Method for measuring mobility of graphene microcell with semiconductor as substrate

Abstract

The invention provides a method for measuring the mobility of a graphene microcell with a semiconductor as a substrate. The method comprises steps of coating the surface of the semiconductor substrate with graphene to form a graphene microcell and disposing a conductive probe in contact with the graphene microcell; connecting the conductive probe with a scanning Kelvin probe force microscope to measure the actual work function of the graphene microcell to obtain a barrier height [Phi]Bn0 between the graphene microcell and the semiconductor substrate; connecting the conductive probe with a conductive atomic force microscope to collect a current-voltage curve of the graphene microcell; analyzing and fitting the current-voltage curve according to the barrier height [Phi]Bn0 between the graphene microcell and the semiconductor substrate and a hot electron emission model to obtain the effective contact radius of the conductive probe and the graphene microcell; and calculating the value of the graphene microcell mobility [mu] based on the effective contact radius of the conductive probe and the graphene microcell and the actual contact radius. The method can measure the mobility of the graphene microcell with any semiconductor as the substrate.

Description

technical field [0001] The invention relates to the field of graphene micro-domain mobility measurement, in particular to a method for measuring the mobility of graphene micro-domains with a semiconductor as a substrate. Background technique [0002] The magnitude of graphene mobility can directly evaluate the operating frequency and speed of graphene-based devices and circuits. The conventional measurement method of graphene mobility is to cover graphene on a silicon dioxide insulating substrate and use the Hall effect method for measurement. However, in the research on the device application of actual graphene and semiconductor construction, it is found that the mobility of graphene is easily affected by the substrate. In order to obtain the real mobility of graphene as accurately as possible, people usually spread graphene on the hBN substrate which has little influence on the mobility of graphene, because the lattice mismatch between hBN and graphene is only 1.8%. Alte...

AI Technical Summary

Problems solved by technology

However, in practical applications, the substrate of graphene is not limited to hBN. In most cases, graphene is not in a suspended state. Therefore, when graphene is integrated with semiconductors in micro-nano electronic and optoelectronic devices, graphite The influence of semiconductor mobility on ene mobility will be unavoidable

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