Charge trapping and de-trapping in isolated CdSe/ZnS nanocrystals under an external electric field: indirect evidence for a permanent dipole moment. Issue 36 (21st August 2015)

• Record Type: Journal Article
• Authors: Zang, Huidong; Cristea, Mihail; Shen, Xuan; Liu, Mingzhao; Camino, Fernando; Cotlet, Mircea
• Is Part Of: Nanoscale. Volume 7:Issue 36(2015)
• Page Start: 14897
• Page End: 14905
• Publication Date: 2015-08-21
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c5nr03714j
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Single nanocrystal spectroscopy of CdSe/ZnS quantum dots under an external electric field provides evidence of an intrinsic permanent dipole moment. Abstract : Single nanoparticle studies of charge trapping and de-trapping in core/shell CdSe/ZnS nanocrystals incorporated into an insulating matrix and subjected to an external electric field demonstrate the ability to reversibly modulate the exciton dynamics and photoluminescence blinking while providing indirect evidence for the existence of a permanent ground state dipole moment in such nanocrystals. A model assuming the presence of energetically deep charge traps physically aligned along the direction of the permanent dipole is proposed in order to explain the dynamics of nanocrystal blinking in the presence of a permanent dipole moment.