Carrier Multiplication in CdTe Quantum Dots by Single-photon Timing Spectroscopy
- 18 July 2009
- journal article
- Published by Oxford University Press (OUP) in Chemistry Letters
- Vol. 38 (8), 830-831
- https://doi.org/10.1246/cl.2009.830
Abstract
Carrier multiplication (CM) was observed in CdTe quantum dots (QDs) capped with tetradecylphosphonic acid (TDPA) at hν⁄Eg>2.5 by picosecond single-photon timing spectroscopy, where hν and Eg are the excitation and the band gap energies, and the CM efficiency increased rapidly with the increase of hν⁄Eg. No CM was observed less than the threshold value of hν⁄Eg≈2.5, which is close to that of CdSe QDs. As compared to a previous report by Nair and Bawendi, our result suggests that CM is sensitive to the QD surface conditions.Keywords
This publication has 14 references indexed in Scilit:
- Carrier multiplication yields in PbS and PbSe nanocrystals measured by transient photoluminescencePhysical Review B, 2008
- In Spite of Recent Doubts Carrier Multiplication Does Occur in PbSe NanocrystalsNano Letters, 2008
- On the Absence of Detectable Carrier Multiplication in a Transient Absorption Study of InAs/CdSe/ZnSe Core/Shell1/Shell2 Quantum DotsNano Letters, 2008
- Carrier multiplication yields ofandnanocrystals by transient photoluminescence spectroscopyPhysical Review B, 2007
- High-Efficiency Carrier Multiplication and Ultrafast Charge Separation in Semiconductor Nanocrystals Studied via Time-Resolved PhotoluminescenceThe Journal of Physical Chemistry B, 2006
- PbTe Colloidal Nanocrystals: Synthesis, Characterization, and Multiple Exciton GenerationJournal of the American Chemical Society, 2006
- Effect of electronic structure on carrier multiplication efficiency: Comparative study of PbSe and CdSe nanocrystalsApplied Physics Letters, 2005
- Highly Efficient Multiple Exciton Generation in Colloidal PbSe and PbS Quantum DotsNano Letters, 2005
- High Efficiency Carrier Multiplication in PbSe Nanocrystals: Implications for Solar Energy ConversionPhysical Review Letters, 2004
- Behavior of Lead Sulfide Photocells in the Ultraviolet*Journal of the Optical Society of America, 1958