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Effect of surface capping molecules on the electronic structure of CdSe nanocrystal film

The optical band gap and the valence band of CdSe nanocrystals were investigated with respect to surface capping molecules by using photoluminescence and synchrotron photoemission spectroscopy. The optical band gap was shown to be mainly dependent on the size of the molecule controlling the inter-pa...

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Published in:Thin solid films 2006-01, Vol.494 (1), p.207-210
Main Authors: Choi, Hyun-Ju, Yang, Jun-Kyu, Park, Hyung-Ho
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Language:English
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container_title Thin solid films
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description The optical band gap and the valence band of CdSe nanocrystals were investigated with respect to surface capping molecules by using photoluminescence and synchrotron photoemission spectroscopy. The optical band gap was shown to be mainly dependent on the size of the molecule controlling the inter-particle distance; the valence band, however, mainly depended on the chemical bonding nature of the molecule. UV in air and anneal under ultra high vacuum (UHV) were carried out to control the surface capping pyridine content on CdSe nanocrystal films. With UV treated film, a great reduction in the pyridine content was found, but extra oxygen was absorbed onto the naked CdSe surface. The surface absorbed oxygen exerted a strong influence on the electronic structure of CdSe nanocrystal films. This extra oxygen was successfully removed though UHV-anneal, and it was possible to distinguish the effect of oxygen from the effect of surface capping pyridine on the electronic structure of CdSe nanocrystal film. A quantitative relationship between the valence band maximum of CdSe nanocrystal films and the content of surface-absorbed oxygen could be given.
doi_str_mv 10.1016/j.tsf.2005.08.182
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subjects CdSe
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Electron density of states and band structure of crystalline solids
Electron states
Electronic structure
Exact sciences and technology
Materials science
Nanocrystal
Nanocrystalline materials
Nanoscale materials and structures: fabrication and characterization
Physics
Semiconductor compounds
Surface capping molecule
title Effect of surface capping molecules on the electronic structure of CdSe nanocrystal film
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