Approximate calculation of triboelectric charge density (σ) of nanoscale contact electrification

ABSTRACT

We have analytically approximated the triboelectric charge densities generated by triboelectrification reaching equilibrium over time in contact-mode TENG. It is assumed that the surface density of states (SDOS), N_s(E) is constant. The amount of electron transfer at the interface is estimated by calculating the change in vacuum energy level due to the charge density induced in the upper metal electrode and the lower metal electrode within the nanoscale separation range. Numerical results show that N_s(E) and work function difference are dominant compared to dielectric constant (material property) and dielectric thickness (structure parameter).

KEYWORDS:

• Triboelectric charge density
• surface density of states
• work function difference
• dielectric constant
• dielectric thickness

Funding

This work is supported by the Office of Energy Harvesing and Energy Science in Korea.