High-performance controllable ambipolar infrared phototransistors based on graphene-quantum dot hybrid

TL;DR

This paper reports the development of high-performance, controllable ambipolar infrared phototransistors based on graphene-quantum dot hybrids, demonstrating high responsivity and mobility suitable for flexible, low-cost electronic applications.

Contribution

The authors fabricated and characterized controllable ambipolar graphene-quantum dot hybrid FETs with high responsivity and mobility, enabling new functionalities in infrared photodetection.

Findings

Responsivity reaches ~10^7 A/W near thresholds

Mobility of ~300 cm2V-1s-1 for both carriers

FETs can be switched ON by gate voltages up to ±3.7 V

Abstract

The field effect transistors (FETs) exhibited ultrahigh responsivity (107 A/W) to infrared light with great improvement of mobility in graphene / PbS quantum dot (QD) hybrid. These reported transistors are either unipolar or depletion mode devices. In this paper, we presented and fabricated conveniently-controlled grapheme / PbS QD hybrid FETs. Through the investigation on electric and optoelectronic properties, the ambipolar FETs (normally OFF) can be switched ON by raising gate voltage (VG) up to 3.7 V and -0.8 V in the first and third quadrants. Near these thresholds (VT) each carrier species shows comparable mobility (~ 300 cm2V-1s-1). Photo-responsivity reach ~ 107 A/W near each threshold and it will linearly increases with (VG-VT). These hybrid FETs become strongly competitive candidates for devices in flexible integrated circuits with low cost, large area, low-energy consumption and high performances.