Free Charges Produced by Carrier Multiplication in Strongly Coupled PbSe Quantum Dot Films
- 22 September 2011
- journal article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 11 (10), 4485-4489
- https://doi.org/10.1021/nl202915p
Abstract
We show that in films of strongly coupled PbSe quantum dots multiple electron–hole pairs can be efficiently produced by absorption of a single photon (carrier multiplication). Moreover, in these films carrier multiplication leads to the generation of free, highly mobile charge carriers rather than excitons. Using the time-resolved microwave conductivity technique, we observed the production of more than three electron–hole pairs upon absorption of a single highly energetic photon (5.7Eg). Free charge carriers produced via carrier multiplication are readily available for use in optoelectronic devices even without employing any complex donor/acceptor architecture or electric fields.Keywords
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