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P-N junction

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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A comprehensive photovoltaic study on tungsten disulfide (WS2) buffer layer based CdTe solar cell.

E I Emon¹, A M Islam¹, M K Sobayel²

¹Department of Electrical and Electronic Engineering, University of Dhaka, Dhaka 1000, Bangladesh.

|March 23, 2023

Summary

Researchers explored tungsten disulfide (WS₂) as a non-toxic buffer layer in Cadmium Telluride (CdTe) solar cells, achieving 20.55% efficiency. This study highlights WS₂ potential for eco-friendly thin-film solar cells.

Keywords:

Buffer layer CdTe Solar cell Numerical study Transition metal di-chalcogenides (TMCDs)Tungsten disulfide (WS2)

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Area of Science:

Materials Science
Photovoltaics
Thin-film Solar Cells

Background:

Transition metal di-chalcogenides like Tungsten disulfide (WS₂) possess excellent optoelectronic properties.
WS₂ is a non-toxic, earth-abundant material with potential for solar cell applications.
Traditional Cadmium Sulfide (CdS) buffer layers in Cadmium Telluride (CdTe) solar cells raise environmental concerns.

Purpose of the Study:

To investigate the potential of WS₂ as an eco-friendly buffer layer in CdTe thin-film solar cells.
To numerically compare the performance of a SnO₂/WS₂/CdTe/Au solar cell with a baseline ITO/ZnO/CdS/CdTe/Au structure.
To analyze the impact of various parameters on solar cell performance.

Main Methods:

Numerical simulation using the SCAPS-1D solar simulator.
Comparative analysis of proposed (SnO₂/WS₂/CdTe/Au) and baseline (ITO/ZnO/CdS/CdTe/Au) solar cell structures.
Investigation of parameters including carrier generation rate, spectral response, I-V characteristics, defect densities, operating temperature, and C-V characteristics.

Main Results:

The proposed SnO₂/WS₂/CdTe/Au solar cell achieved a conversion efficiency of 20.55%.
Defect tolerance levels were determined: 10¹⁷ cm⁻³ for WS₂ bulk and 10¹² cm⁻³ for the WS₂/CdTe interface.
The study identified poor structural robustness and thermal stability in the proposed cell design.

Conclusions:

Tungsten disulfide (WS₂) shows promise as a viable, environmentally friendly, and cost-effective buffer material for CdTe thin-film solar cells.
Further research is needed to address the thermal stability limitations of WS₂ in solar cell devices.
The findings provide insights for fabricating improved CdTe thin-film solar cells.