Graphene/Quantum Dot Heterostructure Photodetectors: From Material to Performance

Abstract

Owing to its high carrier mobility, electrical conductivity, and thermal/chemical stability, graphene is an ideal candidate material for photodetection. However, the weak light absorption of graphene significantly limits its practical applications in photodetectors. Quantum dots, with strong light-absorption capacity and well-adjustable band gap, are widely hybridized with graphene to realize wide-range and intense light absorption for effective photodetection. A detailed literature review on graphene/quantum dot heterostructure photodetectors is in urgent need to clearly point out the fundamentals, material synthesis methods, and performance engineering strategies. Here, first, the significance of graphene/quantum dot heterostructure photodetectors, from the mechanism to performance indicators, is systematically discussed. Second, different synthesis methodologies for the graphene/quantum dot heterostructure are overviewed. Additionally, the engineering strategies, including surface treatment, chemical doping, and size modification, to tune the photoelectric performance are critically commented. Finally, challenges and outlook for the development of graphene/quantum dot heterostructure photodetectors are pointed out.

Colloidal quantum dots and two‐dimensional material heterostructures for photodetector applications

“…CdS QDs (bandgap is 1.7–2.4 eV) are also used to decorate 2D graphene to establish a heterostructure for visible PD applications 67 . Chan et al 125 .…”

High-sensitivity hybrid MoSe2/AgInGaS quantum dot heterojunction photodetector

“…However, these devices face a challenge due to the presence of high-toxicity elements which limit their practical application. 4 Hence, it is essential to explore alternative eco-friendly QDs possessing comparable characteristics in the photodetectors. So, low-toxicity QDs with a wide emission spectrum, tunable bandgap energy ranging from visible to near-infrared, and large Stokes shifts have emerged as promising alternatives to cadmium and lead-based QDs.…”

Two‐Step Sequential Process for Fabricating Graphene Nanosheets Decorated with Copper Halide Nanocrystals and Their Optoelectronic Applications

“…Diverse nanoscale materials with specific functionalities, such as exceptional electrical and optical properties, [6][7][8] have been designed or discovered for both academic research and industrial applications. [9][10][11] Inorganic lead halide nanocrystals with exceptional optical and electronic properties are garnering interest as key components in a variety of optical, optoelectronic, catalytic, and imaging applications. [12][13][14] Many researchers have been interested in the synthesis of lead halide perovskite nanocrystals.…”