A High Current Density Direct-Current Generator Based on a Moving van der Waals Schottky Diode

Area of Science:

• Materials Science
• Energy Harvesting
• Semiconductor Devices

Background:

• Schottky diodes are traditionally static components in electronics.
• Dynamic applications of Schottky diodes are underexplored.
• Existing mechanical energy harvesters like piezoelectric and triboelectric nanogenerators have limitations.

Purpose of the Study:

• To design and demonstrate a novel moving Schottky diode generator.
• To explore the conversion of mechanical energy into electrical energy using lateral movement.
• To investigate the potential for portable and wearable energy sources.

Main Methods:

• Fabrication of a moving Schottky diode generator using graphene/metal film and semiconductor.
• Utilizing the built-in electric field for carrier separation during lateral movement.
• Characterization of current density, power density, and power conversion efficiency.

Main Results:

• Achieved a high current density output of 40.0 A m⁻².
• Demonstrated power density of 5.25 W m⁻² and 20.8% power conversion efficiency.
• Exhibited excellent flexibility and stability with no degradation after 10,000 cycles.

Conclusions:

• The moving Schottky diode generator effectively converts mechanical energy to electrical energy.
• The device shows significant advantages over existing nanogenerators in terms of output and stability.
• Potential applications include flexible wearable energy sources and powering small electronic devices.