Intermixing and Diffusion Impact on CdS/CdTe/p+ Regions (Te or ZnTe)/Cu/Au Solar Cell Interphases

IF 1.5 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Research-ibero-american Journal of Materials Pub Date : 2023-07-03 DOI:10.1590/1980-5373-mr-2022-0477

C. Hernández-Vásquez, M. Albor-Aguilera, J. Flores-Marquez, M. Gonzalez-Trujillo

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Abstract

The polycrystalline CdS/CdTe thin film solar cell is one of the most important photovoltaic devices for cost-effective generation of solar electricity for terrestrial applications. A typical superstrate structure of CdTe solar cell has been studied through current-voltage (J-V) and secondary ion mass spectroscopy (SIMS) measurements. A close correlation between quality of interphases and its photovoltaic efficiency was determined. It was found an improvement of open circuit voltage (V OC ) and efficiency associated to CdS and CdTe thermal treatments, and a reduction of diffusion of S and Cd into CdTe and CdS respectively. An efficiency of 12% has been reached on solar cells with a Te and ZnTe interlayer as part of the back contact. Low diffusion of Cu along absorbent material was observed when Te and ZnTe was used creating a stable back contact along the time. Diffusion and intermixing at each junction SnO 2 :F/CdS, CdS/CdTe and CdTe/Te or ZnTe/Cu/Au was found, establishing limit values of element diffusion along CdTe solar cells.

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