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In Spite of Recent Doubts Carrier Multiplication Does Occur in PbSe Nanocrystals

M. Tuan TrinhOptoelectronic Materials, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands, and School of Chemical and Biomolecular Engineering, Cornell University, 356 Olin Hall, New YorkArjan J. HoutepenOptoelectronic Materials, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands, and School of Chemical and Biomolecular Engineering, Cornell University, 356 Olin Hall, New YorkJuleon M. SchinsOptoelectronic Materials, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands, and School of Chemical and Biomolecular Engineering, Cornell University, 356 Olin Hall, New YorkTobias HanrathOptoelectronic Materials, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands, and School of Chemical and Biomolecular Engineering, Cornell University, 356 Olin Hall, New YorkJorge PirisOptoelectronic Materials, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands, and School of Chemical and Biomolecular Engineering, Cornell University, 356 Olin Hall, New YorkW. KnulstOptoelectronic Materials, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands, and School of Chemical and Biomolecular Engineering, Cornell University, 356 Olin Hall, New YorkAlbert GoossensOptoelectronic Materials, Faculty of Applied Sciences, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands, and School of Chemical and Biomolecular Engineering, Cornell University, 356 Olin Hall, New YorkLaurens D. A. SiebbelesDelft University of Technology

2008en

ABI

Annotatsiya

Efficient carrier multiplication has been reported for several semiconductor nanocrystals: PbSe, PbS, PbTe, CdSe, InAs, and Si. Some of these reports have been challenged by studies claiming that carrier multiplication does not occur in CdSe, CdTe, and InAs nanocrystals, thus raising legitimate doubts concerning the occurrence of carrier multiplication in the remaining materials. Here, conclusive evidence is given for its occurrence in PbSe nanocrystals using femtosecond transient photobleaching. In addition, it is shown that a correct determination of carrier-multiplication efficiency requires spectral integration over the photobleach feature. The carrier multiplication efficiency we obtain is significantly lower than what has been reported previously, and it remains an open question whether it is higher in nanocrystals than it is in bulk semiconductors.

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DOI: 10.1021/nl0807225

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