Title

Surface Engineering of Nanocrystals for Highly Efficient Optoelectronic Devices

DGIST Authors

Sinyoung Cho ; Jong-Soo Lee ; Weon-Sik Chae

Advisor

이종수

Co-Advisor(s)

Weon-Sik Chae

Issued Date

2025

Awarded Date

2025-02-01

Citation

Sinyoung Cho. (2025). Surface Engineering of Nanocrystals for Highly Efficient Optoelectronic Devices. doi: 10.22677/THESIS.200000839530

Type

Thesis

Description

Nanocrystals, Surface engineering, ZnO, CsPbBr3, Solar cells, QLEDs

Table Of Contents

List of Contents
ABSTRACT. i
List of Contents ii
List of Tables iv
List of Figures v
CHAPTER 1. INTRODUCTION 1
1.1. Nanocrystals & surface engineering 1
1.1.1. Nanocrystals 1
1.1.2. Quantum confinement effect 2
1.2. Surface engineering of nanocrystals 8
1.2.1. Surface chemistry and electronic structure of nanocrystals 8
1.2.2. Surface engineering of nanocrystals 9
1.3. Optoelectronic applications 10
1.3.1. Photovoltaics 10
1.3.2. Light-emitting diodes 14
CHAPTER 2. Solvent Miscibility-Driven Solid-State Ligand Exchange for High-Voltage, Green-Emitting Perovskite Nanocrystal Solar Cells 20
2.1. Introduction 20
2.2. Experimental 23
2.2.1. Materials 23
2.2.2. Synthesis of CsPbBr3 PNCs. 23
2.2.3. CsPbBr3 PNC Solar cell fabrication. 24
2.2.4. Characterization. 25
2.3. Results and discussion. 26
2.4. Conclusion 54
CHAPTER 3. Diverse Exciton Recombination Pathways and Enhanced Stability of Perovskite Nanocrystals through Plasmonic Photonic Crystals 56
3.1. Introduction 56
3.2. Experimental 58
3.2.1. Chemicals. 58
3.2.2. Synthesis of CsPbX3 (X = I or Br) Perovskite NCs 58
3.3. Results and discussion. 61
3.4. Conclusion 81
CHAPTER 4. Surface Passivation of Zinc Oxide Electron Transporting Layer Using Benzoic Acids for High-Efficiency Nanocrystal Light-Emitting Diodes 83
4.1. Introduction 83
4.2. Experimental 84
4.2.1. Materials 84
4.2.2. Surface passivation of ZnO with benzoic acids 85
4.2.3. Device fabrication 85
4.2.4. Characterization 85
4.3. Results and discussion. 86
4.4. Conclusion 95
CHAPTER 5. Conclusions 96
References 99
요 약 문 120

URI

http://hdl.handle.net/20.500.11750/57980
http://dgist.dcollection.net/common/orgView/200000839530

DOI

10.22677/THESIS.200000839530

Degree

Doctor

Department

Department of Energy Science and Engineering

Publisher

DGIST

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