Synthesis and characterization of CdSe nanocrystals in the presence of butylamine as a capping agent

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• 作者：Nguyen Tam Nguyen Truong (129)
  Woo Kyoung Kim (129)
  Chinho Park (129)
  
• 关键词：Ligand Exchange ; Nanocrystal ; Blue ; shift ; Band Edge ; Photoluminescence Quenching
• 刊名：Korean Journal of Chemical Engineering
• 出版年：2013
• 出版时间：April 2013
• 年：2013
• 卷：30
• 期：4
• 页码：949-954
• 全文大小：727KB
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• 作者单位：Nguyen Tam Nguyen Truong (129)
  Woo Kyoung Kim (129)
  Chinho Park (129)
  
  129. School of Chemical Engineering, Yeungnam University, 214-1 Dae-dong, Gyeongsan, 712-749, Korea
  
• ISSN：1975-7220

文摘

TOPO-capped cadmium selenide (CdSe) nanocrystals of sizes between 3 and 8 nm have been synthesized, and the surface-capping molecule, trioctylphosphine oxide, was replaced by butylamine. The effects of changing the surface ligands of the synthesized CdSe nanocrystals on the structural, optical, and electrical properties were investigated. The shift toward shorter wavelength (higher energy) in the visible range of the optical absorption band edge was observed by UV-Vis spectroscopy, and a blue-shift of the photoluminescence peaks was observed with luminescent quenching. Surface modification was found to cause an increase in the surface energy of nanocrystals, resulting in the improvement in charge carrier separation and cell performance in applications towards bulk hetero-junction solar cells.