Electrically tuning near-field heat flux using metal–oxide–semiconductor structure considering gradient dielectric function distribution

Abstract

We build a model to determine the dependency of near-field heat flux on bias voltage using the metal–oxide–semiconductor structures considering gradient distribution of dielectric function. Quantitative dependency of near-field heat flux exchanged by two biased metal–oxide–semiconductor structures on bias voltage is established. The distribution of carrier density and the resultant dielectric function in the semiconductor layer caused by the bias are determined. The corresponding near-field heat flux is calculated using an effective multilayer model. Significant tuning performance is demonstrated, which is due to the increase or decrease in high-frequency surface polariton states induced by the injection or extraction of major carriers. This work deepens the understanding of electrical control of near-field heat transfer with metal–oxide–semiconductor structures, promising for nanoscale thermal management devices and thermal circuits.

Coupling polaritons in near-field radiative heat transfer between multilayer graphene/vacuum/α-MoO3/vacuum heterostructures

“…[1][2][3] However, the radiative heat transfer can break the black-body limit and exceed the limit by several orders of magnitude when two objects are separated at a distance less than the characteristic thermal wavelength. [4][5][6][7][8][9][10][11] This is mainly due to the contribution of evanescent waves, which significantly influence the near-field radiative heat transfer (NFRHT). [12][13][14][15][16][17] Previous studies have demonstrated NFRHT can be enhanced between materials supporting surface wave resonances and hyperbolic phonon polaritons (HPPs).…”

Enhancement of near-field thermal radiation between composite materials with gradient plasmonic nanoparticles

“…Moreover, there is increasing interest in materials with gradient permittivity, particularly in one-dimensional systems, due to their capacity to enhance heat flux in both near-and far-field thermal applications through unique physical characteristics. [21][22][23] For instance, Zhao et al's study on NFRHT between two gradient permittivity slabs highlights enhanced energy transmission in the lower frequency range, attributed to the red-shift effect of internal polaritons. 21 However, the adjustable parameters of these bulk materials are relatively limited, posing constraints on their flexibility and control.…”