Metal-insulator transition in semiconductor alloys probed by persistent photoconductivity.

Band-tail states in a Zn0.3Cd0.7Se semiconductor alloy probed by persistent photoconductivity.

The distribution of the conduction-band tail states in a Zn03Cd07Se II-VI semiconductor alloy has been determined experimentally using persistent photoconductivity (PPC) transient measurements, and is confirmed to be exponential. Our results show that the transport properties in II-VI semiconductor alloys are strongly influenced by tail states caused by alloy disorder. A class of transport prop...

X-ray induced persistent photoconductivity in Si-doped Al0.35Ga0.65As

We demonstrate that x-ray irradiation can be used to induce an insulator–metal transition in Si-doped Al0.35Ga0.65As, a semiconductor with DX centers. The excitation mechanism of the DX centers into their shallow donor state was revealed by studying the photoconductance along with fluorescence. The photoconductance as a function of incident x-ray energy exhibits an edge both at the Ga and As K ...

Persistent photoconductivity in IIVI and IIIV semiconductor alloys and a novel infrared detector

Charge storage and persistent photoconductivity in a CdS0.5Se0.5 semiconductor alloy.

Relaxation of stored charge carriers in the persistent-photoconductivity (PPC) mode in a CdSo 5Seo, semiconductor alloy has been investigated. The relaxation time constant of PPC is systematically measured as a function of temperature, from which the recombination barrier height E„, has been determined. Low-temperature exciton luminescence has also been investigated and the exciton transition l...

Persistent X-ray photoconductivity and percolation of metallic clusters in charge-ordered manganites

– Charge-ordered manganites of composition Pr1−x(Ca1−ySry)xMnO3 exhibit persistent photoconductivity upon exposure to X-rays. This is not always accompanied by a significant increase in the number of conduction electrons as predicted by conventional models of persistent photoconductivity. An analysis of the X-ray diffraction patterns and current-voltage characteristics shows that X-ray illumina...