Dynamically controllable polarity modulation of MoTe2 field-effect transistors through ultraviolet light and electrostatic activation.

Abstract:

:Energy band engineering is of fundamental importance in nanoelectronics. Compared to chemical approaches such as doping and surface functionalization, electrical and optical methods provide greater flexibility that enables continuous, reversible, and in situ band tuning on electronic devices of various kinds. In this report, we demonstrate highly effective band modulation of MoTe2 field-effect transistors through the combination of electrostatic gating and ultraviolet light illumination. The scheme can achieve reversible doping modulation from deep n-type to deep p-type with ultrafast switching speed. The treatment also enables noticeable improvement in field-effect mobility by roughly 30 and 2 times for holes and electrons, respectively. The doping scheme also provides good spatial selectivity and allows the building of a photo diode on a single MoTe2 flake with excellent photo detection and photovoltaic performances. The findings provide an effective and generic doping approach for a wide variety of 2D materials.

journal_name

Sci Adv

journal_title

Science advances

authors

Wu E,Xie Y,Zhang J,Zhang H,Hu X,Liu J,Zhou C,Zhang D

doi

10.1126/sciadv.aav3430

subject

Has Abstract

pub_date

2019-05-03 00:00:00

pages

eaav3430

issue

5

issn

2375-2548

pii

aav3430

journal_volume

5

pub_type

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