Conductivity-Variation of Non-Ohmic Behaviors in Photoconducting CdS

概要

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Two types of current saturation were observed in photoconducting CdS. One mainly appears in the low conductivity range and the other in the high conductivity range. The former is characterized by τ>T_t(τ: onset time, T_t: sound transit time) and a bell-shaped curve of 1/τ vs γ (γ: reduced applied field), while the latter by τ< T_t and a straight line of 1/τ vs γ. In the intermediate conductivity range, they are superimposed on each other. These non-ohmic behaviors can be interpreted in terms of conductivity-dependence of the dominant mechanism of acoustic flux build-up. Namely, the current saturation in the low conductivity range is caused by the "round-trip" gain mechanism through classical sound amplification, while that in the high conductivity range is attributed to the one-way transit gain through stimulated phonon emission.
社団法人日本物理学会の論文
1969-05-05