Polarization surface-charge density of single semiconductor quantum rods.
Electrostatic force microscopy was used to determine that single CdSe quantum rods (QRs) have a permanent polarization surface-charge density, an unexpected observation for supposedly well-shaped particles. The surface charge results from a slight angle between the QR sides and the direction of internal electric polarization. By contrast, despite the large dipole moment expected for CdSe QRs, none was observed. The unavoidable presence of permanently charged surfaces on CdSe QRs has the potential to impede the development of novel devices incorporating these materials.
Krishnan
Rishikesh
R
Department of Electrical and Computer Engineering, University of Rochester, Rochester, New York 14627, USA.
Hahn
Megan A
MA
Yu
Zhiheng
Z
Silcox
John
J
Fauchet
Philippe M
PM
Krauss
Todd D
TD