Degradation of CdTe SC during operation: modeling and experiment

Authors

DOI:

https://doi.org/10.15587/1729-4061.2019.185628

Keywords:

cadmium telluride, solar cell degradation, output parameters, light-emitting diode characteristics

Abstract

The mechanisms of CdTe SС degradation during operation are experimentally studied. Two mechanisms of degradation of such solar cells are identified. The first is the generation of defects in the transition region, which is caused by excess charge carriers and defects. The second is the increase in the back barrier. The study of the current-voltage and voltage-capacitance characteristics of solar cells allowed proposing a model of degradation of solar cells based on CdTe. It is found that the presence of copper in the back contact is associated with better initial efficiency, but also the fastest degradation during operation. In accordance with the proposed model, the occurrence of additional elementary defects as a result of dissociation of three types of point defect complexes (Cui+–2CuCd–)–, (VCd2––Cui+)–, (2CuCd––VTe+)– is explained. Shunting of the n-p heterojunction and phase transformations from the p+-Cu2-xTe side due to electrodiffusion of CuCd– with p-CdTe at the n-CdS/p-CdTe and p-CdTe/p+-Cu2-xTe boundaries is considered. On the other hand, the diffusion of Cui+ (interstitial copper) into the absorber volume is possible. Electrodiffusion of defects from heterojunctions to the absorber volume is possible, which leads to the compensation of effective acceptor centers and a decrease in the lifetime of minority charge carriers and, accordingly, a decrease in Jph. In addition, there is a growth of shunting metal chains along the longitudinal grain boundaries of p-CdTe between n-p and р-р+ heterojunctions and the possibility of appearance of high-resistance phases of the Cu-Te system. The proposed model explains the possibility of occurrence of the р+ –Cu2–δS phase on the CdS/CdTe boundary, which constrains the passage of the photoactive part of the solar spectrum in p-CdTe

Author Biographies

Olexander Bolbas, Research, Design and Technology Institute of Micrography Akademika Pidhornoho lane, 1/60, Kharkiv, 61046

Head of Department

Natalya Deyneko, National University of Civil Defence of Ukraine Chernyshevska str., 94, Kharkiv, Ukraine, 61023

PhD, Associate Professor

Scientific Department on Problems of Civil Defense, Technogenic and Ecological Safety

Sergey Yeremenko, Institute of Public Administration in the Field of Civil Protection Vyshgorodska str., 21, Kyiv, Ukraine, 04074

PhD, Associate Professor

Olena Kyryllova, Odessa National Maritime University Mechnikova str., 34, Odessa, Ukraine, 65029

Doctor of Technical Sciences, Associate Professor, Head of Department

Department of Port Operations and Cargo Handling Technology

Oksana Myrgorod, National University of Civil Defence of Ukraine Chernyshevska str., 94, Kharkiv, Ukraine, 61023

PhD, Associate Professor

Department of Fire Prevention in Settlements

Olexander Soshinsky, National University of Civil Defence of Ukraine Chernyshevska str., 94, Kharkiv, Ukraine, 61023

PhD

Scientific Department on Problems of Civil Defense, Technogenic and Ecological Safety

Nataliya Teliura, O. M. Beketov National University of Urban Economy in Kharkiv Marshala Bazhanova str., 17, Kharkiv, Ukraine, 61002

Senior Lecturer

Department of Environmental Engineering

Nataliia Tsapko, Ukrainian Scientific-Research Institute of Environmental Problems Bakulina str., 6, Kharkiv, Ukraine, 61166

PhD, Associate Professor, Head of Department

International Cooperation and Scientific and Technical Information

Roman Shevchenko, National University of Civil Defence of Ukraine Chernyshevska str., 94, Kharkiv, Ukraine, 61023

PhD, Senior Researcher

Scientific Department on Problems of Civil Defense, Technogenic and Ecological Safety

Yuliia Yurchyk, Research, Design and Technology Institute of Micrography Akademika Pidhornoho lane, 1/60, Kharkiv, 61046

Technological Engineer І Category

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Published

2019-12-02

How to Cite

Bolbas, O., Deyneko, N., Yeremenko, S., Kyryllova, O., Myrgorod, O., Soshinsky, O., Teliura, N., Tsapko, N., Shevchenko, R., & Yurchyk, Y. (2019). Degradation of CdTe SC during operation: modeling and experiment. Eastern-European Journal of Enterprise Technologies, 6(12 (102), 46–51. https://doi.org/10.15587/1729-4061.2019.185628

Issue

Vol. 6 No. 12 (102) (2019): Materials Science

Section

Materials Science

License

Copyright (c) 2019 Olexander Bolbas, Natalya Deyneko, Sergey Yeremenko, Olena Kyryllova, Oksana Myrgorod, Olexander Soshinsky, Nataliya Teliura, Nataliia Tsapko, Roman Shevchenko, Yuliia Yurchyk

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