Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Limitation of the moisture ingress thanks to encapsulation is a key challenge to improve the lifetime of Perovskite solar cells. The side permeation through sealing materials and interfaces, in a glass/glass encapsulation for example, cannot be neglected[1],[2] because of the rapid degradation rate of Perovskite absorber with few amount of water[3].
The side permeation can be studied using an optical test monitoring the degradation of a Perovskite layer in damp heat conditions[2]. Such a method already described the role of interfaces, particularly those between the sealing material and the glass covers.
In this study, we investigated the degradation rate of a glass/glass encapsulated Perovskite layer depending on the composition of the Perovskite stack, for a given sealing material (Acrylic glue). We chose a transparent architecture which mimics a Perovskite sub-cell in a tandem architecture, with silicon for example. We investigated the role of HTL and ETL regarding the degradation rate of the perovskite due to water side permeation, in damp heat conditions. We highlighted the role of these layers regarding the side permeation and established the important increase of the degradation rate with Perovskite stack including the transport layers ETL and HTL we selected, respectively SnO2 nanoparticles and PTAA polymer. This result highlights the importance of the transport layers, not only regarding the electrical performances, but also to manage the side permeation in an encapsulated device. This method we developed allows the study of alternative transport layers with better characteristics regarding gas permeation as dense layers deposited with vacuum technics.
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