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Home  >  Transactions of NAMP VOL 14

23. DETERMINATION OF ELECTRICAL PARAMETERS AND THICKNESS OPTIMIZATION OF Cu2O/GaSb TANDEM SOLAR CELL USING SCAPS SOFTWARE by Abdu Yunusa and A. Yakubu Volume 14, (January - March, 2021 Issue)
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DETERMINATION OF ELECTRICAL PARAMETERS AND THICKNESS OPTIMIZATION OF Cu2O/GaSb TANDEM SOLAR CELL USING SCAPS SOFTWARE

Abdu Yunusa and A. Yakubu

Department of Physics, Bayero University, Kano. Nigeria.

Kano State Secondary Schools Management Board, Kano. Nigeria.

Abstract

This paper presents a simulation work based on a four-terminal and mechanically stacked double junction tandem solar cell consisting of cuprous oxide (n- Cu2O /p- Cu2O) top p-n junction and Gallium Antimonide (n-GaSb/p-GaSb) bottom p-n junction. This is based on the appropriate band gaps of the materials which make them suitable for solar spectrum absorption. The work is aimed at enhancing the solar spectrum absorption of the n-GaSb/p-GaSb single junction solar cell and also improves on the efficiency of the Cu2O-based solar cells using simulation method. This was achieved using both materials in a tandem structure to form solar cell.  This resulted in the absorption of the solar spectrum in the respective junctions of the proposed tandem cell using the junctions’ cut-off wavelengths. The cell characterization was carried out using computer simulation software SCAPS and optimum performance of the cell was obtained. The work also determined the optimum thickness of the individual junctions corresponding to the highest efficiency of the sub- cells. The n- Cu2O /p- Cu2O top junction was simulated with 1000Wm-2 incident power and obtained highest efficiency of 10.18% at an optimum thickness of 0.07μm. The n-GaSb/p-GaSb junction was simulated as a bottom junction of the tandem solar cell, and it received the solar flux of 622Wm-2 in this structure. The n-GaSb/p-GaSb junction produced highest efficiency of 21.01% at an optimum thickness of 6.0μm. Therefore, the efficiency of the tandem solar cell n- Cu2O /p- Cu2O and n-GaSb/p-GaSb was found to be 31.2%. This result surpassed the theoretical value of the Shockley- Queisser efficiency limit for single junction solar cell of 30%. This was achieved by the combination of the two junctions in the tandem structure, in which the top junction absorbed the high energy photons of the solar flux and reduced the thermalisation effect in the bottom junction while the bottom junction which is the good absorber in the near infrared region absorbed with less thermalisation loss. This result is in agreement with the theoretical value predicted in literature using a combination of similar bandgaps. 

Keywords: photovoltaics, thickness optimization, tandem solar cells, Cu2O, GaSb, SCAPS, Cut-off wavelength

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