Journal
2D MATERIALS
Volume 5, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/aab56a
Keywords
MoTe2; TMDCs; Schottky barriers; 2D materials; low temperature; thermionic emission
Categories
Funding
- European Commission Marie Curie Individual Fellowships [701704]
- EPSRC [EP/J000396/1, EP/K017160/1, EP/K010050/1, EP/G036101/1, EP/M001024/1, EP/M002438/1)]
- Royal Society international Exchanges Scheme [2016/R1]
- Leverhulme trust (grant title Quantum Drums and Room temperature quantum electronics)
- DSTL grant scheme Sensing and Navigation using quantum 2.0 technologies
- Marie Curie Actions (MSCA) [701704] Funding Source: Marie Curie Actions (MSCA)
- EPSRC [EP/G036101/1, EP/M002438/1, EP/K017160/1, EP/K010050/1, EP/J000396/1, EP/M001024/1] Funding Source: UKRI
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The newly emerging class of atomically-thin materials has shown a high potential for the realisation of novel electronic and optoelectronic components. Amongst this family, semiconducting transition metal dichalcogenides (TMDCs) are of particular interest. While their band gaps are compatible with those of conventional solid state devices, they present a wide range of exciting new properties that is bound to become a crucial ingredient in the future of electronics. To utilise these properties for the prospect of electronics in general, and long-wavelength-based photodetectors in particular, the Schottky barriers formed upon contact with a metal and the contact resistance that arises at these interfaces have to be measured and controlled. We present experimental evidence for the formation of Schottky barriers as low as 10 meV between MoTe2 and metal electrodes. By varying the electrode work functions, we demonstrate that Fermi level pinning due to metal induced gap states at the interfaces occurs at 0.14 eV above the valence band maximum. In this configuration, thermionic emission is observed for the first time at temperatures between 40 K and 75 K. Finally, we discuss the ability to tune the barrier height using a gate electrode.
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