Defect states assisted charge conduction in Au/MoO3¿x/n-Si Schottky barrier diode
PublisherInstitute of Physics (IOP)
Rights accessRestricted access - publisher's policy (embargoed until 2019-12-07)
Role of defect states of thermally evaporated molybdenum trioxide (MoO3-x) on electrical conductivity was investigated via low temperature current–voltage and capacitance–voltage measurements. To clarify the charge transport phenomena through MoO3-x, a 15 nm thin layer of MoO3-x film was used as an interface layer between gold and n-type Silicon (n-Si). The formation of an interface dipole between n-Si and MoO3-x exhibits a rectifying behaviour of Au/MoO3-x/n-Si Schottky barrier diode (SBDs). The rectifying nature of the SBDs shown up to 175 K due to proper electron extraction from valence band to conduction band via the defect states; however at =165 K the rectifying nature was not observed due to insulating behaviour of MoO3-x layer. Oxygen deficiency as a formation of defects was determined by x-ray photoelectron spectroscopy (XPS). Consequences of these defects as a function of current conduction across the MoO3-x was also confirmed by low temperature photoluminescence (PL)measurement.
CitationMahato, S., Voz, C., Biswas, D., Puigdollers, J. Defect states assisted charge conduction in Au/MoO3¿x/n-Si Schottky barrier diode. "Materials Research Express", 7 Desembre 2018, vol. 6, núm. 3, p. 036301-1 / 036301-8
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