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Issue 8, 2017, Issue in Progress
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Proposition and computational analysis of a kesterite/kesterite tandem solar cell with enhanced efficiency

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Abstract

We propose a dual junction Cu2ZnSnS4/Cu2ZnSnSe4 (kesterite/kesterite) based tandem configuration and analyze its prospect and viability as a solar cell. Cu2ZnSnS4 and Cu2ZnSnSe4, both having the kesterite crystal structure, are used as the main absorbers for the top and bottom of cells, respectively. We optimize the thickness of the absorbers using optoelectronic simulations and investigate the effect of absorber thickness on short circuit current density and open circuit voltage. The optimized thicknesses for peak efficiency are found to be 200 nm and 850 nm for Cu2ZnSnS4 and Cu2ZnSnSe4, respectively. The maximum efficiency of the tandem cell is estimated to be 19.87% including recombination effects such as Shockley–Read–Hall (SRH) and radiative recombination mechanisms. We also investigate the effect of band gap on the performance of the tandem cell and show that a 21.74% efficient tandem cell can be achieved for optimized band gaps. Finally, we report that efficiency could be further enhanced by replacing the CdS buffer layer with eco-friendly ZnS buffer layer and optimizing the tandem structure. The proposition and computational analysis presented in this work may help in achieving higher efficiency kesterite solar cells.

Graphical abstract: Proposition and computational analysis of a kesterite/kesterite tandem solar cell with enhanced efficiency

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Publication details

The article was received on 23 Oct 2016, accepted on 02 Jan 2017 and first published on 17 Jan 2017


Article type: Paper
DOI: 10.1039/C6RA25704F
RSC Adv., 2017,7, 4806-4814
  • Open access: Creative Commons BY license
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    Proposition and computational analysis of a kesterite/kesterite tandem solar cell with enhanced efficiency

    U. Saha and Md. K. Alam, RSC Adv., 2017, 7, 4806
    DOI: 10.1039/C6RA25704F

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