Electroluminescence in a rectifying graphene/InGaN junction

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Abstract

A graphene-InGaN Schottky junction has been successfully fabricated by transferring graphene layers onto n-type In0.23Ga0.77N/GaN/Al2O3 substrates. Current-voltage (I-V) measurement across the junction demonstrates the rectifying behaviour. Temperature dependent I-V characteristics in a range of 10 K to 300 K reveal that the charge transport mechanism is dominated by thermionic emission. Also, it is observed that the charge-transfer induced variation of Fermi energy of graphene affects the flow of current. This graphene/InGaN junction shows electroluminescence (EL) characteristics under a forward bias, producing bright blue emission (430 nm) at room temperature. As the temperature increases, the EL peak is shifted to a lower energy with a reduced peak intensity due to the increased nonradiative recombination rate. The dependence of EL intensity on the current of the graphene/InGaN junction confirms the band-to-band recombination mechanism in the InGaN layer by the bimolecular radiative recombination. Therefore, the observed results provide an insight for implementing graphene based Schottky-junction devices with tunable emission by utilizing the variable bandgap of the InGaN layer.

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APA

Cho, H. D., Yoon, I. T., Yuldashev, S. U., Kang, T. W., Kim, D. Y., & Lee, J. K. (2017). Electroluminescence in a rectifying graphene/InGaN junction. RSC Advances, 7(80), 50853–50857. https://doi.org/10.1039/c7ra10672f

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