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The Study of Thin Film Transistor with Micro An-tenna Structure for Wireless Signal Transmission

Title
The Study of Thin Film Transistor with Micro An-tenna Structure for Wireless Signal Transmission
Translated Title
마이크로 안테나를 가지는 자기 유도 결합 방식 무선 박막트랜지스터 시스템 연구
Authors
Jun, Byoung Ok
DGIST Authors
Jun, Byoung Ok; Jang, Jae Eun; Choi, Hong Soo
Advisor(s)
Jang, Jae Eun
Co-Advisor(s)
Choi, Hong Soo
Issue Date
2015
Available Date
2015-01-12
Degree Date
2015. 2
Type
Thesis
Keywords
Wireless power transmissionA-IGZO TFTWireless TFT무선 전력전송박막트랜지스터무선 박막트랜지스터
Abstract
Wearable and flexible devices have been widely studied. In the flexible display system, thin film transistors (TFTs) are applied as an important building block such like electrical switch, rectifier or amplifier due to its relatively lower process temperature than field effect transistor using single crystal material. Wire connection is employed to supply an electrical power or a driving signal to TFTs. However, the contact electrodes, gen-erally formed by metal thin film, is one of the weakest part, so that it is easily broken in bending or folding situation, since the electrode shape is narrow (~ um level) and long (cm ~ m level) in a row or a column di-rection. Wireless power and signal transfer (WPST) can be a good candidate to solve this problem. Therefore, wireless thin film transistor (TFT) structure has been studied to apply to various flexible or wearable devices. One of the enabling technologies is the near-field magnetic induction coupling [1]. To apply the WPST connection system to TFT for the flexible system, it is essential to realize a receiving antenna with micro-meter level size structure to withstand the bending situation. The side effect of this micro size antenna is the decrease of transmission efficiency as scaling down the size of antenna. To compensate this side effect for employing micro antenna structure to TFT, the magnetic core (MC) is added to the micro antenna structure to increase the magnetic flux without the size change of antenna structure due to the decrease of the power efficiency as the scale down of antenna size. The MC is consisted of zinc oxide nano-wires (ZnO NWs) and nikel (Ni), a ferromagnetic material, which is coated on the vertical ZnO NWs. Due to the increase of self-resonance frequency with decreasing antenna size, we chose an amorphous indium gallium zinc oxide (a-IGZO) TFT, which showed higher mobility than a-Si TFT and optimized the TFT structure for high frequency driving. Then, WPST system is adopted to the a-IGZO TFT and the charancteristics are analyzed. To improve the wireless a-IGZO TFT sysem, various MC structures and a-IGZO TFT designs are studied and applicability of wireless TFT is estimated for the flexible and wearable system in this paper. ⓒ 2015 DGIST
Table Of Contents
Ⅰ. INTRODUCTION 1-- 1.1 Motivation 1-- 1.2 Issues of wireless TFT system 2-- 1.3 Issue of antenna for WPT 3-- 1.3.1 Background and principle of WPT 3-- 1.3.2 Classification of WPT technologies 5-- 1.3.3 Issues of spiral coil based on inductive coupling 7-- 1.3.4 Effect of MC 9-- 1.3.5 Designs of MC 10-- 1.4 Issues of amorphous oxide semiconductor (AOS) TFTs 12-- 1.4.1 Background and principles of AOS TFTs 12-- 1.4.2 Issues of AOS TFT 12-- 1.4.3 Effect of IGZO TFT 16-- Ⅱ. EXPERIMENT DETAILS 18-- 2.1 Fabrication of the micro coil 18-- 2.2 Fabrication of MC structures 19-- 2.3 Fabrication of α-IGZO TFT 24-- 2.4 Fabrication of wireless α-IGZO TFT 26-- 2.5 Measurement systems 27-- Ⅲ. RESULTS AND DISCUSSION 29-- 3.1 Characteristics of α-IGZO TFT 29-- 3.2 Characteristics of wireless source-drain system of α-IGZO TFT 32-- 3.3 Improvement of α-IGZO TFT 34-- 3.4 Improvement of MC 38-- 3.5 Improvement of wireless source-drain system of α-IGZO TFT 39-- 3.6 Characteristics of wireless gate system of α-IGZO TFT 40-- IV. CONCLUSION 43
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001921606
http://hdl.handle.net/20.500.11750/1396
DOI
10.22677/thesis.1921606
Degree
Master
Department
Information and Communication Engineering
University
DGIST
Files:
Collection:
Information and Communication EngineeringThesesMaster


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