Size-Dependent Composition and Molar Extinction Coefficient of PbSe Semiconductor Nanocrystals

For these nonstoichiometric PbSe semiconductor nanocrystals, we proposed a new computational approach to calculate the total number of Pb and Se atoms in different sized particles

Quanqin Dai; Yingnan Wang; Xinbi Li; Yu Zhang; Donald J. Pellegrino; Muxun Zhao; Bo Zou; JaeTae Seo; Yiding Wang; William W. Yu

2009

Scholarcy highlights

  • Atomic compositions and molar extinction coefficients of PbSe semiconductor nanocrystals were determined by atomic absorption spectrometry, UV−vis−NIR spectrophotometry, and transmission electron microscopy
  • The Pb/Se atomic ratio was found to be size-dependent with a systematic excess of Pb atoms in the PbSe nanocrystal system
  • Experimental results indicated that the individual PbSe nanocrystal was nonstoichiometric, consisting of a PbSe core and an extra layer of Pb atoms
  • For these nonstoichiometric PbSe semiconductor nanocrystals, we proposed a new computational approach to calculate the total number of Pb and Se atoms in different sized particles
  • PbSe particle sizes collected from the literature versus either the first absorption peak positions or the optical band gaps, and an energy-dispersive spectrum of the PbSe nanocrystal sample produced in Synthesis 3
  • Such files may be downloaded by article for research use

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