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报道了由生长在倾斜SrTiO3(001)基片上的La0.67Ca0.33MnO3薄膜制备的光探测器.在室温下,当脉宽20ns的308nm紫外激光照射La0.67Ca0.33MnO3薄膜时,在样品两端会诱导出光生伏特信号.为了减小测量回路对探测信号的影响,系统研究了阻抗效应.如果示波器的内阻与同轴信号传输电缆的阻抗匹配,光伏信号脉冲近似为三角对称形状,响应时间为光源的脉宽.探测器的灵敏度与辐照能量有关,在低能量时与辐照面积呈线性关系.由于这种探测器既不需要外置偏压,也不需要信号放大单元,工艺简单,因此利于实际应用与开发.
The photodetector prepared from La0.67Ca0.33MnO3 thin film grown on a tilted SrTiO3 (001) substrate was reported.When the La0.67Ca0.33MnO3 thin film with a pulse width of 20 ns was irradiated at room temperature, Will induce a photovoltaic signal.In order to reduce the influence of the measurement loop on the detection signal, the system studies the impedance effect.If the oscilloscope’s internal resistance and the coaxial signal transmission cable impedance match, the photovoltaic signal pulse is approximately triangular symmetrical shape, the response time As the pulse width of the light source.The sensitivity of the detector is related to the energy of the irradiation and it is linear with the irradiation area at low energy.Because this detector neither needs external bias voltage nor the signal amplification unit, , So conducive to the practical application and development.