Fabrication of thin film and metal-organic-metal (MOM) diode using PTAA-tips-pentacene

The organic semiconductors potentially offer attractive characteristics, such as lowtemperature fabrication, flexibility deposition technique, low-cost processing, and lightweight, which can be used as an active component in a wide range of electronic applications. Recently, organic semiconductors h...

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Main Author:	Hoh, Hang Tak
Format:	Thesis
Language:	English English
Published:	2018
Subjects:	TK7800-8360 Electronics
Online Access:	https://eprints.ums.edu.my/id/eprint/38347/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/38347/2/FULLTEXT.pdf
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spelling	my-ums-ep.383472024-03-08T03:45:31Z Fabrication of thin film and metal-organic-metal (MOM) diode using PTAA-tips-pentacene 2018 Hoh, Hang Tak TK7800-8360 Electronics The organic semiconductors potentially offer attractive characteristics, such as lowtemperature fabrication, flexibility deposition technique, low-cost processing, and lightweight, which can be used as an active component in a wide range of electronic applications. Recently, organic semiconductors have gained the attention to facilitate formation of thin film by using solution-processed deposition techniques. The solutionprocessable organic material such as poly(triarylamine) (PTAA) and 6,13- bis(triisopropylsilylethynyl)-pentacene (TIPS-pentacene) have been reported to exhibit low mobilities, which far comparable to that of vacuum-deposited organic semiconductors mainly due to the morphology of thin films. To achieve device performance to a higher level, morphology design and control by varying spin-coating condition such as spin speed is crucial. The MOM diode was designed by forming a PTAA-TIPS-pentacene layer based on the concentration of TIPS-pentacene, i.e. 0 %, 5 %, 10 %, 15 %, and 20 % in PTAA, between the indium tin oxide (ITO) electrode layer and the counter aluminium (Al) metal layer. X-ray diffraction (XRD) patterns revealed that with the intensity of diffraction peak for PTAA was increased by increasing the pentacene molecules in PTAA. This indicated that there is a binder effect between PTAA and TIPS-pentacene enhance the molecule ordering. Furthermore, the current-voltage (I-V) characteristics were measured using Keithley 2400 source meter unit from -10 to + 10 V. Meanwhile, the frequency dependent electrical characteristics were measured using a precision LCR meter in the frequency up to 100 kHz. The turnon voltage varies from 2.16 to 2.48 V depending on the concentration of TIPSpentacene in PTAA semiconductors, respectively. The frequency dependence of the electrical responses is attributed to the distribution density of interface states that could follow the alternating current (AC) signal. Investigation exposed that conductance was strongly dependent on the frequency and bias voltage. The capacitance and series resistance were dependent up to constant value at the low frequency region ( < 1 kHz), but the capacitance and series resistance were independent at high frequencies ( < 100 kHz). The MOM diode showed the positive clamping circuit, where the diode discharges when input voltage in the negative side and charging when input voltage is positive side. In conclusion, blending small molecule organic semiconductors into semiconducting polymer have shown the improvement in electrical properties due to the influence of polymer binding on thin film uniformity and operational stability. 2018 Thesis https://eprints.ums.edu.my/id/eprint/38347/ https://eprints.ums.edu.my/id/eprint/38347/1/24%20PAGES.pdf text en public https://eprints.ums.edu.my/id/eprint/38347/2/FULLTEXT.pdf text en validuser masters Universiti Malaysia Sabah Fakulti Kejuruteraan
institution	Universiti Malaysia Sabah
collection	UMS Institutional Repository
language	English English
topic	TK7800-8360 Electronics
spellingShingle	TK7800-8360 Electronics Hoh, Hang Tak Fabrication of thin film and metal-organic-metal (MOM) diode using PTAA-tips-pentacene
description	The organic semiconductors potentially offer attractive characteristics, such as lowtemperature fabrication, flexibility deposition technique, low-cost processing, and lightweight, which can be used as an active component in a wide range of electronic applications. Recently, organic semiconductors have gained the attention to facilitate formation of thin film by using solution-processed deposition techniques. The solutionprocessable organic material such as poly(triarylamine) (PTAA) and 6,13- bis(triisopropylsilylethynyl)-pentacene (TIPS-pentacene) have been reported to exhibit low mobilities, which far comparable to that of vacuum-deposited organic semiconductors mainly due to the morphology of thin films. To achieve device performance to a higher level, morphology design and control by varying spin-coating condition such as spin speed is crucial. The MOM diode was designed by forming a PTAA-TIPS-pentacene layer based on the concentration of TIPS-pentacene, i.e. 0 %, 5 %, 10 %, 15 %, and 20 % in PTAA, between the indium tin oxide (ITO) electrode layer and the counter aluminium (Al) metal layer. X-ray diffraction (XRD) patterns revealed that with the intensity of diffraction peak for PTAA was increased by increasing the pentacene molecules in PTAA. This indicated that there is a binder effect between PTAA and TIPS-pentacene enhance the molecule ordering. Furthermore, the current-voltage (I-V) characteristics were measured using Keithley 2400 source meter unit from -10 to + 10 V. Meanwhile, the frequency dependent electrical characteristics were measured using a precision LCR meter in the frequency up to 100 kHz. The turnon voltage varies from 2.16 to 2.48 V depending on the concentration of TIPSpentacene in PTAA semiconductors, respectively. The frequency dependence of the electrical responses is attributed to the distribution density of interface states that could follow the alternating current (AC) signal. Investigation exposed that conductance was strongly dependent on the frequency and bias voltage. The capacitance and series resistance were dependent up to constant value at the low frequency region ( < 1 kHz), but the capacitance and series resistance were independent at high frequencies ( < 100 kHz). The MOM diode showed the positive clamping circuit, where the diode discharges when input voltage in the negative side and charging when input voltage is positive side. In conclusion, blending small molecule organic semiconductors into semiconducting polymer have shown the improvement in electrical properties due to the influence of polymer binding on thin film uniformity and operational stability.
format	Thesis
qualification_level	Master's degree
author	Hoh, Hang Tak
author_facet	Hoh, Hang Tak
author_sort	Hoh, Hang Tak
title	Fabrication of thin film and metal-organic-metal (MOM) diode using PTAA-tips-pentacene
title_short	Fabrication of thin film and metal-organic-metal (MOM) diode using PTAA-tips-pentacene
title_full	Fabrication of thin film and metal-organic-metal (MOM) diode using PTAA-tips-pentacene
title_fullStr	Fabrication of thin film and metal-organic-metal (MOM) diode using PTAA-tips-pentacene
title_full_unstemmed	Fabrication of thin film and metal-organic-metal (MOM) diode using PTAA-tips-pentacene
title_sort	fabrication of thin film and metal-organic-metal (mom) diode using ptaa-tips-pentacene
granting_institution	Universiti Malaysia Sabah
granting_department	Fakulti Kejuruteraan
publishDate	2018
url	https://eprints.ums.edu.my/id/eprint/38347/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/38347/2/FULLTEXT.pdf
_version_	1794022715811692544

Fabrication of thin film and metal-organic-metal (MOM) diode using PTAA-tips-pentacene

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