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Numerical analysis of interface properties effects in CdTe/CdS:O thin film solar cell by SCAPS-1D

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Abstract

This paper investigates the influence of the absorber/window junction properties, on performances of CdTe/CdS:O solar cell, using SCAPS-1D package. Considering the case of ideal interfaces, charges transport mechanisms across the solar cell configuration are dominated by the diffusion and thermionic emission theories. We have shown that, with about 50 nm thickness of the absorber surface layer (CdTe1−xSx) and ΔEc at the CdTe/CdS:O interface comprises in the range [− 0.17 eV; 0 eV], an efficiency of about 21.85% can be reached. On the other hand, we obtained 21.77% with interface states density (Nt) in the range of 106–1011 cm−2 and a flat conduction band at absorber/window interface. Further simulations predict that reducing interface states and ΔEc at the absorber/window interface leads to the improvement of the cell efficiency. This improvement is also observed with the increase in the thickness of CdTe1−xSx and CdTe layers up to some values. Efficiency as high as 21.75% was obtained with ΔEc of − 0.1 eV, Nt less than 1010 cm−2 and CdTe bulk absorber thickness of 1.3 µm.

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Acknowledgements

The authors acknowledge the use of SCAPS-1D program developed by Marc Burgelman and colleagues at the University of Gent in all the simulations reported in this paper.

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Authors and Affiliations

  1. Département de Physique, Faculté des Sciences, Université de Yaoundé 1, BP 812, Yaoundé, Cameroun

    A. Teyou Ngoupo & J. M. Ndjaka

  2. Laboratoire des Matériaux et Environnement (LA.M.E), UFR-SEA, Université de Ouagadougou, BP 7021, Ouaga 03, Burkina Faso

    S. Ouédraogo

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  1. A. Teyou Ngoupo
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  2. S. Ouédraogo
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  3. J. M. Ndjaka
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Correspondence to A. Teyou Ngoupo.

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Teyou Ngoupo, A., Ouédraogo, S. & Ndjaka, J.M. Numerical analysis of interface properties effects in CdTe/CdS:O thin film solar cell by SCAPS-1D. Indian J Phys 93, 869–881 (2019). https://doi.org/10.1007/s12648-018-01360-z

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