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

Journal Article · Thu Mar 19 04:00:00 EDT 2015 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.5b00143· OSTI ID:1392115

Baghani, Erfan; O’Leary, Stephen K.; Fedin, Igor; Talapin, Dmitri V.; Pelton, Matthew

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:

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: USDOE Office of Science - Office of Basic Energy Sciences; Natural Sciences and Engineering Research Council of Canada (NSERC)
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1392115
• Journal Information: Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 6 Vol. 6; ISSN 1948-7185
• Publisher: American Chemical Society
• Country of Publication: United States
• Language: English

Related Subjects

Auger Recombination
Biexciton
Cadmium Selenide
Carrier Cooling
Colloidal
Nanoplatelet