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 Advjournal_title
Science advancesauthors
Wu E,Xie Y,Zhang J,Zhang H,Hu X,Liu J,Zhou C,Zhang Ddoi
10.1126/sciadv.aav3430subject
Has Abstractpub_date
2019-05-03 00:00:00pages
eaav3430issue
5issn
2375-2548pii
aav3430journal_volume
5pub_type
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