Temperature Effects on Self-Organized Patterns and Characteristics of Bistable ZnS:Mn Thin-Film Structures

✍ Scribed by Vlasenko, N.A. ;Purwins, H.-G. ;Popov, V.M. ;Gumenyuk, I.A. ;Klimenko, A.S. ;Kononets, Ya.F. ;Niedernostheide, F.-J. ;Veligura, L.I. ;Zuccaro, S.

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 178 KB
• Volume: 194
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/1521-396x(200211)194:1<237::aid-pssa237>3.0.co;2-l

✦ Synopsis

A temperature (T) rise from 20 up to 80 C results in some decrease of the threshold voltage and slope of the voltage (V) dependences of the luminance and the transferred charge of the electronbeam evaporated ZnS:Mn ac thin film electroluminescent structures (ac TFELS) showing different patterns or no patterns in the emission. Such a heating leads to an improvement of the dynamics of all the patterns, to a narrowing and acceleration of the autowave (AW) front. However, the dynamic patterns are not formed by such a heat treatment if they are absent at any frequency of V and T = 20 C. Although AWs more often take place at 70-80 C, they have also been observed at T 40 C in some samples. It has been concluded that heating is not a sufficient condition for the formation of patterns. It enhances the generation of initial free electrons at a given V, promotes a lateral spreading of the non-equilibrium charge carriers, but decreases the rate of all processes responsible for the bistability of the TFELS and the self-organization in them.