Fabrication of Pt decorated silicon nanowire/carbon nanocomposites and application for solar cells
- 주제(키워드) silicon nanowire , solar cells , core-shell
- 발행기관 고려대학교 대학원
- 지도교수 김동환
- 발행년도 2015
- 학위수여년월 2015. 2
- 학위구분 석사
- 학과 일반대학원 신소재공학과
- 세부전공 신소재공학전공
- 원문페이지 77 p
- 실제URI http://www.dcollection.net/handler/korea/000000058240
- 본문언어 영어
- 제출원본 000045827909
초록/요약
I fabricate vertically aligned silicon nanowire/carbon core-shell nanocomposites by using electroless metal deposition and thermal chemical vapor deposition(CVD). Then Pt was decorated in SiNW/C to make functionalization. In general, foreign shell materials enhance stability of core materials and also may use catalytic properties. In addition to the metal particles can be given functionality. Especially, the carbon coating functionalized the SiNW arrays, which showed excellent electrocatalytic activities for the reduction of triiodide to iodide. Cyclic voltammetry (CV) and electrochemical impedance spectra (EIS) were measured to explain the electrocatalytic activity of carbon shell and Pt decorated SiNW/C. In this study for increasing the e_ciency of DSSCs, we have employed vertically aligned silicon nanowire templates and carbon shell (SiNW/C), decorated with Pt nanoparticles for counter electrode of DSSCs. Pt-decorated SiNW/C core-shell showed enhanced power conversion e_ciency of 9.34% comparable to FTO/Pt counter electrode. We expect that this nanocomposites could be applicable to fuel cell for oxygen reduction reaction (ORR) and reduce dependence of Pt .
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Abstract
Contents
ListofTables
ListofFigures
Chapter 1. Introduction
Chapter 2. Theoretical Background
2.1 Nanostructures
2.1.1 Nanotube
2.1.2 Nanowire
2.2 Solarcellbasic
2.2.1 Operating principle of solar cells
2.2.2 Current-Voltage characteristics
2.2.3 Solarcellsparameters
2.2.4 Lossmechanismofsolarcells
2.3 PrinciplesofDSSCs
2.3.1 Overviewoftheprocesses
2.3.2 DynamicsinDSSCs
Chapter 3. Fabrication and measurement of nanocompos- ites 30
3.1 FabricationofSiNW/C@Pt
3.1.1 SynthesisofSiNW/C
3.1.2 Ptdecoration
3.2 Characterization
3.3 SEM images of as prepared SiNW and SiNW/C nanocomposites
3.4 XPS and EDS analysis of Pt decorated SiNW/C
3.5 TEMimages
3.6 Ramanspectraofnanocomposites
Chapter 4. Device fabrication and performance
4.1 Devicefabrication
4.2 CharacterizationofDSSCs
4.3 Electrocatalytic characterizations
4.3.1 Electrochemical impedance spectroscopy of device
4.3.2 Electrochemical impedance spectroscopy of symmetriccell
4.3.3 Cyclic voltammetry of symmetric cell
4.3.4 Three electrode Cyclic voltammetry
4.4 Deviceperformance
Chapter 5. Conclusion
References
