Performance analysis of undoped and Mg-doped ZnO/p-Si heterojunction diodes grown by sol–gel technique

Performance analysis of undoped and Mg-doped ZnO/p-Si heterojunction diodes grown by sol–gel... This paper reports the comprehensive analysis on the effect of Mg doping on structural, optical and electrical characteristics of MgxZn1−xO/p-Si heterojunction diodes. In this work, undoped and Mg-doped ZnO thin films were directly synthesized on <100> p-Si (silicon) substrate using sol–gel spin coating method. The structural and optical properties of as-fabricated thin films are analyzed by means of XRD, AFM, SEM, ellipsometer and Photoluminescence spectroscopy. The as-grown films are having polycrystalline nature with preferred growth orientation along (002) direction. Although, no peaks due to Mg doping is exhibited in 5% Mg-doped ZnO thin films, however, due to phase segregation, the additional peaks of MgO phase at (200) and (220) direction has started visible for higher Mg-doped ZnO films. The Grain size of the films is diminished from 42.51 to 28.35 nm for Mg-doping increment from 0 to 15%, where as bandgap of the films is increased from 3.27 to 3.83 eV for same doping variation. Electrical parameters of MgxZn1−xO/p-Si heterojunction diodes are studied after forming large area ohmic contacts of Al/Ti and Al on top of ZnO thin film and bottom of Si layer respectively. The significant electrical parameters of the diodes are calculated from current–voltage characteristics measured by semiconductor parameter analyzer and capacitance–voltage characteristics measured by LCR meter. With very high rectification ratio of 41741 and low reverse saturation current of 1.52 nA, Mg0.1Zn0.9O/Si heterojunction diode has potential to be used in future nanoelectronic devices with wider bandgap. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science: Materials in Electronics Springer Journals

Performance analysis of undoped and Mg-doped ZnO/p-Si heterojunction diodes grown by sol–gel technique

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Publisher
Springer US
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Materials Science; Optical and Electronic Materials; Characterization and Evaluation of Materials
ISSN
0957-4522
eISSN
1573-482X
D.O.I.
10.1007/s10854-017-8486-x
Publisher site
See Article on Publisher Site

Abstract

This paper reports the comprehensive analysis on the effect of Mg doping on structural, optical and electrical characteristics of MgxZn1−xO/p-Si heterojunction diodes. In this work, undoped and Mg-doped ZnO thin films were directly synthesized on <100> p-Si (silicon) substrate using sol–gel spin coating method. The structural and optical properties of as-fabricated thin films are analyzed by means of XRD, AFM, SEM, ellipsometer and Photoluminescence spectroscopy. The as-grown films are having polycrystalline nature with preferred growth orientation along (002) direction. Although, no peaks due to Mg doping is exhibited in 5% Mg-doped ZnO thin films, however, due to phase segregation, the additional peaks of MgO phase at (200) and (220) direction has started visible for higher Mg-doped ZnO films. The Grain size of the films is diminished from 42.51 to 28.35 nm for Mg-doping increment from 0 to 15%, where as bandgap of the films is increased from 3.27 to 3.83 eV for same doping variation. Electrical parameters of MgxZn1−xO/p-Si heterojunction diodes are studied after forming large area ohmic contacts of Al/Ti and Al on top of ZnO thin film and bottom of Si layer respectively. The significant electrical parameters of the diodes are calculated from current–voltage characteristics measured by semiconductor parameter analyzer and capacitance–voltage characteristics measured by LCR meter. With very high rectification ratio of 41741 and low reverse saturation current of 1.52 nA, Mg0.1Zn0.9O/Si heterojunction diode has potential to be used in future nanoelectronic devices with wider bandgap.

Journal

Journal of Materials Science: Materials in ElectronicsSpringer Journals

Published: Jan 2, 2018

References

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