Persistent photoconductivity in barium titanate
نویسندگان
چکیده
Annealed bulk crystals of barium titanate (BaTiO3) exhibit persistent photoconductivity (PPC) at room temperature. Samples were annealed in a flowing gas humid argon and hydrogen, with higher flow rate corresponding to larger PPC. When exposed sub-bandgap light, broad infrared (IR) absorption peak appears 5000 cm−1 (2 μm), attributed polaronic or free-carrier from electrons the conduction band. Along increased IR absorption, electrical resistance is reduced by factor approximately two. The threshold photon energy for PPC 2.9 eV, similar case SrTiO3. This similarity suggests that mechanisms are similar: an electron substitutional hydrogen (HO) photoexcited into band, causing proton leave oxygen vacancy attach host atom. barrier recover ground state large such persists
منابع مشابه
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ژورنال
عنوان ژورنال: Journal of Applied Physics
سال: 2022
ISSN: ['1089-7550', '0021-8979', '1520-8850']
DOI: https://doi.org/10.1063/5.0075484