Interface engineering enhanced near-infrared electroluminescence in an n-ZnO microwire/p-GaAs heterojunction

Author:

Li Jitao1,Li Binghui2,Meng Ming1,Sun Lingling1,Jiang Mingming3ORCID

Affiliation:

1. Zhoukou Normal University

2. Chinese Academy of Sciences

3. Nanjing University of Aeronautics and Astronautics

Abstract

Interface engineering in the fabrication of low-dimensional optoelectronic devices has been highlighted in recent decades to enhance device characteristics such as reducing leakage current, optimizing charge transport, and modulating the energy-band structure. In this paper, we report a dielectric interface approach to realize one-dimensional (1D) wire near-infrared light-emitting devices with high brightness and enhanced emission efficiency. The light-emitting diode is composed of a zinc oxide microwire covered by a silver nanolayer (Ag@ZnO MW), magnesium oxide (MgO) buffer layer, and p-type gallium arsenide (GaAs) substrate. In the device structure, the insertion of a MgO dielectric layer in the n-ZnO MW/p-GaAs heterojunction can be used to modulate the device features, such as changing the charge transport properties, reducing the leakage current and engineering the band alignment. Furthermore, the cladding of the Ag nanolayer on the ZnO MW can optimize the junction interface quality, thus reducing the turn-on voltage and increasing the current injection and electroluminescence (EL) efficiency. The combination of MgO buffer layer and Ag nanolayer cladding can be utilized to achieve modulating the carrier recombination path, interfacial engineering of heterojunction with optimized band alignment and electronic structure in these carefully designed emission devices. Besides, the enhanced near-infrared EL and improved physical contact were also obtained. The study of current transport modulation and energy-band engineering proposes an original and efficient route for improving the device performances of 1D wire-type heterojunction light sources.

Funder

Fundamental Research Funds for the Central Universities

National Natural Science Foundation of China

the Science and Technology Development Plan Project of Henan Province

Key Scientific Research Project of Colleges and Universities in Henan Province

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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