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16. Electrical, structural, morphological and photovoltaic properties of Au/n-Ge heterojunctions using V2O5 interfacial layer.

Author

Henry Thomas, G., Ashok Kumar, A., Kaleemulla, S., and Rajagopal Reddy, V.

Abstract

Influence of vanadium pentoxide (V2O5) interfacial layer on electrical, structural, morphological and photovoltaic properties of the Au/V2O5/n-Ge Schottky diodes is presented. The analysis of morphological properties of the V2O5 thin films on the n-Ge surface using AFM and FESEM with EDS reveals the films are homogeneous. The AFM measurements of V2O5 thin films show a fairly smooth surface with RMS roughness of 2.44 nm. Further, the FESEM with EDS measurements of the V2O5/n-Ge layers evidenced with V, O and Ge elements signifies the presence of V2O5 thin films on the n-Ge substrate. The structural properties of V2O5 deposited on the n-Ge substrate were studied from XRD and Raman measurements. These properties of V2O5 films reveal that the films were highly crystalline with orthorhombic structure and significant diffraction intensity corresponds to V2O5 with various crystal orientations. The electrical properties of the n-Ge heterostructure were studied with and without V2O5 thin interlayer. The Schottky barrier parameters such as barrier height and shunt resistance seem to be superior for the V2O5/n-Ge heterojunction compared to without V2O5 interlayer. The current conduction mechanism of the V2O5/n-Ge heterojunction signifies SCLC current transport process assisted with traps is found to be dominant at the V2O5–Ge interface preferably at large forward bias voltages. Frequency-dependent capacitance and series resistance of the V2O5/n-Ge heterojunction and Au/Ge junction are presented. The photovoltaic property of heterojunction was studied under illumination at 100 mW cm−2 and the studies show a responsivity of 534 mA W−1 at –1 V. In view of these observations, the V2O5 interlayer has demonstrated its effectiveness in tuning the barrier characteristics of metal-Ge Schottky junctions. Its photoresponse to illumination also makes its suitability in solar cell of photovoltaic applications. [ABSTRACT FROM AUTHOR]

Published
2024
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