The instability exhibited by perovskite solar cells when exposed to the environment under illumination is one of the major obstacles for the entry of perovskite technology in the photovoltaic market. In this work, we use the external quantum efficiency (EQE) technique to study the photoinduced degradation of two types of solar cells having CH3NH3PbI3 as an absorber layer: one deposited by spin coating with an n-i-p architecture and the other deposited by evaporation with an inverted p-i-n structure. We also study the effect of different encapsulants to protect the cells against atmospheric agents. We find that EQE provides information regarding the areas of the cell most susceptible to degradation, in addition to providing an estimate of the optical gap and the Urbach energy of the absorbent material. We confirm that the combined action of illumination and the environment markedly accelerate the degradation, which is reflected in the deterioration of all the parameters of the cell. The rear part of the cell is the first region to suffer the light-induced degradation. On the other hand, the cells deposited by evaporation and with a good encapsulation process are highly stable since after 30 h of exposure just a small spectral change is noticed in the red/infrared region of the EQE spectrum.
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21 June 2020
Research Article|
June 17 2020
External quantum efficiency measurements used to study the stability of differently deposited perovskite solar cells
Special Collection:
Hybrid Organic-Inorganic Halide Perovskites
Pedro Hierrezuelo-Cardet;
Pedro Hierrezuelo-Cardet
1
Instituto de Física del Litoral (IFIS-Litoral), CONICET-UNL
, Güemes 3450, S3000GLN Santa Fe, Argentina
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Anderzon F. Palechor-Ocampo
;
Anderzon F. Palechor-Ocampo
1
Instituto de Física del Litoral (IFIS-Litoral), CONICET-UNL
, Güemes 3450, S3000GLN Santa Fe, Argentina
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Jorge Caram
;
Jorge Caram
1
Instituto de Física del Litoral (IFIS-Litoral), CONICET-UNL
, Güemes 3450, S3000GLN Santa Fe, Argentina
2
Facultad de Ingeniería Química, Universidad Nacional del Litoral
, Santiago del Estero 2829, S3000AOM Santa Fe, Argentina
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Federico Ventosinos
;
Federico Ventosinos
1
Instituto de Física del Litoral (IFIS-Litoral), CONICET-UNL
, Güemes 3450, S3000GLN Santa Fe, Argentina
2
Facultad de Ingeniería Química, Universidad Nacional del Litoral
, Santiago del Estero 2829, S3000AOM Santa Fe, Argentina
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Daniel Pérez-del-Rey
;
Daniel Pérez-del-Rey
3
Instituto de Ciencia Molecular, Universidad de Valencia
, C/Catedrático J. Beltrán 2, 46980 Paterna, Spain
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Henk J. Bolink
;
Henk J. Bolink
3
Instituto de Ciencia Molecular, Universidad de Valencia
, C/Catedrático J. Beltrán 2, 46980 Paterna, Spain
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Javier A. Schmidt
Javier A. Schmidt
a)
1
Instituto de Física del Litoral (IFIS-Litoral), CONICET-UNL
, Güemes 3450, S3000GLN Santa Fe, Argentina
2
Facultad de Ingeniería Química, Universidad Nacional del Litoral
, Santiago del Estero 2829, S3000AOM Santa Fe, Argentina
a)Author to whom correspondence should be addressed: javier.schmidt@santafe-conicet.gov.ar
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a)Author to whom correspondence should be addressed: javier.schmidt@santafe-conicet.gov.ar
Note: This paper is part of the special collection on Hybrid Organic-Inorganic Halide Perovskites
J. Appl. Phys. 127, 235501 (2020)
Article history
Received:
April 22 2020
Accepted:
May 30 2020
Citation
Pedro Hierrezuelo-Cardet, Anderzon F. Palechor-Ocampo, Jorge Caram, Federico Ventosinos, Daniel Pérez-del-Rey, Henk J. Bolink, Javier A. Schmidt; External quantum efficiency measurements used to study the stability of differently deposited perovskite solar cells. J. Appl. Phys. 21 June 2020; 127 (23): 235501. https://doi.org/10.1063/5.0011503
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