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Crystals 2018, 8(7), 294; https://doi.org/10.3390/cryst8070294

Small Polaron Hopping in Fe:LiNbO3 as a Function of Temperature and Composition

1
Dipartimento di Fisica e Astronomia, Università di Padova, via Marzolo 8, 35131 Padova, Italy
2
School of Physics, Osnabrueck University, Barbarastrasse 7, 49076 Osnabrueck, Germany
*
Author to whom correspondence should be addressed.
Received: 11 June 2018 / Revised: 12 July 2018 / Accepted: 13 July 2018 / Published: 18 July 2018
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Abstract

Small-polaron hopping involved in charge transport in Fe-doped congruent lithium niobate is investigated as a function of temperature and composition by means of light-induced transient absorption spectroscopy. The relaxation dynamics of the light-induced polaron population is characterized by individual activation energies within different temperature ranges. A numerical investigation carried out by Monte Carlo simulations reveals that these findings may be understood in terms of the varying abundance of the different types of hops that the polarons may perform among regular or defective lattice sites. The role of the temperature and of the sample composition on the distribution of the different hop types is thus explored for a wide range of parameters, allowing one to preview the charge transport properties for a given set of experimental conditions. View Full-Text
Keywords: lithium niobate; small polarons hopping; light-induced charge transport; transient absorption; Marcus-Holstein Theory lithium niobate; small polarons hopping; light-induced charge transport; transient absorption; Marcus-Holstein Theory
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Vittadello, L.; Bazzan, M.; Messerschmidt, S.; Imlau, M. Small Polaron Hopping in Fe:LiNbO3 as a Function of Temperature and Composition. Crystals 2018, 8, 294.

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