Graphene channels interfaced with an array of individual quantum dots

TL;DR

This paper demonstrates interfacing graphene surface guides with semiconductor quantum dots to create a novel optoelectronic system exhibiting unique photo-conductance and fluorescence behaviors.

Contribution

It introduces a new method of integrating quantum dots with graphene channels for potential optoelectronic applications, highlighting the effects of bias and resonator tuning.

Findings

Negative differential photo-conductance observed under illumination

Fluorescence diminishes with increasing bias

Resonator tuning may mitigate fluorescence quenching

Abstract

Surface graphene guides were interfaced with an array of individual semiconductor quantum dots, whose position was commensurate with the optical guide modes. The surface guide served as a channel for a Field Effect Transistor (FET) while the dots were placed within the capacitor formed between the graphene channel and the gate electrode. We report on negative differential photo-related conductance under light and a diminishing fluorescence effect as a function of bias. We suggest that the quenched fluorescence may be hindered, to some degree, by incorporating the QD in a resonator, which is tuned to the emission wavelength.