期刊
ADVANCED MATERIALS
卷 34, 期 34, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202109521
关键词
all-van-der-Waals contacts; Fermi-level pinning; metal-semiconductor contacts; Schottky barrier; transistors; van der Waals semimetals; work function
类别
资金
- National Natural Science Foundation of China [51991340, 51991342, 51972022, 92163205, 52188101, 52072029]
- National Key Research and Development Program of China [2018YFA0703503]
- Overseas Expertise Introduction Projects for Discipline Innovation [B14003]
- Natural Science Foundation of Beijing Municipality [Z180011]
- Fundamental Research Funds for the Central Universities [FRF-TP-19-025A3]
This study reported a van-der-Waals barrier-free hole contact between p-type tellurene semiconductor and layered 1T'-WS2 semimetal, achieving a zero Schottky barrier height and high field-effect mobility, providing a feasible strategy for eliminating the Schottky barrier of metal-semiconductor contacts.
Ultrathin 2D semiconductor devices are considered to have beyond-silicon potential but are severely troubled by the high Schottky barriers of the metal-semiconductor contacts, especially for p-type semiconductors. Due to the severe Fermi-level pinning effect and the lack of conventional semimetals with high work functions, their Schottky hole barriers are hardly removed. Here, an all-van-der-Waals barrier-free hole contact between p-type tellurene semiconductor and layered 1T '-WS2 semimetal is reported, which achieves a zero Schottky barrier height of 3 +/- 9 meV and a high field-effect mobility of approximate to 1304 cm(2) V-1 s(-1). The formation of such contacts can be attributed to the higher work function of approximate to 4.95 eV of the 1T '-WS2 semimetal, which is in sharp contrast with low work function (4.1-4.7 eV) of conventional semimetals. The study defines an available strategy for eliminating the Schottky barrier of metal-semiconductor contacts, facilitating 2D-semiconductor-based electronics and optoelectronics to extend Moore's law.
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