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Current–voltage and capacitance–voltage studies of nanocrystalline CdSe/Au Schottky junction interface
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Current–voltage and capacitance–voltage studies of nanocrystalline CdSe/Au Schottky junction interface
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Journal Article
Current–voltage and capacitance–voltage studies of nanocrystalline CdSe/Au Schottky junction interface
2010
Overview
CdSe nanocrystalline thin films have been synthesized on indium tin oxide (ITO) substrates by an electrodeposition technique. A Schottky junction device in the configuration, ITO/nano-CdSe/Au has been fabricated to study the device interface properties by current (
I
)–voltage (
V
) and capacitance (
C
)–voltage (
V
) measurements and compared with the ITO/bulk-CdSe/Au device. The
I–V
characteristics of the nano-CdSe device shows a series resistance effect and
C–V
characteristics show the presence of surface/interface traps induced by a thin native oxide layer at the nano-CdSe/Au interface and is responsible to the deviation in the ideal Mott–Schottky behavior. The presence of a thin oxide layer on the CdSe nanocrystal surface has been identified from Rutherford backscattering (RBS) spectrometry. The low frequency capacitance response of the nano-CdSe device characteristics are being compared with the bulk device, which confirms the presence of surface/interface states within the band gap of CdSe nanocrystals. Mott–Schottky plots at different frequencies indicate the formation of a Schottky barrier between nano-CdSe and Au junction.
Publisher
Springer Netherlands,Springer Nature B.V
Subject
