Free charges produced by carrier multiplication in strongly coupled PbSe quantum dot films.
basic_science · Level V
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- Record sourced from PubMed, PMID 21939229.
- Also identified by DOI 10.1021/nl202915p.
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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 (5.7E(g)). 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.