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Lead halide perovskite capped colloidal Nanocrystal ; synthesis, surface modification, and charge transport

Lead halide perovskite capped colloidal Nanocrystal ; synthesis, surface modification, and charge transport
Translated Title
솔벤트에 따른 페로브스카이트와 나노입자 리간드로써의 전기적, 광학적 특성 연구; 솔벤트에 따른 페로브스카이트와 나노입자 리간드로써의 전기적, 광학적 특성 연구
Lim, Wan Jin
DGIST Authors
Lim, Wan Jin; Lee, Jong Soo; Cho, Chang Hee
Lee, Jong Soo
Cho, Chang Hee
Issue Date
Available Date
Degree Date
2015. 2
colloidal nanoparticlesligand exchange from organic to inorganicsolvent effect콜로이드나노입자리간드 치환페로브스카이트
Recently, In field of nanoparticles research, as developing shape control skill, nanoparticles could be given to chance to many applications. Especially semiconducting nanoparticles can apply to diverse fields such as solar cell, transistor, light emitting easily as exploiting nanoparticles. Nanoparticles have specific different properties which related to charge transport by controlling their size or shape of nanoparticles than bulk materials due to become close to packing the nanoparticles on the substrate and smaller than bulk in exciton Bohr radius. Commonly, by increasing nanoparticles size, that can affect to their excited number and low activation energy decrease result in increasing charge transport. We investigated ligand-type exchanged from organic to inorganic to improve charge transfer intensively, besides, improved charge transfer can be influenced by the their ligand length which can be controlled capped from parti-cles size and shape that is distinction of property . Generally, when nanoparticles will be increasing size that easy to connect each other for electron in lattices distance which be given to decrease the hopping number. In order to overcome barriers for jumping electrons in lattice distance, the electron's energy have to absorb high energy so Perovskite materials will help electron mobility in nanoparticle.In this study, firstly, we have synthesized organic capped with PbS, PbSe nanoparticles which is size ~8nm, and then, exchange ligand from organic to inorganic capped with nanoparticles. Secondly, Perovskite was dissolved in different solvent because we want to exploit solvent effect. ⓒ 2015 DGIST
Table Of Contents
1. Introduction 1-- 2. Theoretical back ground 3 -- 2.1 Quantum Dots 3-- 2.1.1. Quantum confinement effect 3-- 2.1.2. Particle size 4-- 2.1.3. Pauli exclusion principle 4-- 2.1.4. Surface chemistry 4-- 2.1.5. Solvent effects 5-- 3. Experiments 6-- 3.1. Synthesis method of Perovskite (CH3NH3PbI3) nanoparticles 6-- 3.2. Synthesis method of PbS nanoparticles 7-- 3.3. Synthesis method of PbSe nanoparticles 7-- 3.4. Synthesis method of ligand exchange PbS nanoparticles 8-- 3.5. Synthesis method of ligand exchange PbSe nanoparticles 8-- 3.6. Device Fabrication 9-- 3.7. Characterization techniques used in this work 10-- 4. Results & Discussion 13-- 4.1. Perovskite (CH3NH3PbI3) synthesis & characterization 13-- 4.2. PbS, PbSe nanoparticles synthesis & characterization 27-- 5. Summary & conclusion 50-- References 51
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