Light‐Induced Degradation of Perovskite Solar Cells: The Influence of 4‐Tert‐Butyl Pyridine and Gold

Stability is one of the key challenges for industrial scale commercialization of perovskite solar cells. In this work, a degradation mechanism that depends on materials and bias conditions of the device during light‐soaking is proposed. The observed degradation is linked to the additive 4‐tert‐butyl...

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Bibliographic Details
Published in:Advanced energy materials 2018-08, Vol.8 (23), p.n/a
Main Authors: Bastos, João P., Paetzold, Ulrich W., Gehlhaar, Robert, Qiu, Weiming, Cheyns, David, Surana, Supriya, Spampinato, Valentina, Aernouts, Tom, Poortmans, Jef
Format: Article
Language:English
Subjects:
Bias
Commercialization
Gold
light
perovskite solar cells
Perovskites
Photodegradation
Photovoltaic cells
Solar cells
stability
Statistical analysis
Transport
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Summary:Stability is one of the key challenges for industrial scale commercialization of perovskite solar cells. In this work, a degradation mechanism that depends on materials and bias conditions of the device during light‐soaking is proposed. The observed degradation is linked to the additive 4‐tert‐butyl pyridine (tBP), crucial to the hole transport layer of most perovskite solar cells, and gold. This conclusion is reached through the statistical analysis of multiple compositional profiles of light‐soaked and nonlight‐soaked devices and by selective replacement of material layers of the device. Moreover, the rate of the light‐induced degradation is enhanced by operation at forward bias, which is required for power generation. Thus, this work stresses the need for the development of transport layers that do not require tBP, and to replace gold to produce high‐performing devices that are also stable under operating conditions. The additives 4‐tert‐butyl pyridine and gold are shown to reduce the short‐circuit current density of perovskite solar cells under illumination. The reduction of the short‐circuit current density is caused by the increased charge recombination. Moreover, the rate of reduction of the short‐circuit current density is determined by the bias conditions of the perovskite solar cells.
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201800554