期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 43, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202105722
关键词
charge transfer; field-effect transistors; negative photoconductivity; oxygen adsorption; pressure; PtSe; (2)
类别
资金
- University of Salerno, Salerno, Italy [ORSA200207, ORSA195727]
- Italian Ministry of University and Research MUR [RINASCIMENTO ARS01_01088]
- Universita degli Studi di Salerno within the CRUI-CARE Agreement
PtSe2 field-effect transistors exhibit p-type electrical conductivity sensitive to temperature and environmental pressure, with positive and negative photoconductivity coexisting under white light. Physisorbed oxygen molecules on the PtSe2 surface act as acceptors, affecting carrier concentration and optical properties through charge transfer mechanisms.
Platinum diselenide (PtSe2) field-effect transistors with ultrathin channel regions exhibit p-type electrical conductivity that is sensitive to temperature and environmental pressure. Exposure to a supercontinuum white light source reveals that positive and negative photoconductivity coexists in the same device. The dominance of one type of photoconductivity over the other is controlled by environmental pressure. Indeed, positive photoconductivity observed in high vacuum converts to negative photoconductivity when the pressure is raised. Density functional theory calculations confirm that physisorbed oxygen molecules on the PtSe2 surface act as acceptors. The desorption of oxygen molecules from the surface, caused by light irradiation, leads to decreased carrier concentration in the channel conductivity. The understanding of the charge transfer occurring between the physisorbed oxygen molecules and the PtSe2 film provides an effective route for modulating the density of carriers and the optical properties of the material.
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