Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7223363 | Optik - International Journal for Light and Electron Optics | 2018 | 7 Pages |
Abstract
In the CZTS structure, ZnMgO alloy can be a promising alternative buffer layer candidate to toxic cadmium sulphide (CdS) material. The effects of conduction band offset (CBO) at ZnMgO/CZTS interface are investigated by numerical approach. The main factor examined is the Mg concentration of ZnMgO and at high values of this parameter, a significantly higher barrier is observed, leading to a distortion in the current-voltage curve (S-shape). This phenomenon caused by degraded open circuit voltage (Voc) and fill factor (FF) parameters leads to overall poor performance. Zn1-xMgxO with 20% Mg concentration decreases maximally the CBO and eliminates the S-shape while increasing the conversion efficiency. The suggested design by ultimately replacing both CdS buffer and ZnO window layers by a single layer of ZnMgO leads to an optimised CZTS based solar cell exhibiting a conversion efficiency of 11.50% with Vocâ¯=â¯0.78â¯V, Jscâ¯=â¯22.37â¯mA/cm² and FFâ¯=â¯66.11%.
Related Topics
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Engineering
Engineering (General)
Authors
A. Bahfir, M. Boumaour, M. Kechouane,