PbTe Colloidal Nanocrystals: Synthesis, Characterization, and Multiple Exciton Generation
National Renewable Energy Laboratory · University of Colorado Boulder
Abstract
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…
Citation impact
- FWCI
- 25.03
- Percentile
- 100%
- References
- 30
Authors
9- JEJames E. MurphyCorresponding
National Renewable Energy Laboratory, University of Colorado Boulder
- MCMatthew C. Beard
National Renewable Energy Laboratory, University of Colorado Boulder
- AGAndrew G. Norman
University of Colorado Boulder, National Renewable Energy Laboratory
- SPS. P. Ahrenkiel
University of Colorado Boulder, National Renewable Energy Laboratory
- JCJustin C. Johnson
University of Colorado Boulder, National Renewable Energy Laboratory
Topics & keywords
- Nanocrystal
- Exciton
- Chemistry
- Photoluminescence
- Characterization (materials science)
- Bohr model
- Yield (engineering)
- Quantum yield