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Title: Auger-Limited Carrier Recombination and Relaxation in CdSe Colloidal Quantum Wells

Abstract

Using time-resolved photoluminescence spectroscopy, we show that two-exciton Auger recombination dominates carrier recombination and cooling dynamics in CdSe nanoplatelets, or colloidal quantum wells. The electron-hole recombination rate depends only on the number of electron-hole pairs present in each nanoplatelet, and is consistent with a twoexciton recombination process over a wide range of exciton densities. The carrier relaxation rate within the conduction and valence bands also depends only on the number of electron-hole pairs present, apart from an initial rapid decay, and is consistent with the cooling rate being limited by reheating due to Auger recombination processes. These Auger-limited recombination and relaxation dynamics are qualitatively different from the carrier dynamics in either colloidal quantum dots or epitaxial quantum wells. TOC FIGURE:

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Natural Sciences and Engineering Research Council of Canada (NSERC)
OSTI Identifier:
1392115
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physical Chemistry Letters; Journal Volume: 6; Journal Issue: 6
Country of Publication:
United States
Language:
English
Subject:
Auger Recombination; Biexciton; Cadmium Selenide; Carrier Cooling; Colloidal; Nanoplatelet

Citation Formats

Baghani, Erfan, O’Leary, Stephen K., Fedin, Igor, Talapin, Dmitri V., and Pelton, Matthew. Auger-Limited Carrier Recombination and Relaxation in CdSe Colloidal Quantum Wells. United States: N. p., 2015. Web. doi:10.1021/acs.jpclett.5b00143.
Baghani, Erfan, O’Leary, Stephen K., Fedin, Igor, Talapin, Dmitri V., & Pelton, Matthew. Auger-Limited Carrier Recombination and Relaxation in CdSe Colloidal Quantum Wells. United States. doi:10.1021/acs.jpclett.5b00143.
Baghani, Erfan, O’Leary, Stephen K., Fedin, Igor, Talapin, Dmitri V., and Pelton, Matthew. Thu . "Auger-Limited Carrier Recombination and Relaxation in CdSe Colloidal Quantum Wells". United States. doi:10.1021/acs.jpclett.5b00143.
@article{osti_1392115,
title = {Auger-Limited Carrier Recombination and Relaxation in CdSe Colloidal Quantum Wells},
author = {Baghani, Erfan and O’Leary, Stephen K. and Fedin, Igor and Talapin, Dmitri V. and Pelton, Matthew},
abstractNote = {Using time-resolved photoluminescence spectroscopy, we show that two-exciton Auger recombination dominates carrier recombination and cooling dynamics in CdSe nanoplatelets, or colloidal quantum wells. The electron-hole recombination rate depends only on the number of electron-hole pairs present in each nanoplatelet, and is consistent with a twoexciton recombination process over a wide range of exciton densities. The carrier relaxation rate within the conduction and valence bands also depends only on the number of electron-hole pairs present, apart from an initial rapid decay, and is consistent with the cooling rate being limited by reheating due to Auger recombination processes. These Auger-limited recombination and relaxation dynamics are qualitatively different from the carrier dynamics in either colloidal quantum dots or epitaxial quantum wells. TOC FIGURE:},
doi = {10.1021/acs.jpclett.5b00143},
journal = {Journal of Physical Chemistry Letters},
number = 6,
volume = 6,
place = {United States},
year = {Thu Mar 19 00:00:00 EDT 2015},
month = {Thu Mar 19 00:00:00 EDT 2015}
}