Electrical Properties Of Amophous Semi Conductor :

Mervat Gamal A. Elshaarawy. 

three chalcogenide glasses of Ge20 Se12 TeGS’Ge27 Sell Te62 and Gel~ Te75 InlO have been praperedby q~enching their melts from abo~t 1000 00 in ice water •Rectang~ar discs of 2 x 2 x 1 mmJ dimensions are s~bjectedto electrical cond~ctivity meas~rements • It is fomdthat the mentioned systems behave the normal semicond~ctorsbehavio~ with activation energies of abo~t 0.5 eVeThe effect of thermal annealing on the bothcond~ctivity and the activation energy is st~died to followup the effect of aging on the stability of these systems• It is fomd in general that tb,econd~ctivity increaseswith annealing time • Besides, the activation energiesdecrease with annealing time • This is s~ested tobe d~e to the n~cleation and growth process. This res-~lt are confirmed with X-ray analysis.In the other hand, I-V charact.eristics . showedmemory switching phenomena. The switching process isinterpreted according to the electrothermal model.