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Interaction of hydrogen impurities with intrinsic point defects at the CuInSe\(_2\)/CdS interface of chalcopyrite-based solar cells

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Abstract

The presence of hydrogen in solar cells based on chalcopyrite CuInSe\(_2\) (CIS) absorbers has been linked with improvements in structural properties and cell performance but also with detrimental reliability issues. A major concern is to understand how hydrogen interacts with the absorber-buffer CIS/CdS heterojunction which is the main building block of a typical thin-film solar cell, with CdS most commonly used as the buffer layer. The present study reports calculations based on density-functional theory that examine the segregation propensity of single hydrogen impurities at the interfacial region of the CIS/CdS heterojunction. Two distinct interface variants of the heterojunction were constructed by joining the polar {112} crystalline planes of the absorber (CIS) and buffer (CdS) lattices. Ordered point defects comprising copper vacancies and cation antisites were created to stabilize the {112} facets. The calculations provide detailed information on the type of configurations that hydrogen impurities can form locally at the CIS/CdS interfaces and their defect association with the stabilizing point defects. Essential aspects of the local electronic structure such as the electron spatial localization and the position of the defect-induced levels were also determined.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The manuscript has no associated data beyond the ones presented. Further data that support the findings of this study are available from the author upon reasonable request.]

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Acknowledgements

The present work was supported with funds from FEDER (Programa Operacional Factores de Competitividade COMPETE) and from FCT-Fundação para a Ciência e Tecnologia (Portugal) under UID/FIS/04564/2016 and PTDC/FIS-MAC/29696/2017. The computing facilities of the Department of Physics of the University of Coimbra were used, including the Navigator cluster at the Laboratory for Advanced Computing.

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Marinopoulos, A.G. Interaction of hydrogen impurities with intrinsic point defects at the CuInSe\(_2\)/CdS interface of chalcopyrite-based solar cells. Eur. Phys. J. B 95, 5 (2022). https://doi.org/10.1140/epjb/s10051-021-00255-z

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  • DOI: https://doi.org/10.1140/epjb/s10051-021-00255-z

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