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Synthesis and Characterizations of Colloidal Perovskite Nanocrystals for Photovoltaic Application

Title
Synthesis and Characterizations of Colloidal Perovskite Nanocrystals for Photovoltaic Application
Translated Title
광전자 소자를 위한 콜로이달 페로브스카이트 나노입자의 합성 및 특성분석
Authors
Lim, Da Hye
Advisor(s)
Lee, Jong Soo
Co-Advisor(s)
Jeong, Nak Cheon
Issue Date
2017
Available Date
2017-08-02
Degree Date
2017. 8
Type
Thesis
Access Rights
The original item will not be provided upon request from the author
Keywords
hot-injection method, Perovskite solar cells, Colloidal quantum dots, Nanowires, Halide exchange,고온-인젝션 방법, 페로브스카이트 태양전지, 양자점, 나노와이어, 할라이드 교환법
Abstract
Recently, all-inorganic perovskite nanomaterials have been studied because of their higher stability than organic-inorganic hybrid perovskite. However, modifying previous method to simpler and finding other all-inorganic perovskite composition are demanded due to its complicate method. Thus, in this work we studied tuning all visible range with cesium lead halide nanocrystals and synthesizing new perovskite composition with different inorganic elements which are not studied before. Nowadays, it is important to develop simple synthesis method to apply luminescence nanoparticle on various application such as light emitting diode and laser. In the first part, we studied halide ion exchange on cesium lead halide perovskite nanocrystals. With halide exchange, we can tune cesium lead brome perovskite which is green emitting nanocrystals to other halide perovskite which emit different color in all visible range with different concentration LiI or LiCl. Halide exchange happens in room temperature within few seconds. Interestingly, reverse reactions also happen when we use LiBr solution. Moreover, Maximum 5 cycles can happen in one sample. Exchanged nanocrystals exhibit very bright luminescence and it has narrow half full with full-with-half-maximum (15-20nm) and their radiative life is 1-16ns. We fabricate photo-detector with cesium lead iodide nanocrystals. It shows high responsibility with light. Therefore, we can check the potential of cesium lead halide perovskite as photo application. Unlike cesium lead halide perovskite nanocrystal, few perovskite nanocrystals which have different compositions have been studied. Therefore, searching new class of perovskite nanocrystals is demanded for various applications. In chapter 2, we firstly synthesized colloidal rubidium lead halide perovskite nanowires. Rubidium lead halide perovskite nanowire has orthorhombic structure and its lengthy is few macro meter. Rubidium lead halide perovskite nanowire strongly absorb the light below 450nm and it shows good responsibility with light. Therefore, we suggest that rubidium lead halide perovskite nanowire can be potential candidate for optoelectronic materials. ⓒ 2017 DGIST
Table Of Contents
Abstract ⅰ-- List of contents iii-- List of figures v-- List of tables vi-- Part1.Room Temperature Interconversion Reactions in Cesium Lead Halide Perovskite Nanocrystals with Tunable Emission 8-- 1 Introduction 9-- 2 Experimental Section 11-- 2.1 Materials 11-- 2.2 Synthesis of CsPbBr3 Nanocrystals (NCs) 11-- 2.2.1 Preparation of Cs-oleate 11-- 2.2.2 Synthesis of CsPbBr3 NCs 11-- 2.3 Anion exchange reactions 12-- 2.3.1 Forward anion exchange reactions 12-- 2.3.2 Reverse anion exchange reactions 12-- 2.4 Fabrication of CsPbI3 NCs photodetector 12-- 2.5 Characterization 13-- 3. Results and Discussion 15-- 4. Summary & Conclusion 33-- 5. Reference 34-- Part2.Solution Synthesis of Colloidal RbPbI3 Orthorhombic Perovskite Nanowires 40-- 1. Introduction 41-- 2. Experimental Section 44-- 2.1. Materials 44-- 2.2. Synthesis of RbPbI3 Nanocrystals (NWs) 44-- 2.2.1 Preparation of Rb-oleate 44-- 2.2.2 Synthesis of RbPbI3 NWs 44-- 2.3. Fabrication of RbPbI3 NWs photodetector 45-- 2.4. Characterization 45-- 3. Results and Discussion 47-- 4. Summary & Conclusion 59-- 5. Reference 60-- 국문요약문 65
URI
http://dgist.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002376725
http://hdl.handle.net/20.500.11750/4100
DOI
10.22677/thesis.2376725
Degree
Master
Department
Energy Systems Engineering
University
DGIST
Related Researcher
  • Author Lee, Jong Soo Multifuntional Nanomaterials & Energy Devices Lab(MNEDL)
  • Research Interests
Files:
Collection:
Emerging Materials ScienceThesesMaster


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