The effect of Mn doping on the interband transition and band tail absorption characteristics of Mn:(Pb, Sr)TiO3 ferroelectric thin films
Received:February 13, 2019  Revised:July 09, 2019  download
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Author NameAffiliationE-mail
LI Yan-Qing Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic,East China Normal University, Shanghai 200241,China 1054134505@qq.com 
WU Man Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic,East China Normal University, Shanghai 200241,China  
YANG Jing Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic,East China Normal University, Shanghai 200241,China jyang@ee.ecnu.edu.cn 
Abstract:Mn composition dependence of optical properties, especially interband electronic transition and band tail absorption behaviors, in Mn doped (Pb, Sr)TiO3 (PST) films were investigated by transmittance spectroscopy. The optical parameters of Mn doped PST films in transparent region were evaluated by Cauchy model. The decrease of optical band gap and the expansion of the band tail states with the increasing of Mn dopant amount were observed. The shrinkage of optical band gap is attributed to lowering the bottom of conduction bands by Mn 3d orbitals and the decrease of lattice constant in Mn doped PST films. Meanwhile, the random occupation of Mn ion and the increase of oxygen vacancy after Mn doping are the main causes for the expansion of localized states in band tails.
keywords:Ferroelectric films  Electronic band structure  Optical properties  band tails
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