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Indoor Experimental Assessment of the Efficiency and Irradiance Spot of the Achromatic Doublet on Glass ADG Fresnel Lens for Concentrating Photovoltaics

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Type II GaSb quantum ring solar cells under concentrated sunlight.

Che-Pin Tsai, Shun-Chieh Hsu, Shih-Yen Lin

|June 13, 2014

Summary

Gallium antimonide (GaSb) quantum ring solar cells show improved performance under concentrated sunlight compared to GaAs references. These novel solar cells demonstrate higher short-circuit currents and efficiency at higher light concentrations.

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Area of Science:

Materials Science
Nanotechnology
Renewable Energy

Background:

Quantum rings offer unique electronic and optical properties for advanced solar cell designs.
Type II heterostructures are crucial for efficient charge separation in photovoltaic devices.

Purpose of the Study:

To fabricate and characterize a type II GaSb quantum ring solar cell.
To evaluate its performance under concentrated sunlight and compare it with GaAs reference cells.

Main Methods:

Fabrication of type II GaSb quantum ring solar cells.
Measurement of external quantum efficiency (EQE) and photoluminescence (PL).
Performance testing under varying solar concentration levels.

Main Results:

Extended absorption in the long-wavelength region confirmed by EQE and PL.
Quantum ring devices exhibited 5.1%–9.9% higher short-circuit current than GaAs under concentration.
Open-circuit voltage recovery at higher concentrations led to slightly higher overall efficiency (10.31% vs. 10.29%) for quantum ring cells.

Conclusions:

Type II GaSb quantum ring solar cells show promising performance under concentrated sunlight.
The enhanced absorption and voltage recovery are key advantages for high-concentration applications.
Further development could lead to next-generation high-efficiency solar energy conversion.