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Poole, Violet M.
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article
Room-Temperature Persistent Photoconductivity in Barium Calcium Titanate
Abstract
Barium calcium titanate (Ba 1- x Ca x TiO 3 , BCTO) annealed under a flowing humid 2% hydrogen–argon gas mixture exhibits room-temperature persistent photoconductivity (PPC). The annealing atmosphere was chosen to produce substitutional hydrogen impurities that can be photoexcited, leading to the PPC phenomenon. The threshold photon energy for PPC in a BCTO crystal with x = 0.15 is 2.7 eV, lower than that for BaTiO 3 and SrTiO 3 (2.9 eV). A significant increase in mid-infrared absorption, attributed to free carriers, was correlated with a drop in electrical resistance. This effect showed persistence for several days at room temperature. Annealing the sample in air erased the PPC, indicating that the process is reversible.