CUED Publications database

Delayed electron relaxation in CdTe nanorods studied by spectral analysis of the ultrafast transient absorption

Kriegel, I and Scotognella, F and Soavi, G and Brescia, R and Rodríguez-Fernández, J and Feldmann, J and Lanzani, G and Tassone, F (2016) Delayed electron relaxation in CdTe nanorods studied by spectral analysis of the ultrafast transient absorption. Chemical Physics, 471. pp. 39-45. ISSN 0301-0104

Full text not available from this repository.

Abstract

© 2015 Elsevier B.V. All rights reserved. In transient absorption (TA) spectra, the bleach features originating from state filling are overlapped by their energy-shifted derivatives, arising from excited state energy level shifts. This makes the direct extraction of carrier dynamics from a single-wavelength time-trace misleading. Fitting TA spectra in time, as Gaussian functions and their derivative-like shifted Gaussians, allows to individually extract the real dynamics of both photobleached transitions, and their energy shifts. In CdTe nanorods (NRs) we found a delayed heating of holes due to the release of the large excess energy in the electron relaxation process. The slow hole-trapping process is consistent with a high number of surface trap states in these model NRs. Our results show that only a correct disentanglement of bleaching and energy shift contributions provides a reliable framework to extract the underlying carrier relaxation dynamics, including trapping, non-radiative recombination, and eventually carrier multiplication.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:32
Last Modified: 07 Sep 2017 01:48
DOI: