Related papers: Electric imaging and dynamics of photo-charged graphene edge

Electric imaging and dynamics of photo-charged graphene edge

URL: http://arxiv.org/abs/2409.14942v1
Date: Mon, 23 Sep 2024 11:53:08 GMT
Title: Electric imaging and dynamics of photo-charged graphene edge
Authors: Zhe Ding, Zhousheng Chen, Xiaodong Fan, Weihui Zhang, Jun Fu, Yumeng Sun, Zhi Cheng, Zhiwei Yu, Kai Yang, Yuxin Li, Xing Liu, Pengfei Wang, Ya Wang, Jianhua Jiang, Hualing Zeng, Changgan Zeng, Guosheng Shi, Fazhan Shi, Jiangfeng Du,
Abstract summary: Real-space scanning maps of floating graphene flakes were acquired with a spatial resolution of $sim$ 10 nm. Real-time tracing of electric fields detected the photo-thermionic emission process and the recombination process of the emitted electrons. This study provides a new perspective for graphene-based one-dimensional gates and opto-electronics with nanoscale real-space imaging.
Score: 20.52088793247724
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: The one-dimensional side gate based on graphene edges shows a significant capability of reducing the channel length of field-effect transistors, further increasing the integration density of semiconductor devices. The nano-scale electric field distribution near the edge provides the physical limit of the effective channel length, however, its imaging under ambient conditions still lacks, which is a critical aspect for the practical deployment of semiconductor devices. Here, we used scanning nitrogen-vacancy microscopy to investigate the electric field distribution near edges of a single-layer-graphene. Real-space scanning maps of photo-charged floating graphene flakes were acquired with a spatial resolution of $\sim$ 10 nm, and the electric edge effect was quantitatively studied by analyzing the NV spin energy level shifts due to the electric Stark effect. Since the graphene flakes are isolated from external electric sources, we brought out a theory based on photo-thermionic effect to explain the charge transfer from graphene to oxygen-terminated diamond probe with a disordered distribution of charge traps. Real-time tracing of electric fields detected the photo-thermionic emission process and the recombination process of the emitted electrons. This study provides a new perspective for graphene-based one-dimensional gates and opto-electronics with nanoscale real-space imaging, and moreover, offers a novel method to tune the chemical environment of diamond surfaces based on optical charge transfer.

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