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Cited by 195

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Carrier Multiplication and Its Reduction by Photodoping in Colloidal InAs Quantum Dots

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Pijpers, J. J. H., Hendry, E., Milder, M. T. W., Fanciulli, R., Savolainen, J., Herek, J. L., Vanmaekelbergh, D., Ruhman, S., Mocatta, D., Oron, D., Aharoni, A., Banin, U., Bonn, M.·2007·The Journal of Physical Chemistry C
DOI 10.1021/jp066709v
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Abstract

Carrier (exciton) multiplication in colloidal InAs/CdSe/ZnSe core−shell quantum dots (QDs) is investigated using terahertz time-domain spectroscopy, time-resolved transient absorption, and quasi-continuous wave excitation spectroscopy. For excitation by high-energy photons (∼2.7 times the band gap energy), highly efficient carrier multiplication (CM) results in the appearance of multi-excitons, amounting to ∼1.6 excitons per absorbed photon. Multi-exciton recombination occurs within tens of picoseconds via Auger-type processes. Photodoping (i.e., photoinjection of an exciton) of the QDs prior to excitation results in a reduction of the CM efficiency to ∼1.3. This exciton-induced reduction of CM efficiency can be explained by the twofold degeneracy of the lowest conduction band energy level. We discuss the implications of our findings for the potential application of InAs QDs as light absorbers in solar cells.

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Authors
Pijpers, J. J. H., Hendry, E., Milder, M. T. W., Fanciulli, R., Savolainen, J., Herek, J. L., Vanmaekelbergh, D., Ruhman, S., Mocatta, D., Oron, D., Aharoni, A., Banin, U., & Bonn, M.
Venue
The Journal of Physical Chemistry C
Publisher
American Chemical Society (ACS)
Published
2007-02-08
Volume
111
Issue
11
Pages
4146-4152
ISSN
  • 1932-7447 (ISSN-L)
  • 1932-7455
DOI
10.1021/jp066709v
OpenAlex
W2001757265
Cited by
195
References
0
FWCI
11.88
Type
journal article
Language
en
Open access
green

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