RETRACTED: Numerical Study of a Solar Cell to Achieve the Highest InGaN Power Conversion Efficiency for the Whole...

Area of Science:

• Materials Science
• Solid-State Physics
• Renewable Energy

Background:

• Early solar cell designs faced efficiency limitations.
• Indium Gallium Nitride (InGaN) offers tunable bandgap properties.
• Carrier concentration and mobility are critical for solar cell performance.

Purpose of the Study:

• To propose a novel solar cell structure utilizing a graded InGaN absorber layer.
• To investigate the impact of carrier concentration-dependent mobility on device efficiency.
• To overcome predicted efficiency limits in solar cell technology.

Main Methods:

• Utilized literature data for p- and n-type carrier concentrations.
• Studied the influence of carrier concentration-dependent mobility.
• Modeled a PiN solar cell structure with a step-graded InGaN bandgap absorber layer.
• Considered piezoelectric polarization and surface recombination effects.

Main Results:

• Achieved efficiencies exceeding the theoretical tandem solar cell limit.
• Determined a current density of 52.95 mA/cm² with over 85% efficiency for the PiN structure.
• Calculated a 65.44% power conversion efficiency considering strain and recombination effects.

Conclusions:

• The proposed InGaN graded bandgap solar cell structure significantly enhances efficiency and photocurrent density.
• The study demonstrates a viable pathway to surpass existing solar cell efficiency benchmarks.
• Optimized carrier concentration and mobility are key to achieving high-performance solar devices.