Chemistry Seminar Series: Daniel EspinobarroExport this event to calendar

Thursday, March 29, 2018 — 10:30 AM EDT

Photoluminescent properties of colloidal quantum dots

Daniel Espinobarro
​Lecturer, Faculty of Engineering
University of Chihuahua
Mexico

Thursday, March 29, 2018
10:30 a.m.
C2-361

Abstract:  Colloidal quantum dots (CQDs) are a promising material for novel light sources and solar energy conversion. However, trap states associated with the CQD surface can produce non-radiative charge recombination that significantly reduces device performance. Exciton dynamics and interactions in type II colloidal dots (CQDs) with zinc blende structure were investigated by time-resolved. The exciton-exciton interaction energy for CdSe, CdSe/CdTe and CdSe/CdTe/CdS CQDs was investigated using time-resolved PL (TRPL) and compared with transient absorption (TA). The single exciton recombination dynamics were studied by using a theoretically-calculated as a fitting parameter. Combined rate of the non-radiative process was consistent with the localization of holes into shallow traps by an Auger-mediated process. Also, a Chloride passivation of CdTe resulted in a near-complete suppression of the surface traps, producing a significant enhancement of the optical properties.

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