Journal
NANO LETTERS
Volume 13, Issue 11, Pages 5454-5461Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl403033f
Keywords
supercrystals; nanocrystals; band-transport; photoconductivity; metal-insulator transition
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Funding
- Center for Advanced Solar Photophysics (CASP), an Energy Frontier Research Center by OBES, OS, U.S. DOE
- Office of Naval Research (ONR) through the Naval Research Laboratory's Basic Research Program
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A theory of photo- and dark-band conductivities in semiconductor supercrystals consisting of nanocrystals is developed by assuming scattering by structural defects in the supercrystals. A new proposed mechanism of photoexcitation, which is triggered by an efficient Auger ionization of charged nanocrystals, provides explanation for the measured photocurrent being 2-3 orders of magnitude larger than the dark current. For dark conductivity, the metal-insulator transitions and temperature dependence of mobility in the metal phase are considered.
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