中国物理B ›› 1999, Vol. 8 ›› Issue (1): 40-45.doi: 10.1088/1004-423X/8/1/007

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

ORGANOMETALLIC SYNTHESIS AND QUANTUM SIZE EFFECT OF CdSe NANOCRYSTALLITES

黄宏彬, 徐岭, 陈红明, 黄信凡, 陈坤基, 冯端   

  1. State Key Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
  • 收稿日期:1998-06-15 出版日期:1999-01-20 发布日期:1999-01-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos.19674028 and 69890225).

ORGANOMETALLIC SYNTHESIS AND QUANTUM SIZE EFFECT OF CdSe NANOCRYSTALLITES

Huang Hong-bin (黄宏彬), Xu Ling (徐岭), Chen Hong-ming (陈红明), Huang Xin-fan (黄信凡), Chen Kun-ji (陈坤基), Feng Duan (冯端)   

  1. State Key Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
  • Received:1998-06-15 Online:1999-01-20 Published:1999-01-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos.19674028 and 69890225).

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摘要： We have prepared nearly monodisperse CdSe nanocrystallites with diameters of 1-4 nm from the rapid pyrolysis of organometallic precursors in a hot coordinating solvent. The nanocrystal structures have been characterized by transmission electron microscopy and electron diffraction. From the absorption spectrum, we have observed the prominent peak of 1S-1S excitonic transition, which is obviously blue-shifted from the bulk bandgap and the largest shift is about 1.25 eV. We have used a theoretical model based on the tight binding approximation to analyze the quantum size effect of these nanocrystallites. The results have been compared with those of the effective mass approximation model.

Abstract: We have prepared nearly monodisperse CdSe nanocrystallites with diameters of 1-4 nm from the rapid pyrolysis of organometallic precursors in a hot coordinating solvent. The nanocrystal structures have been characterized by transmission electron microscopy and electron diffraction. From the absorption spectrum, we have observed the prominent peak of 1S-1S excitonic transition, which is obviously blue-shifted from the bulk bandgap and the largest shift is about 1.25 eV. We have used a theoretical model based on the tight binding approximation to analyze the quantum size effect of these nanocrystallites. The results have been compared with those of the effective mass approximation model.

中图分类号:  (Electronic structure of nanoscale materials and related systems)

  • 73.22.-f
81.16.Be (Chemical synthesis methods) 61.05.J- (Electron diffraction and scattering) 71.20.Nr (Semiconductor compounds) 71.15.Ap (Basis sets (LCAO, plane-wave, APW, etc.) and related methodology (scattering methods, ASA, linearized methods, etc.)) 73.21.-b (Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems)