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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Supercrystals of CdSe quantum dots with high charge mobility and efficient electron transfer to TiO2
ACS Nano, Volume 4, No. 3, Year 2010
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Description
Thermal annealing of thin films of CdSe/CdS core/shell quantum dots induces superordering of the nanocrystals and a significant reduction of the interparticle spacing. This results in a drastic enhancement of the quantum yield for charge carrier photogeneration and the charge carrier mobility. The mobile electrons have a mobility as high as 0.1 cm2/(V · s), which represents an increase of 4 orders of magnitude over non-annealed QD films and exceeds existing literature data on the electron mobility in CdSe quantum dot films. The lifetime of mobile electrons is longer than that of the exciton. A fraction of the mobile electrons gets trapped at levels below the conduction band of the CdSe nanocrystals. These electrons slowly diffuse over 50-300 nm on longer times up to 20 μs and undergo transfer to a TiO2 substrate. The yield for electron injection in TiO2 from both mobile and trapped electrons is found to be > 16%. © 2010 American Chemical Society.
Authors & Co-Authors
Kooyman, Patricia J.
Netherlands, Delft
Delft University of Technology
Savenije, Tom J.
Netherlands, Delft
Delft University of Technology
Statistics
Citations: 63
Authors: 2
Affiliations: 1
Identifiers
Doi:
10.1021/nn901709a
ISSN:
1936086X