Controlling piezoelectric response in semiconductor quantum dots via impulsive charge localization.
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.
Tyagi
Pooja
P
Department of Chemistry, McGill University, Montreal, Quebec H3A 2K6, Canada.
Cooney
Ryan R
RR
Sewall
Samuel L
SL
Sagar
D M
DM
Saari
Jonathan I
JI
Kambhampati
Patanjali
P