Controlling Piezoelectric Response in Semiconductor Quantum Dots via Impulsive Charge Localization
- 1 July 2010
- journal article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 10 (8), 3062-3067
- https://doi.org/10.1021/nl101605r
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.Keywords
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