Percolation transition of persistent photoconductivity in II-VI mixed crystals

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Abstract

We have observed for the first time conductivity fluctuations in the persistent photoconductivity mode in II-VI mixed crystals with the magnitude following the percolation approach as -T-TC-, where TC is the percolation threshold temperature. Experimental results have demonstrated that the random local-potential fluctuations induced by compositional fluctuations are responsible for the persistent photoconductivity observed in II-VI mixed crystals. Different behaviors resulting from the DX centers, the macroscopic barrier, and the random local-potential fluctuations are distinguished.

Original languageEnglish
Pages (from-to)2547-2550
Number of pages4
JournalPhysical Review Letters
Volume64
Issue number21
DOIs
StatePublished - 1990

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