Abstract:An analysis of a fluctuation in the neighborhood of singular points of the Poisson and transport equations for a semi-insulator with negative differential conductivity due to field enhanced recombination yields a criterion for the transitions between stationary and non-stationary high-field domains. Critical voltages (domain lengths) and current oscillation frequencies are given for different saturation currents and agree well with experimental results reported for field-quenched CdS. It has been shown that, w… Show more
In CdS, unstable moving domains are observed, which exist in a current-voltage range between the range for stationary electrode-adjacent domains and the range for transitions to undeformed moving domains. These current -voltage ranges have been investigated in the same crystal by changing the electron concentration a t the boundary of a pseudocathode. Several CdS crystals, differently doped with Ag, Al, and &, have been investigated. An electro-optical method using the Franz-Keldysh effect was employed for domain observation. The influence of the distance between the electrodes on domain formation is discussed.I n CdS werden nichtstabile, wandernde Domiinen beobachtet, die in einem StromSpannungs-Bereich existieren, der zwischen dem Bereich der stationiiren, an der Elektrode anliegenden Domiinen und dem Ubergangsbereich zu undeformierten, wandernden Domiinen liegt. Diese Strom-Spannungs-Bereiche wurden in demselben Kristall durch hnderung der Elektronenkonzentration an der Grenzschicht einer Pseudokathode untersucht. Verschiedene CdS-Kristalle, .die unterschiedlich mit Ag, Al und Cu dotiert waren, wurden untersucht. Eine elektro-optische Methode, die den Franz-Keldysh-Effekt ausnutzt, wurde fur die Beobachtung der Domiinen verwendet. Der EinfluD des Elektrodenabstandes auf die Domiinenausbildung wird diskutiert.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.