Title

Stabilized Perovskite Quantum Dot Solids for Efficient and Stable Optoelectronic Devices

DGIST Authors

Sanghun Han ; Jongmin Choi ; Younghoon Kim

Advisor

최종민

Co-Advisor(s)

Younghoon Kim

Issued Date

2025

Awarded Date

2025-08-01

Type

Thesis

Description

Perovskite quantum dots, Optoelectronic devices, Surface ligands engineering, Triphenylphosphine oxide, Reduced dimensional perovskites

Table Of Contents

List of Contents
Abstract i
List of contents ii
List of tables vi
List of figures v

Ⅰ. Introduction
1.1 Emerging CsPbI3 Perovskite Quantum Dots for Efficient Optoelectronic Devices 1
1.2 Key Factors Determining the Properties of CsPbI3 Perovskite Quantum Dots: Surface Ligands 2
1.3 Limitation of Currently Developed Solid-State Ligand Exchange Process for High-Performing CsPbI3 Perovskite Quantum Dot Solids 3
1.4 Realization of Stabilized CsPbI3 Perovskite Quantum Dot Solids: Using L-type Short Chain Ligands Solution Dissolved in Nonpolar Solvents 4
1.5 Realization of Stabilized CsPbI3 Perovskite Quantum Dot Solids: Using Synergistic Hybrid-Ligands Passivation Strategy 6
1.6 Summary 8

Ⅱ. Results and Discussion
2.1 Stabilized CsPbI3 Perovskite Quantum Dot Solids via Nonpolar Solvent Dispersed L-type short chain Ligand Treatment 11
2.1.1 Limitations in Currently Developed Conventional Ligand Exchange Process 11
2.1.2 Solvent Selection for CsPbI3 Perovskite Quantum Dot Surface Reinforcement Strategy 15
2.1.3 CsPbI3 Perovskite Quantum Dot Surface Reinforcement Strategy Using L-type TPPO Ligand Solution Dissolved in Nonpolar Solvent Octane 20
2.1.4 Optoelectrical Properties and Film Stability of Surface-Reinforced CsPbI3 Perovskite Quantum Dot Solids 25
2.1.5 Photovoltaic Performance and Operational Stability of Surface-Reinforced CsPbI3 Perovskite Quantum Dot Solar Cells 29

2.2 Stabilized CsPbI3 Perovskite Quantum Dot Solids via Synergistic Effects of Hybrid- Ligands Exchange Strategy 35
2.2.1 Generation of Reduced Dimensional Perovskites Within PEAI-Exchanged CsPbI3 Perovskite Quantum Dot Solids 35
2.2.2 Structural and Optical Instability of PEAI-Exchanged CsPbI3 Perovskite Quantum Dot Solids 41
2.2.3 Phase Transition Mechanism of Reduced Dimensional Perovskites Within PEAI-Exchanged CsPbI3 Perovskite Quantum Dot Solids 46
2.2.4 The Roles of Ancillary Ligand TPPO in Suppressing Low-n Reduced Dimensional Perovskites Generation 49
2.2.5 Realizing Stabilized CsPbI3 Perovskite Quantum Dot Solids via Synergistic Effects of Hybrid-Ligands Passivation Strategy 54
2.2.6 Enhanced Optical Properties of PEAI-TPPO-Exchanged CsPbI3 Perovskite Quantum Dot Solids via Synergistic Effects of Hybrid-Ligands Passivation Strategy 61
2.2.7 Performances of Optoelectronic Devices Composed of PEAI-TPPO-Exchanged CsPbI3 Perovskite Quantum Dot Solids 65

Ⅲ. Conclusion 75

Ⅳ. Experimental Section 77

Ⅴ. References 83

URI

https://scholar.dgist.ac.kr/handle/20.500.11750/59782
http://dgist.dcollection.net/common/orgView/200000888619

DOI

10.22677/THESIS.200000888619

Degree

Doctor

Department

Department of Energy Science and Engineering

Publisher

DGIST

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