SEM imaging of acoustically stimulated charge transport in solids
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Date
2017-06-29
Authors
Emelin, E.
Cho, H. D.
Lee, J.
Kang, Tae Won
Panin, Gennady
Roshchupkin, Dmitry
Tynyshtykbayev, Kurbangali B.
Insepov, Z.
Journal Title
Journal ISSN
Volume Title
Publisher
Applied Physics Letters
Abstract
Applications of surface acoustic waves (SAWs) are of
great interest for solar energy for the acoustically stimulated
transport of charge carriers generated in semiconductors and
dielectrics under the influence of light.1–4 A prospective application of SAWs in solar cells could provide a 90% increase
in the cell efficiency. SAWs propagating in piezoelectric
crystals (piezoelectric semiconductor GaN and GaAs crystals
included) have opposite potential values in the SAW minima
and maxima due to the piezoelectric effect. Electrons and
holes generated by light in a semiconductor or in the subsurface layer of a piezoelectric crystal are correspondingly distributed between SAW minima and maxima. The charges are
then transported by SAWs to the solar cell exit at the acoustic
wave velocity. Taking advantage of the SAW presence in
solar cells, the area of charge “harvest” from the surface of a
semiconductor structure or a piezoelectric crystal can be
increased, and correspondingly, the solar cell efficiency can
be increased too.
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Citation
Emelin, E., Cho, H. D., Insepov, Z., Lee, J. C., Kang, T. W., Panin, G., Tynyshtykbayev, K. (2017). SEM imaging of acoustically stimulated charge transport in solids. Applied Physics Letters, 110(26), [264103]. https://doi.org/10.1063/1.4986779