Graphene-based autonomous pyroelectric system for near-field energy conversion

Area of Science:

• Condensed Matter Physics
• Nanotechnology
• Energy Harvesting

Background:

• Evanescent electromagnetic fields near hot solids contain significant energy density.
• Existing near-field energy harvesting methods have limitations in efficiency and applicability to low-grade heat.

Purpose of the Study:

• To introduce a novel many-body conversion principle for harvesting near-field electromagnetic energy.
• To demonstrate the efficacy of graphene-based pyroelectric conversion devices for this purpose.

Main Methods:

• Development of graphene-based pyroelectric conversion devices with an active layer between graphene field-effect transistors.
• Control of the active layer's thermal state and spontaneous polarization using gate bias voltage at kHz frequencies.
• Utilizing pyroelectric Ericsson cycles for energy conversion.

Main Results:

• Achieved a power density of [Formula: see text].
• Demonstrated a performance exceeding near-field thermophotovoltaic devices by over three orders of magnitude.
• Successfully operated with low-grade heat sources and small temperature differences ([Formula: see text]).

Conclusions:

• Graphene-based pyroelectric converters offer a highly efficient method for harvesting near-field thermal energy.
• This technology significantly advances the potential for utilizing low-grade heat sources for power generation.
• The developed devices represent a breakthrough in near-field energy conversion technology.