Supercrystals of CdSe Quantum Dots with High Charge Mobility and Efficient Electron Transfer to TiO2

Supercrystals of CdSe Quantum Dots with High Charge Mobility and Efficient Electron Transfer to TiO2

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 m...

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Veröffentlicht in:ACS nano 2010-03, Vol.4 (3), p.1723-1731
Hauptverfasser: Talgorn, Elise, Abellon, Ruben D, Kooyman, Patricia J, Piris, Jorge, Savenije, Tom J, Goossens, Albert, Houtepen, Arjan J, Siebbeles, Laurens D. A
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container_issue 3
container_start_page 1723
container_title ACS nano
container_volume 4
creator Talgorn, Elise
Abellon, Ruben D
Kooyman, Patricia J
Piris, Jorge
Savenije, Tom J
Goossens, Albert
Houtepen, Arjan J
Siebbeles, Laurens D. A
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%.
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title Supercrystals of CdSe Quantum Dots with High Charge Mobility and Efficient Electron Transfer to TiO2
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