Enhancement of dielectric properties of PMMA:TiO2 nanocomposite for organic field effect transistors / Lyly Nyl Ismail

In this thesis, a composite between poly (methyl methacrylate) (PMMA) with titanium dioxide (Ti02) films were synthesized, fabricated and characterized using sol-gel spin coating technique. The dielectric, electrical and physical properties of PMMA:Ti02 nanocomposite films was were investigated, to...

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Main Author:	Ismail, Lyly Nyl
Format:	Thesis
Language:	English
Published:	2015
Subjects:	Production of electricity by direct energy conversion
Online Access:	https://ir.uitm.edu.my/id/eprint/15359/1/TP_LYLY%20NYL%20ISMAIL%20EE%2015_5.pdf
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spelling	my-uitm-ir.153592016-11-16T06:30:35Z Enhancement of dielectric properties of PMMA:TiO2 nanocomposite for organic field effect transistors / Lyly Nyl Ismail 2015 Ismail, Lyly Nyl Production of electricity by direct energy conversion In this thesis, a composite between poly (methyl methacrylate) (PMMA) with titanium dioxide (Ti02) films were synthesized, fabricated and characterized using sol-gel spin coating technique. The dielectric, electrical and physical properties of PMMA:Ti02 nanocomposite films was were investigated, to be used as the dielectric layer in the metal-insulator-semiconductor (MIS) device and organic field effect transistors (OFET) application. The goal of this study is to enhance the dielectric properties of PMMA with the influence of TiC^nanopowder (high-A;) material in the PMMA. Another goal is to overcome the leakage current (tunnelling current) and high operating voltage in MIS and OFET devices. PMMA:TiC>2 nanocomposite dielectric films deposition parameter were optimized resulting in good dielectric, electrical and physical properties. Results from the parameter optimization showed that the dielectric properties of PMMA:Ti02 nanocomposite film, which is focusing on the real permittivity, e\ imaginary permittivity, 6" and capacitance were improved. The real permittivity, e' of PMMA:Ti02 nanocomposite film was 12 and 10 measured at 1 kHz and 1MHz, respectively. These values are higher than pure PMMA film which was 4.6 and 2.9, respectively measured at the same frequency. The capacitance value for PMMA:Ti02 nanocomposite film increased drastically from 296 pF/cm2 (for pure PMMA) to 457 9 o nF/cm . The leakage current density for PMMA:Ti02 nanocomposite film was ~ 10" A/cm2 under small electric field of 0.25 MV/cm is due to the addition of Ti02 nanoparticles. Metal-insulator-semiconductor (MIS) structure was used to investigate the compatibility of PMMA:TiC>2 nanocomposite film to be used as dielectric layer with ZnO and P3HT semiconductor layers. The capacitance-voltage (C-V) characteristics indicated that density of interface of trapped charge was found to be 9 x 109 eV_1cm'2. In addition, the MIS exhibited leakage current of 10"6 A/cm2 at IV and relatively high breakdown voltage (2.05MV/cm). Small hysteresis was observed in C-V and I-V characteristics which were associated with ion drift and polarisation of the PMMA:Ti02 nanocomposite dielectric film. Finally, OFET devices with PMMA:TiC>2 nanocomposite as gate dielectric were demonstrated. The OFET performance proved that PMMA:Ti02 nanocomposite dielectric films were compatible with organic and inorganic semiconductors. Low threshold voltage, VTH was obtained for n-type and p-type OFET was around 2 V and -3 V respectively, due to the increment in the e' and capacitance value of the PMMA:Ti02 nanocomposite dielectric film. The fabricated OFET using PMMA:Ti02 as dielectric layer showed almost comparable characteristics reported by other researcher. 2015 Thesis https://ir.uitm.edu.my/id/eprint/15359/ https://ir.uitm.edu.my/id/eprint/15359/1/TP_LYLY%20NYL%20ISMAIL%20EE%2015_5.pdf text en public phd doctoral Universiti Teknologi MARA Faculty of Electrical Engineering
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Production of electricity by direct energy conversion
spellingShingle	Production of electricity by direct energy conversion Ismail, Lyly Nyl Enhancement of dielectric properties of PMMA:TiO2 nanocomposite for organic field effect transistors / Lyly Nyl Ismail
description	In this thesis, a composite between poly (methyl methacrylate) (PMMA) with titanium dioxide (Ti02) films were synthesized, fabricated and characterized using sol-gel spin coating technique. The dielectric, electrical and physical properties of PMMA:Ti02 nanocomposite films was were investigated, to be used as the dielectric layer in the metal-insulator-semiconductor (MIS) device and organic field effect transistors (OFET) application. The goal of this study is to enhance the dielectric properties of PMMA with the influence of TiC^nanopowder (high-A;) material in the PMMA. Another goal is to overcome the leakage current (tunnelling current) and high operating voltage in MIS and OFET devices. PMMA:TiC>2 nanocomposite dielectric films deposition parameter were optimized resulting in good dielectric, electrical and physical properties. Results from the parameter optimization showed that the dielectric properties of PMMA:Ti02 nanocomposite film, which is focusing on the real permittivity, e\ imaginary permittivity, 6" and capacitance were improved. The real permittivity, e' of PMMA:Ti02 nanocomposite film was 12 and 10 measured at 1 kHz and 1MHz, respectively. These values are higher than pure PMMA film which was 4.6 and 2.9, respectively measured at the same frequency. The capacitance value for PMMA:Ti02 nanocomposite film increased drastically from 296 pF/cm2 (for pure PMMA) to 457 9 o nF/cm . The leakage current density for PMMA:Ti02 nanocomposite film was ~ 10" A/cm2 under small electric field of 0.25 MV/cm is due to the addition of Ti02 nanoparticles. Metal-insulator-semiconductor (MIS) structure was used to investigate the compatibility of PMMA:TiC>2 nanocomposite film to be used as dielectric layer with ZnO and P3HT semiconductor layers. The capacitance-voltage (C-V) characteristics indicated that density of interface of trapped charge was found to be 9 x 109 eV_1cm'2. In addition, the MIS exhibited leakage current of 10"6 A/cm2 at IV and relatively high breakdown voltage (2.05MV/cm). Small hysteresis was observed in C-V and I-V characteristics which were associated with ion drift and polarisation of the PMMA:Ti02 nanocomposite dielectric film. Finally, OFET devices with PMMA:TiC>2 nanocomposite as gate dielectric were demonstrated. The OFET performance proved that PMMA:Ti02 nanocomposite dielectric films were compatible with organic and inorganic semiconductors. Low threshold voltage, VTH was obtained for n-type and p-type OFET was around 2 V and -3 V respectively, due to the increment in the e' and capacitance value of the PMMA:Ti02 nanocomposite dielectric film. The fabricated OFET using PMMA:Ti02 as dielectric layer showed almost comparable characteristics reported by other researcher.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Ismail, Lyly Nyl
author_facet	Ismail, Lyly Nyl
author_sort	Ismail, Lyly Nyl
title	Enhancement of dielectric properties of PMMA:TiO2 nanocomposite for organic field effect transistors / Lyly Nyl Ismail
title_short	Enhancement of dielectric properties of PMMA:TiO2 nanocomposite for organic field effect transistors / Lyly Nyl Ismail
title_full	Enhancement of dielectric properties of PMMA:TiO2 nanocomposite for organic field effect transistors / Lyly Nyl Ismail
title_fullStr	Enhancement of dielectric properties of PMMA:TiO2 nanocomposite for organic field effect transistors / Lyly Nyl Ismail
title_full_unstemmed	Enhancement of dielectric properties of PMMA:TiO2 nanocomposite for organic field effect transistors / Lyly Nyl Ismail
title_sort	enhancement of dielectric properties of pmma:tio2 nanocomposite for organic field effect transistors / lyly nyl ismail
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Electrical Engineering
publishDate	2015
url	https://ir.uitm.edu.my/id/eprint/15359/1/TP_LYLY%20NYL%20ISMAIL%20EE%2015_5.pdf
_version_	1783733377786970112

Enhancement of dielectric properties of PMMA:TiO2 nanocomposite for organic field effect transistors / Lyly Nyl Ismail

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