Fabrication and characterization of bendable silicon nanowire thermoelectric devices operating in ambient
- 주제(키워드) 실리콘 나노선 , 열전모듈
- 발행기관 고려대학교 대학원
- 지도교수 김상식
- 발행년도 2017
- 학위수여년월 2017. 2
- 학위구분 박사
- 학과 대학원 전기전자전파공학과
- 원문페이지 131 p
- 실제URI http://www.dcollection.net/handler/korea/000000072091
- 본문언어 영어
- 제출원본 000045897578
초록/요약
Recently, nanotechnology has been applied in the field of thermoelectric generation, which has received significant attention as a promising source of next-generation renewable energy. The usefulness of nanotechnology has come out into the open with studies on thermoelectric characteristics of silicon nanowires (SiNWs). From practical and academic perspectives, the use of SiNWs as a thermoelectric material is of great importance. In this thesis, fabrication and characterization of bendable silicon nanowire thermoelectric devices operating in ambient are explored. In chapter 1, basic properties of thermoelectric devices are introduced and it is also demonstrated why SiNWs and plastic substrate are selected for bendable thermoelectric devices. Based on the SiNWs obtained by top-down methods, fabrication process of bendable thermoelectric modules on plastics is described in chapter 2. In chapter 3, simple and accurate routes to obtain Seebeck voltage and thermal conductivity are discussed. In addition, various enhancement mechanisms for high efficient thermoelectric performance are revealed. Moreover, using pn-module under convex bending, the maximum power factor of 14.2 mW/(m·K2) at room temperature has experimentally been realized. In conclusion, mechanical bendability and enhanced thermoelectric characteristics of SiNWs in ambient indicated that they have sufficient potential for the future self-powered bendable system.
more목차
1. Introduction
1.1. Motivation
1.2. Introduction to thermoelectrics
1.3. Measurements of the thermoelectric characteristics of nanowires
1.4. Strategies to improve thermoelectric properties
1.5. SiNW thermoelectric devices on bendable plastics
2. Experimental Procedures
2.1. Fabrication and transfer methods of SiNWs
2.2. Fabrication of thermoelectric platforms
Basic thermoelectric platform with four electrodes
Length-dependent thermoelectric platform
Gate-structured thermoelectric platform
pn-module thermoelectric platform
3. Results and Discussion
3.1. Thermoelectric measurements of silicon nanowires
3.2. Thermal conductivity of silicon nanowires embedded on thermoelectric platforms
3.3. Length-dependent thermoelectric characteristics of silicon nanowires in the relatively low temperature regime in ambient air
3.4. Field-effect modulation of the thermoelectric characteristics of silicon nanowires
3.5. Bendable thermoelectric generators composed of n-and p-type silicon nanowires
4. Conclusions
References
