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本文以层状的CTRW 模型为基础,对非晶半导体超晶格中的瞬态光电导作了理论计算.在计算过程中一方面考虑到周期性内电场对载流子与其复合中心的空间分离作用,另一方面也考虑到载流子本身对这个内电场的多体屏蔽效应,以及载流子的不同复合机制和非晶态物质所固有的长时尾行为对瞬态光电导的影响.计算结果显示出这些物理因素对瞬变电流的不同影响.通过对结果的分析我们讨论了这种材料中持续光电导(PPC)效应的可能机制.
Based on the layered CTRW model, theoretical calculations are made for the transient photoconductivity in amorphous semiconductor superlattices. In the calculation process, on the one hand, the spatial separation between carriers and their recombination centers is considered in the periodic electric field On the other hand, the multi-body shielding effect of carriers on this internal electric field and the influence of different recombination mechanisms of carriers and long-tail behavior inherent in amorphous materials on transient photoconductivity are also considered. The calculated results show the different effects of these physical factors on the transient currents.Analysis of the results reveals the possible mechanism of the persistent photoconductive (PPC) effect in this material.