Structural characterization of vacuum evaporated ZnSe thin films

Abstract

Thermally evaporated ZnSe thin films deposited on glass substrates within substrate temperatures (T s ) at 303 K-623 K are of polycrystalline nature having f.c.c. zincblende structure. The most preferential orientation is along [111] direction for all deposited films together with other abundant planes [220] and [311]. The lattice parameter, grain size, average internal stress, microstrain, dislocation density and degree of preferred orientation in the film are calculated and correlated with T s .

Quantum phenomena of ZnSe nanocrystals prepared by electron beam evaporation technique

“…At the same time, stress relaxation is taking place at relatively lower substrate temperatures. A decreasing trend is observed for the microstrain and dislocation density values with increasing substrate temperature from RT to 300 o C, which is the same as observed earlier by Venkatachalam et al, [22] and Kalita et al, [23]. The variations are shown in Fig.…”

Influence of substrate temperature on the properties of electron beam evaporated ZnSe films

“…The reduction in the strain and dislocation density with substrate temperature may be due to the movement of interstitial Zn atoms from the bulk of the grain to its boundary region which dissipate to larger area leading to reduction in concentration of lattice imperfections. Similar trend has been observed earlier [11,18].…”

“…A close analysis of the dependence of the above microstructural parameters on the substrate temperature indicates that the degree of preferred orientation along with the other microstructural features are more prominent than the crystallite size for films with low thickness. This type of correlation is observed and reported by earlier workers [18,23] for other II-VI thin films like CdSe as well.…”

“…The device performance has been demonstrated to be influenced by the structural properties of the deposited film [17]. The structural parameters such as the crystallinity, lattice constant, grain size, strain, dislocation density and crystal orientation depend strongly on the growth conditions such as growth temperature and Se/Zn ratio [18]. Recently, the influence of substrate temperature on compositional, structural, optical and electrical properties of polycrystalline ZnSe films has been reported [11], and the influence of Se/Zn ratio on the grain size and photo-conducting properties has also been investigated [19].…”

Additive Processing of Polymers

“…Porous parts of polymer-ceramic composites, consisting of PP and tricalcium phosphate (TCP), have also been produced by this method. [53] Further studies have investigated polymer/ceramic, [54][55][56] ceramic/metal [57] and polymer/metal compounds. [58,59] Polymer-metal compounds appear to be especially wellsuited for rapid-tooling purposes.…”