Abstract
PbSe/CdSe core/shell nanocrystals with quantum yield of 70% were obtained by the “successive ion layer adsorption and reaction” technology in solution. The thickness of the CdSe shell was exactly controlled. A series of spectral red shifts with the CdSe shell growth were observed, which was attributed to the combined effect of the surface polarization and the expansion of carriers’ wavefunctions. The stability of PbSe nanocrystals was tremendously improved with CdSe shells.
Highlights
PbSe/CdSe core/shell nanocrystals with quantum yield of 70% were obtained by the ‘‘successive ion layer adsorption and reaction’’ technology in solution
The stability of PbSe nanocrystals was tremendously improved with CdSe shells
The red shift of absorption and PL spectra depends on several factors including (1) the connection between PbSe and CdSe renders the expansion of the carriers’ wavefunctions out of the core region with different expansion probabilities resulting in the increase of
Summary
Abstract PbSe/CdSe core/shell nanocrystals with quantum yield of 70% were obtained by the ‘‘successive ion layer adsorption and reaction’’ technology in solution. A series of spectral red shifts with the CdSe shell growth were observed, which was attributed to the combined effect of the surface polarization and the expansion of carriers’ wavefunctions. It is difficult to grow CdSe shells upon PbSe cores using typical cadmium oleate anion precursor because of high reaction temperatures needed.
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