Pb(I1−xBrx)3 [x = 0–1] thin films and solar cells under controlled humidity, light, and oxygen conditions. We show that higher bromide ratios increase tolerance to moisture, with x = 1 thin films being stable to 120 h of moisture stress. Under light and dry air, partial bromide (x < 1) substitution does not enhance film stability significantly, with the corresponding solar cells degrading within two hours. In contrast, CH3NH3PbBr3 films show excellent stability, with device stability being limited by the organic interlayer. For these x = 1 films, we show that charge carriers are quenched in the presence of oxygen and form superoxide; however in contrast to perovskites containing iodide, this superoxide does not degrade the crystal. Our observations show that iodide limits the oxygen and light stability of CH3NH3Pb(I1−xBrx)3 perovskites, but that CH3NH3PbBr3 provides an opportunity to develop inherently stable high voltage photovoltaic devices and 4-terminal tandem solar cells.
AU  - Pont,S
AU  - Bryant,D
AU  - Lin,CH
AU  - Aristidou,N
AU  - Wheeler,S
AU  - Ma,X
AU  - Godin,R
AU  - Haque,S
AU  - Durrant,JR
DO  - 10.1039/C7TA00058H
PY  - 2017///
SN  - 2050-7488
TI  - Tuning CH 3 NH 3 Pb(I 1-x Br x ) 3  Perovskite Oxygen Stability in Thin Films and Solar Cells
T2  - Journal of Materials Chemistry A
UR  - http://dx.doi.org/10.1039/C7TA00058H
UR  - http://hdl.handle.net/10044/1/49212
VL  - 5
ER  -
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