Atomic models for surface stabilization of cesium lead halide perovskite nanocrystals = 세슘 납 할라이드 페로브스카이트 나노크리스탈의 표면 안정화 모델

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Since the perovskite has an easy solution reaction, a reaction at a low temperature, and a suitable band gap for a solar cell, much research has been conducted on a low-cost, high-efficiency solar cell. Recently, a light emitting material has been reported using all-inorganic perovskite nanocrystals. materials due to the characteristics of narrow half-width maximum, and high photoluminescence quantum efficiency, bandgap control in the entire visible light through the halide composition. However, reduction in efficiency due to heat and moisture is preventing commercialization. Recently, a method of improving the structural stability and the fluorescence efficiency by adding a metal salt has been reported. However, the role of metal salts in stabilization is still unknown. The stabilization of cesium lead halide perovskite nanocrystal surfaces were studied by the first-principle calculation method. Based on the Octet rule, the model of the surface stabilized by the ligand was presented and the thermodynamic stability was compared. It was confirmed that the stable surface varies depending on the chemical environment, and the merging of nanocrystals can be explained. In addition, we can understand the interaction between nanocrystals and ligands by presenting a model of colloidal nanocrystals in comparison with experimental data.
Advisors
Kim, Yong-Hyunresearcher김용현researcher
Description
한국과학기술원 :나노과학기술대학원,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 나노과학기술대학원, 2018.2,[ii, 19 p. :]

Keywords

surface formation energy▼afirst-principle▼aatomic model▼aPerovskite nanocrystals; 표면형성에너지▼a제일원리▼a원자 모델▼a페로브스카이트 나노크리스탈

URI
http://hdl.handle.net/10203/265979
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=733773&flag=dissertation
Appears in Collection
NT-Theses_Master(석사논문)
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