Controlling piezoelectric response in semiconductor quantum dots via impulsive charge localization.
basic_science · Level V
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- Record sourced from PubMed, PMID 20593778.
- Also identified by DOI 10.1021/nl101605r.
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Abstract
By direct observation of coherent acoustic phonons, we demonstrate a novel extrinsic piezoelectric response in colloidal CdSe semiconductor quantum dots. This response is driven by the migration of charges to the surface of the quantum dot on a vibrationally impulsive time scale. Surface- and fluence-dependent studies reveal that the observed carrier capture based piezo response is controllable and is at least an order of magnitude larger than the intrinsic piezo response of wurtzite CdSe.