Design and simulation of highly efficient CZTS/CZTSSe based thin-film solar cell

Area of Science:

• Materials Science
• Renewable Energy
• Semiconductor Physics

Background:

• Thin-film solar cells offer an alternative to silicon-based photovoltaics.
• Materials with direct bandgaps exhibit higher sunlight absorption efficiency.
• Copper zinc tin sulfide (CZTS) and its alloys are explored as potential photovoltaic materials.

Purpose of the Study:

• To design and optimize a double-absorber thin-film solar cell using CZTS and CZTSSe.
• To enhance the efficiency of thin-film solar cells through numerical simulation and structural optimization.
• To investigate the potential of CZTS-based materials as a sustainable alternative in photovoltaics.

Main Methods:

• Numerical simulation was employed to design and optimize the solar cell structure.
• The structure involved layers of aluminum-doped zinc oxide, intrinsic zinc oxide, cadmium sulfide, and a CZTS/CZTSSe absorber.
• Optimization involved adjusting layer thicknesses, doping densities, and defect densities, including interfacial layers.

Main Results:

• The optimized double-absorber solar cell achieved a conversion efficiency of 26.31%.
• Key performance metrics included an open-circuit voltage of 0.7669 V, a short-circuit current of 48.57740 mA/cm², and a fill factor of 70.61%.
• The total device thickness was optimized to 2.01 μm.

Conclusions:

• The designed CZTS/CZTSSe double-absorber thin-film solar cell demonstrates high efficiency and potential for commercialization.
• CZTS-based materials show promise as a cost-effective and environmentally friendly alternative to existing thin-film photovoltaic technologies like CdTe.
• The study highlights the importance of optimizing material properties and device architecture for enhanced solar cell performance.