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High-performance laser power converts for direct-energy applications.

Yudan Gou, Hao Wang, Jun Wang

|October 15, 2022

Summary

High-efficiency six-junction gallium arsenide (GaAs) laser power converters (LPCs) achieve a record 57.7% conversion efficiency. These devices demonstrate stable, high-power output, enabling efficient wireless power transmission.

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Area of Science:

Optoelectronics
Semiconductor Devices
Renewable Energy Conversion

Background:

Laser power converters (LPCs) are crucial for efficient energy transfer.
Advancements in multi-junction solar cell technology are key to improving LPC performance.
High current density tunnel junctions are essential for vertical integration in multi-junction devices.

Purpose of the Study:

To design and fabricate high-efficiency six-junction gallium arsenide (GaAs) laser power converters (LPCs).
To investigate the performance characteristics of LPCs under varying laser power and temperature.
To demonstrate the potential for large-scale arrays and wireless power transmission.

Main Methods:

Fabrication of six-junction GaAs LPCs utilizing p++-AlGaAs:C/n++-AlGaAs:Si:Te (1:2) tunnel junctions.

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Characterization of current-voltage (I-V) properties of 10x10 mm^2 LPCs under different laser power and temperature conditions.

Development and testing of a large-scale array of 100 LPCs (41x46 mm^2) for wireless power transmission.

Main Results:

Achieved a record peak tunneling current density of 1867 A/cm^2 with good thermal stability.
Demonstrated maximum conversion efficiency of 57.7% and maximum output power of 15.4 W.
Attained continuous stable operation at 22.9 W for over 550 hours; developed a 179 W array for 20m wireless transmission.

Conclusions:

The developed six-junction GaAs LPCs exhibit excellent performance, including high conversion efficiency and stable high-power output.
The demonstrated thermal stability and high tunneling current density are critical for device reliability.
The successful development of large-scale arrays shows promise for practical applications in wireless power transfer.