The electroluminescent properties based on bias polarity of the epitaxial graphene/aluminium SiC junction

TL;DR

This study explores the electroluminescent behavior of epitaxial graphene/SiC junctions, revealing bias polarity effects, temperature dependence, and spectral shifts, with potential for tunable LED applications.

Contribution

It provides new insights into the bias polarity-dependent electroluminescence of graphene/SiC junctions and explains spectral shifts via the Franz-Keldysh effect.

Findings

Electroluminescence observed at both bias polarities.

Spectral blue shift explained by Franz-Keldysh effect.

Temperature influences electroluminescent intensity and spectra.

Abstract

We investigated the electroluminescent properties of the epitaxial graphene/SiC junction. The temperature and current dependence of electroluminescence from the epitaxial graphene/SiC is measured within a temperature range of 50-300 K. The result of electroluminescence at 300~K is compared with the electroluminescent spectra from aluminium/SiC junction. The difference between the spectra is explained by the different band bending, which could lead to the tunable LED due to the semi-metal character of the graphene. We observed the electroluminescence at both bias polarities and we described the blue shift in the spectra by Franz-Keldysh effect.