论文标题
空间电荷有限的光电流和CDZNTE辐射探测器中的瞬时电流
Space charge limited photocurrents and transient currents in CdZnTe radiation detectors
论文作者
论文摘要
我们结合了稳态光电导率和激光诱导的瞬时电流测量，以研究CDZNTE中的空间电荷形成。开发了描述空间电荷的分析和数值模型有限的光电，并与测量数据达成了极好的一致性，尤其是在漂移扩散模型中。观察到在低偏置处光电流的线性上升，并归因于靠近阴极侧的区域的注射孔的捕获。在数值上模拟了空间电荷形成，光电传入性增益，浅水水平对光电流电压特性的影响。根据测量和计算，对探测器特性评估（主要是迁移率的产物）的最新原理进行了严格评估。
We combined steady-state photoconductivity and laser-induced transient current measurements under above-band-gap illumination to study the space charge formation in CdZnTe. Analytical as well as numerical models describing space charge limited photocurrents were developed and an excellent agreement with measured data was obtained especially with the Drift-diffusion model. Linear rise of photocurrent at low bias was observed and ascribed to the trapping of injected holes at the region close to the cathode side. Influence of space charge formation, photoconductive gain, contribution of shallow and deep levels to photocurrent-voltage characteristics were numerically simulated. According to the measurements and calculations, recent principles used at the evaluation of detector properties, mainly the mobility-lifetime product, via the photoconductivity are critically assessed.
