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Remarkable enhancement in the Kapitza resistance and electron potential barrier of chemically modified In2O3(ZnO)9 natural superlattice interfaces
Ist Teil von
Physical chemistry chemical physics : PCCP, 2015-11, Vol.17 (44), p.29655-2966
Ort / Verlag
England
Erscheinungsjahr
2015
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Superlattice interfaces can efficiently scatter phonons and filter low-energy electrons, thereby reducing the thermal conductivity to the "alloy limit" of crystalline solids and increasing the Seebeck coefficient substantially. In this paper, we report a two-fold reduction in the thermal conductivity and an improvement of about 170% in the Seebeck coefficient of an existing In
2
O
3
(ZnO)
9
superlattice by chemically modifying the interface with small additions of aluminum. Using a classical model for the interface transport, we attribute such significant changes to the increase in both the Kapitza (thermal) resistance and the electron potential barrier height of the InO
2
−
superlattice interfaces that are modified by Al
3+
. The present work opens a new avenue of research showing that the superlattice interfaces can be chemically tuned for specific properties, which can be investigated in both experimental and computational ways, and also suggests a new route for material design for applications in areas like thermoelectrics.
Modification of the In
2
O
3
(ZnO)
9
superlattices with aluminum alters the Kapitza resistance and electron potential barrier of the interfaces, leading to significant reduction in thermal conductivity and considerable enhancement of Seebeck coefficient.