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

Joep J. H. Pijpers | Zendy; E. Hendry | Zendy; Maaike T.W. Milder | Zendy; Riccardo Fanciulli | Zendy; Janne Savolainen | Zendy; Jennifer L. Herek | Zendy; D. Vanmaekelbergh | Zendy; Sanford Ruhman | Zendy; David Mocatta | Zendy; Dan Oron | Zendy; Assaf Aharoni | Zendy; Uri Banin | Zendy; Mischa Bonn | Zendy

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

Author(s) -

Joep J. H. Pijpers,

E. Hendry,

Maaike T.W. Milder,

Riccardo Fanciulli,

Janne Savolainen,

Jennifer L. Herek,

D. Vanmaekelbergh,

Sanford Ruhman,

David Mocatta,

Dan Oron,

Assaf Aharoni,

Uri Banin,

Mischa Bonn

Publication year - 2008

Publication title -

the journal of physical chemistry c

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.401

H-Index - 289

eISSN - 1932-7455

pISSN - 1932-7447

DOI - 10.1021/jp800834h

Subject(s) - citation , notice , computer science , altmetrics , social media , information retrieval , world wide web , political science , law

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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