Multifunctional 2D CuSe monolayer nanodevice

TL;DR

This study uses first-principles calculations to explore the electronic, transport, and optical properties of a newly synthesized CuSe monolayer, revealing its potential for multifunctional nanodevices.

Contribution

It provides the first theoretical analysis of CuSe monolayer's electronic transport and photoelectronic properties, highlighting its multifunctionality.

Findings

Strong electrical anisotropy in CuSe ML

Negative differential resistance beyond 1.0 V bias

Large photon absorption to orange light

Abstract

In a very recent experimental work [Gao et al., 2018 Adv. Mater. 30, 1707055], a graphene-like CuSe monolayer was realized. Motivated by this success, we performed first-principles calculations to investigate its electronic transport and photoelectronic properties. We find that the CuSe ML shows a strong electrical anisotropy, and its current-voltage (I-V) curves along the zigzag and armchair directions are noticeably different. The CuSe ML also displays a useful negative differential resistance (NDR) effect along the both directions when the bias is beyond 1.0 V. Moreover, it has a large photon absorption to orange light. Our study suggests that CuSe ML is a multifunctional material and has various potential applications in electrical-anisotropy-based, NDR-based, and even optical nanodevices.