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Investigation of space-charge-limited conduction mechanisms in Fe3O4-Y-FE2O3 based on SIO2/N-type SI substrate / Nik Nadia Aina Nik Zumaihan

In this work, thin films of functionalized Fe3O4-γ-Fe2O3 NPs deposited on n-type Si substrate was formed by self-assembly. The co-precipitation method was involved to synthesis the bare iron oxide NPs and the particles were altered to optimum pH 12 by using NH4OH. Iron oxide NPs were then undergone...

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Main Author: Nik Nadia Aina , Nik Zumaihan
Format: Thesis
Published: 2020
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TJ Mechanical engineering and machinery
Online Access:http://studentsrepo.um.edu.my/12127/1/Nik_Nadia_Aina_Nik_Zumaihan.jpg
http://studentsrepo.um.edu.my/12127/8/nadia.pdf
http://studentsrepo.um.edu.my/12127/
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spelling my.um.stud.121272021-04-20T18:20:07Z Investigation of space-charge-limited conduction mechanisms in Fe3O4-Y-FE2O3 based on SIO2/N-type SI substrate / Nik Nadia Aina Nik Zumaihan Nik Nadia Aina , Nik Zumaihan TJ Mechanical engineering and machinery In this work, thin films of functionalized Fe3O4-γ-Fe2O3 NPs deposited on n-type Si substrate was formed by self-assembly. The co-precipitation method was involved to synthesis the bare iron oxide NPs and the particles were altered to optimum pH 12 by using NH4OH. Iron oxide NPs were then undergone modification process with addition of 0.4 g oleic acid and 1.63 mmol functionalization 4-pentynoic acid. For electrical characterization of self-assembled 4-pentynoic acid functionalized Fe3O4-γ-Fe2O3 NPs on SiO2/n-Si substrate, the charge conduction mechanisms were quantitatively investigated and analyzed through the oxides for different heat treatment temperatures (70-300oC). In this study, the Ohm’s Law and PF emission were intensively investigated to identify the leakage current density of the tested materials using SigmaPlot based on J-E plot data provided. At the lower electric field, the leakage current due to Ohm’s law is the major sources contributing to oxide breakdown at the electrical breakdown field, EB level. On the other hand, the PF emission was identified and analyzed at the higher electric field before the electric breakdown occur. The highest EB was showed by the heat-treated sample of 150oC with values of 2.58×10-3MV/cm approximately at 10-3 A/cm2 and it obeys the Ohm’s law as the slope is near to 1. For dynamic dielectric constant (kr), the sample heated at 200oC showed promising value compared to other temperatures and acquired k-value (7.99) higher than commercial native oxide, SiO2 (3.8-3.9). However, its EB is considered low which limits its performance electrically. Besides, the heat-treated sample of 150oC demonstrated the best outcomes as the leakage current is low (10-3A/cm2), high EB (2.58×10-3MV/cm) and has kr near to k of SiO2 (3.85). 2020-09 Thesis NonPeerReviewed application/pdf http://studentsrepo.um.edu.my/12127/1/Nik_Nadia_Aina_Nik_Zumaihan.jpg application/pdf http://studentsrepo.um.edu.my/12127/8/nadia.pdf Nik Nadia Aina , Nik Zumaihan (2020) Investigation of space-charge-limited conduction mechanisms in Fe3O4-Y-FE2O3 based on SIO2/N-type SI substrate / Nik Nadia Aina Nik Zumaihan. Masters thesis, University of Malaya. http://studentsrepo.um.edu.my/12127/
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Student Repository
url_provider http://studentsrepo.um.edu.my/
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Nik Nadia Aina , Nik Zumaihan
Investigation of space-charge-limited conduction mechanisms in Fe3O4-Y-FE2O3 based on SIO2/N-type SI substrate / Nik Nadia Aina Nik Zumaihan
description In this work, thin films of functionalized Fe3O4-γ-Fe2O3 NPs deposited on n-type Si substrate was formed by self-assembly. The co-precipitation method was involved to synthesis the bare iron oxide NPs and the particles were altered to optimum pH 12 by using NH4OH. Iron oxide NPs were then undergone modification process with addition of 0.4 g oleic acid and 1.63 mmol functionalization 4-pentynoic acid. For electrical characterization of self-assembled 4-pentynoic acid functionalized Fe3O4-γ-Fe2O3 NPs on SiO2/n-Si substrate, the charge conduction mechanisms were quantitatively investigated and analyzed through the oxides for different heat treatment temperatures (70-300oC). In this study, the Ohm’s Law and PF emission were intensively investigated to identify the leakage current density of the tested materials using SigmaPlot based on J-E plot data provided. At the lower electric field, the leakage current due to Ohm’s law is the major sources contributing to oxide breakdown at the electrical breakdown field, EB level. On the other hand, the PF emission was identified and analyzed at the higher electric field before the electric breakdown occur. The highest EB was showed by the heat-treated sample of 150oC with values of 2.58×10-3MV/cm approximately at 10-3 A/cm2 and it obeys the Ohm’s law as the slope is near to 1. For dynamic dielectric constant (kr), the sample heated at 200oC showed promising value compared to other temperatures and acquired k-value (7.99) higher than commercial native oxide, SiO2 (3.8-3.9). However, its EB is considered low which limits its performance electrically. Besides, the heat-treated sample of 150oC demonstrated the best outcomes as the leakage current is low (10-3A/cm2), high EB (2.58×10-3MV/cm) and has kr near to k of SiO2 (3.85).
format Thesis
author Nik Nadia Aina , Nik Zumaihan
author_facet Nik Nadia Aina , Nik Zumaihan
author_sort Nik Nadia Aina , Nik Zumaihan
title Investigation of space-charge-limited conduction mechanisms in Fe3O4-Y-FE2O3 based on SIO2/N-type SI substrate / Nik Nadia Aina Nik Zumaihan
title_short Investigation of space-charge-limited conduction mechanisms in Fe3O4-Y-FE2O3 based on SIO2/N-type SI substrate / Nik Nadia Aina Nik Zumaihan
title_full Investigation of space-charge-limited conduction mechanisms in Fe3O4-Y-FE2O3 based on SIO2/N-type SI substrate / Nik Nadia Aina Nik Zumaihan
title_fullStr Investigation of space-charge-limited conduction mechanisms in Fe3O4-Y-FE2O3 based on SIO2/N-type SI substrate / Nik Nadia Aina Nik Zumaihan
title_full_unstemmed Investigation of space-charge-limited conduction mechanisms in Fe3O4-Y-FE2O3 based on SIO2/N-type SI substrate / Nik Nadia Aina Nik Zumaihan
title_sort investigation of space-charge-limited conduction mechanisms in fe3o4-y-fe2o3 based on sio2/n-type si substrate / nik nadia aina nik zumaihan
publishDate 2020
url http://studentsrepo.um.edu.my/12127/1/Nik_Nadia_Aina_Nik_Zumaihan.jpg
http://studentsrepo.um.edu.my/12127/8/nadia.pdf
http://studentsrepo.um.edu.my/12127/
_version_ 1738506571755814912
score 13.211869

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