Carrier multiplication and its reduction by photodoping in colloidal InAs quantum dots

J. J.H. Pijpers; E. Hendry; M. T.W. Milder; R. Fanciulli; J. Savolainen; J. L. Herek; D. Vanmaekelbergh; S. Ruhman; D. Mocatta; D. Oron; A. Aharoni; U. Banin; M. Bonn

doi:10.1021/jp066709v

Carrier multiplication and its reduction by photodoping in colloidal InAs quantum dots

J. J.H. Pijpers^*, E. Hendry, M. T.W. Milder, R. Fanciulli, J. Savolainen, J. L. Herek, D. Vanmaekelbergh, S. Ruhman, D. Mocatta, D. Oron, A. Aharoni, U. Banin, M. Bonn

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

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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.

Original language	English
Pages (from-to)	4146-4152
Number of pages	7
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	11
DOIs	https://doi.org/10.1021/jp066709v
State	Published - 22 Mar 2007

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title = "Carrier multiplication and its reduction by photodoping in colloidal InAs quantum dots",

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.",

author = "Pijpers, {J. J.H.} and E. Hendry and Milder, {M. T.W.} and R. Fanciulli and J. Savolainen and Herek, {J. L.} and D. Vanmaekelbergh and S. Ruhman and D. Mocatta and D. Oron and A. Aharoni and U. Banin and M. Bonn",

year = "2007",

month = mar,

day = "22",

doi = "10.1021/jp066709v",

language = "אנגלית",

volume = "111",

pages = "4146--4152",

journal = "Journal of Physical Chemistry C",

issn = "1932-7447",

publisher = "American Chemical Society",

number = "11",

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T1 - Carrier multiplication and its reduction by photodoping in colloidal InAs quantum dots

AU - Pijpers, J. J.H.

AU - Hendry, E.

AU - Milder, M. T.W.

AU - Fanciulli, R.

AU - Savolainen, J.

AU - Herek, J. L.

AU - Vanmaekelbergh, D.

AU - Ruhman, S.

AU - Mocatta, D.

AU - Oron, D.

AU - Aharoni, A.

AU - Banin, U.

AU - Bonn, M.

PY - 2007/3/22

Y1 - 2007/3/22

N2 - 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.

AB - 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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SN - 1932-7447

VL - 111

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EP - 4152

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

IS - 11

ER -

Carrier multiplication and its reduction by photodoping in colloidal InAs quantum dots

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