Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 5, Issue 18, Pages 3169-3174Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz501640f
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Funding
- Robert A. Welch Foundation [F-1464]
- National Science Foundation Industry/University Cooperative Research Center on Next Generation Photovoltaics [IIP-1134849]
- National Science Foundation Graduate Research Fellowship Program [DGE-I1100007]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Division Of Computer and Network Systems
- Direct For Computer & Info Scie & Enginr [1134849] Funding Source: National Science Foundation
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Transient absorption spectroscopy (TAS) was used to study carrier multiplication (CM) (also called multiexciton generation (MEG)) in solvent-dispersed colloidal CuInSe2 nanocrystals with diameters as small as 4.5 nm. Size-dependent carrier cooling rates, absorption cross sections, and Auger lifetimes were also determined. The energy threshold for CM in the CuInSe2 nanocrystals was found to be 2.4 +/- 0.2 times the nanocrystal energy gap (Eg) and the CM efficiency was 36 +/- 6% per unit Eg. This is similar to other types of nanocrystal quantum dot materials.
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