Current Saturation Associated with Ultrasonic Amplification in CdS Crystals

概要

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Non-ohmic behavior in CdS associated with ultrasonic amplification was investigated. The threshold fields for the departures from Ohm's law depend upon the crystal length and decrease with increasing conductivity. The buildup time of acoustoelectric current decreases with increasing conductivity or applied fields. The buildup time for high conductivity samples is independent of crystal length and that for low conductivity depends upon crystal length. The field distribution is approximately uniform in ohmic region, but fields near positive electrode become higher as applied fields increase above threshold. Additional attenuation of transmitted microwave power (9.6 Gc) was observed when the main d,c. pulse along CdS was in saturation region. Electron drift mobility μ in the temperature range 300°K-120°K is estimated from threshold fields E_<th> by using the relation μE_<th>=v_s (v_s: sound velocity). At low temperature anomalous current-voltage characteristics were observed ; steady-state current decreases at fields just above threshold and then increases again with increasing fields.
社団法人日本物理学会の論文
1965-10-05