Layer-dependent surface potential of phosphorene and anisotropic/layer-dependent charge transfer in phosphorene-gold hybrid system

TL;DR

This study investigates the layer-dependent surface potential and anisotropic charge transfer in phosphorene, revealing how these properties influence interfacial charge dynamics in phosphorene-gold systems, which is crucial for future 2D semiconductor device design.

Contribution

It provides the first direct measurement of layer-dependent surface potential and demonstrates anisotropic, layer-dependent charge transfer in phosphorene-gold hybrids using optical methods.

Findings

Layer-dependent surface potential confirmed experimentally.

Anisotropic, layer-dependent PL quenching observed.

Charge transfer varies with phosphorene layer thickness.

Abstract

The surface potential and the efficiency of interfacial charge transfer are extremely important for designing future semiconductor devices based on the emerging two-dimensional (2D) phosphorene. Here, we directly measured the strongly layer-dependent surface potential of mono- and few-layer phosphorene on gold, which confirms with the reported theoretical prediction. At the same time, we used an optical way - photoluminescence (PL) spectroscopy to probe the charge transfer in phosphorene-gold hybrid system. We firstly observed highly anisotropic and layer-dependent PL quenching in the phosphorene-gold hybrid system, which is attributed to the highly anisotropic/layer-dependent interfacial charge transfer.