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Controlling Piezoelectric Response in Semiconductor Quantum Dots via Impulsive Charge Localization

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Pooja Tyagi, Ryan R. Cooney, Samuel L. Sewall, D. M. Sagar, Jonathan I. Saari and Patanjali Kambhampati*

Department of Chemistry, McGill University, Montreal, Quebec H3A 2K6, Canada

Nano Lett., 2010, 10 (8), pp 3062–3067

DOI: 10.1021/nl101605r

Publication Date (Web): July 1, 2010

* Author to whom correspondence should be addressed, pat.kambhampati@mcgill.ca.

Section:

Electric Phenomena

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:

Coherent phonons; quantum dots; piezoelectricity; femtosecond spectroscopy

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Citing Articles

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This article has been cited by 2 ACS Journal articles (2 most recent appear below).

Colloidal Quantum Dots: Think Outside the (Particle-in-a-)Box
Kathryn E. Knowles, Matthew T. Frederick, Daniel B. Tice, Adam J. Morris-Cohen, and Emily A. Weiss
The Journal of Physical Chemistry Letters2012 3 (1), 18-26
- Colloidal Quantum Dots: Think Outside the (Particle-in-a-)Box
  Kathryn E. Knowles, Matthew T. Frederick, Daniel B. Tice, Adam J. Morris-Cohen, and Emily A. Weiss
  The Journal of Physical Chemistry Letters2012 3 (1), 18-26
  This Perspective discusses recent work on mechanisms by which organic ligands affect the electronic structure and exciton dynamics of colloidal quantum dots (QDs). Much of the work described here uses some combination of steady-state absorption, transient ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Hot Exciton Relaxation Dynamics in Semiconductor Quantum Dots: Radiationless Transitions on the Nanoscale
Patanjali Kambhampati
The Journal of Physical Chemistry C2011 115 (45), 22089-22109
- Hot Exciton Relaxation Dynamics in Semiconductor Quantum Dots: Radiationless Transitions on the Nanoscale
  Patanjali Kambhampati
  The Journal of Physical Chemistry C2011 115 (45), 22089-22109
  The ability to confine electrons and holes in semiconductor quantum dots (QDs) in the form of excitons creates an electronic structure which is both novel and potentially useful for a variety of applications. Upon optical excitation of the dot, the ...
  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links