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{Lin:2019:10.1039/C8TA11985F,
author = {Lin, C-T and Rossi, F and Kim, J and Baker, J and Ngiam, J and Xu, S and Pont, S and Aristidou, N and Haque, S and Watson, T and McLachlan, M and Durrant, J},
doi = {10.1039/C8TA11985F},
journal = {Journal of Materials Chemistry A},
title = {Evidence for surface defect passivation as the origin of the remarkable photostability of unencapsulated perovskite solar cells employing aminovaleric acid as a processing additive},
url = {http://dx.doi.org/10.1039/C8TA11985F},
volume = {7},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - This study addresses the cause of enhanced stability of methyl ammonium lead iodide when processed with aminovaleric acid additives (AVA-MAPbI3) in screen printed, hole transport layer free perovskite solar cells with carbon top electrodes (c-PSC). Employing AVA as an additive in the active layer caused a 40-fold increase in device lifetime measured under full sun illumination in ambient air (RH ~15%). This stability improvement with AVA was also observed in optical photobleaching studies of planar films on glass, indicating this improvement is intrinsic to the perovskite film. Employing low-energy ion scattering spectroscopy, photoluminescence studies as a function of AVA and oxygen exposure, and a molecular probe for superoxide generation, we conclude that even though superoxide is generated in both AVA-MAPbI3 and MAPbI3 films, AVA located at grain boundaries is able to passivate surface defect sites, resulting in enhanced resistivity to oxygen induced degradation. These results are discussed in terms of their implications for the design of environmentally stable perovskite solar cells.
AU  - Lin,C-T
AU  - Rossi,F
AU  - Kim,J
AU  - Baker,J
AU  - Ngiam,J
AU  - Xu,S
AU  - Pont,S
AU  - Aristidou,N
AU  - Haque,S
AU  - Watson,T
AU  - McLachlan,M
AU  - Durrant,J
DO  - 10.1039/C8TA11985F
PY  - 2019///
SN  - 2050-7496
TI  - Evidence for surface defect passivation as the origin of the remarkable photostability of unencapsulated perovskite solar cells employing aminovaleric acid as a processing additive
T2  - Journal of Materials Chemistry A
UR  - http://dx.doi.org/10.1039/C8TA11985F
UR  - http://hdl.handle.net/10044/1/66016
VL  - 7
ER  -
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