Статья

PbTe Colloidal Nanocrystals: Synthesis, Characterization, and Multiple Exciton Generation

James E. MurphyContribution from the Center for Basic Sciences, the National Center for Photovoltaics, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309Matthew C. BeardContribution from the Center for Basic Sciences, the National Center for Photovoltaics, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309Andrew G. NormanContribution from the Center for Basic Sciences, the National Center for Photovoltaics, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309S. P. AhrenkielContribution from the Center for Basic Sciences, the National Center for Photovoltaics, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309Justin C. JohnsonContribution from the Center for Basic Sciences, the National Center for Photovoltaics, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309Pingrong YuContribution from the Center for Basic Sciences, the National Center for Photovoltaics, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309O. I. MićićContribution from the Center for Basic Sciences, the National Center for Photovoltaics, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309Randy J. EllingsonContribution from the Center for Basic Sciences, the National Center for Photovoltaics, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309Arthur J. NozikContribution from the Center for Basic Sciences, the National Center for Photovoltaics, National Renewable Energy Laboratory, Golden, Colorado 80401, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309

2006en

ABI

Аннотация

We report an alternative synthesis and the first optical characterization of colloidal PbTe nanocrystals (NCs). We have synthesized spherical PbTe NCs having a size distribution as low as 7%, ranging in diameter from 2.6 to 8.3 nm, with first exciton transitions tuned from 1009 to 2054 nm. The syntheses of colloidal cubic-like PbSe and PbTe NCs using a PbO "one-pot" approach are also reported. The photoluminescence quantum yield of PbTe spherical NCs was measured to be as high as 52 +/- 2%. We also report the first known observation of efficient multiple exciton generation (MEG) from single photons absorbed in PbTe NCs. Finally, we report calculated longitudinal and transverse Bohr radii for PbS, PbSe, and PbTe NCs to account for electronic band anisotropy. This is followed by a comparison of the differences in the electronic band structure and optical properties of these lead salts.

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Идентификаторы

DOI: 10.1021/ja0574973

Цитирования и источники

Цитирований: 3Использованных источников: 0

Показатели — AkademScholar