State-Resolved Mobility of 1 cm<sup>2</sup>/(Vs) with HgSe Quantum Dot Films
Menglu Chen, Guohua Shen, Philippe Guyot‐Sionnest
Abstract
HgSe colloidal quantum dot films are made by using a hybrid ligand exchange (HgSe/hybrid) in polar inks and compared with the solid-state ligand exchange using ethanedithiol (HgSe/EDT). In both systems, the conductance shows a peak at one-electron filling of the 1Se state and a dip at 2 electrons before filling the 1Pe state. The HgSe/hybrid films show a ∼100-fold increased mobility, reaching up to ∼1 cm2/Vs for 7.5 nm diameter particles. While field effect transistor and Hall measurements give similar carrier density and mobility, the temperature dependence of the mobility is consistent with hopping transport.
Topics & Concepts
Quantum dotColloidConductanceElectronCondensed matter physicsElectron mobilityLigand (biochemistry)PolarMaterials scienceChemistryAnalytical Chemistry (journal)NanotechnologyPhysicsPhysical chemistryChromatographyReceptorBiochemistryAstronomyQuantum mechanicsQuantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsMolecular Junctions and Nanostructures