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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Ultrafast dynamics of multiple exciton harvesting in the CdSe-ZnO system: Electron injection versus auger recombination
Nano Letters, Volume 12, No. 12, Year 2012
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Description
We study multiple electron transfer from a CdSe quantum dot (QD) to ZnO, which is a prerequisite for successful utilization of multiple exciton generation for photovoltaics. By using ultrafast time-resolved spectroscopy we observe competition between electron injection into ZnO and quenching of multiexcitons via Auger recombination. We show that fast electron injection dominates over biexcitonic Auger recombination and multiple electrons can be transferred into ZnO. A kinetic component with time constant of a few tens of picoseconds was identified as the competition between injection of the second electron from a doubly excited QD and a trion Auger recombination. Moreover, we demonstrate that the multiexciton harvesting efficiency changes significantly with QD size. Within a narrow QD diameter range from 2 to 4 nm, the efficiency of electron injection from a doubly excited QD can vary from 30% to 70% in our system. © 2012 American Chemical Society.
Authors & Co-Authors
Žídek, Karel
Sweden, Lund
Lunds Universitet
Zheng, Kaibo
Sweden, Lund
Lunds Universitet
Abdellah, Mohamed A.
Sweden, Lund
Lunds Universitet
Lenngren, Nils
Sweden, Lund
Lunds Universitet
Chábera, Pavel
Sweden, Lund
Lunds Universitet
Pullèrits, Tönu T.
Sweden, Lund
Lunds Universitet
Statistics
Citations: 77
Authors: 6
Affiliations: 1
Identifiers
Doi:
10.1021/nl303746d
ISSN:
15306992