Piezoelectric monolayers as nonlinear energy harvesters

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Hexagonal boron nitride (h-BN) monolayers possess unique mechanical and electrical properties.
• Nonlinear dynamics are crucial for efficient energy harvesting.
• Vibration energy harvesting offers a sustainable power source for nanoscale devices.

Purpose of the Study:

• To investigate the nonlinear dynamics of h-BN monolayers.
• To explore the potential of h-BN monolayers in nonlinear vibration energy harvesting.
• To quantify the electrical power generation capabilities of h-BN based harvesters.

Main Methods:

• Ab-initio calculations to determine the deformation potential energy of h-BN monolayers.
• Numerical solution of a Langevin-type equation to model system dynamics.
• Application of compressive strain to induce a nonlinear bistable regime.

Main Results:

• Quasi-harmonic vibrations combined with low-frequency swings in a double-well potential were observed.
• The intrinsic piezoelectric response of h-BN enables electrical power generation.
• A 20 nm² device is predicted to harvest up to 0.18 pW for a 5 pN noisy vibration.

Conclusions:

• Engineered nonlinearity in h-BN monolayers facilitates efficient vibration energy harvesting.
• h-BN monolayers show promise as active components in nanoscale piezoelectric harvesters.
• The study demonstrates a pathway for developing practical h-BN based energy harvesting devices.