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Optical determination of crystal phase in semiconductor nanocrystals

Title
Optical determination of crystal phase in semiconductor nanocrystals
Authors
Lim, Sung JunSchleife, AndreSmith, Andrew M.
DGIST Authors
Lim, Sung Jun
Issue Date
2017-05-17
Citation
Nature Communications, 8
Type
Article
Article Type
Article
Keywords
Augmented Wave MethodCdSe NanocrystalsCdTe NanocrystalsClustersEmissionEnergyPrecursorQuantum DotsSeeded GrowthSurface
ISSN
2041-1723
Abstract
Optical, electronic and structural properties of nanocrystals fundamentally derive from crystal phase. This is especially important for polymorphic II-VI, III-V and I-III-VI 2 semiconductor materials such as cadmium selenide, which exist as two stable phases, cubic and hexagonal, each with distinct properties. However, standard crystallographic characterization through diffraction yields ambiguous phase signatures when nanocrystals are small or polytypic. Moreover, diffraction methods are low-throughput, incompatible with solution samples and require large sample quantities. Here we report the identification of unambiguous optical signatures of cubic and hexagonal phases in II-VI nanocrystals using absorption spectroscopy and first-principles electronic-structure theory. High-energy spectral features allow rapid identification of phase, even in small nanocrystals (∼2 nm), and may help predict polytypic nanocrystals from differential phase contributions. These theoretical and experimental insights provide simple and accurate optical crystallographic analysis for liquid-dispersed nanomaterials, to improve the precision of nanocrystal engineering and improve our understanding of nanocrystal reactions. © 2017 The Author(s).
URI
http://hdl.handle.net/20.500.11750/4175
DOI
10.1038/ncomms14849
Publisher
Nature Publishing Group
Related Researcher
Files:
There are no files associated with this item.
Collection:
Intelligent Devices and Systems Research Group1. Journal Articles


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