Room-Temperature Persistent Photoconductivity in Barium Calcium Titanate
Tóm tắt
Barium calcium titanate (Ba1-xCaxTiO3, 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 BaTiO3 and SrTiO3 (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.
Tài liệu tham khảo
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