期刊
ACS NANO
卷 3, 期 6, 页码 1518-1524出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn9001616
关键词
semiconductor nanocrystal; PbSe; size dependence; molar extinction coefficient; composition
类别
资金
- NSF [HRD-0734635, HRD-0630372, ESI-0426328/002]
- NSFC [20773043]
- National Basic Research Program of China [2005CB724400]
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. This calculation played a key role on the accurate determination of the strongly size-dependent extinction coefficient, which followed a power law with an exponent of similar to 2.5.
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