E' centers in amorphous SiO(2) revisited: a new look at an old problem.

E0 Centers in Amorphous SiO2 Revisited: A New Look at an Old Problem

SOLVING FUZZY LINEAR PROGRAMMING PROBLEMS WITH LINEAR MEMBERSHIP FUNCTIONS-REVISITED

Recently, Gasimov and Yenilmez proposed an approach for solving two kinds of fuzzy linear programming (FLP) problems. Through the approach, each FLP problem is first defuzzified into an equivalent crisp problem which is non-linear and even non-convex. Then, the crisp problem is solved by the use of the modified subgradient method. In this paper we will have another look at the earlier defuzzifi...

Hydrogen-induced rupture of strained Si─O bonds in amorphous silicon dioxide.

Using ab initio modeling we demonstrate that H atoms can break strained Si─O bonds in continuous amorphous silicon dioxide (a-SiO(2)) networks, resulting in a new defect consisting of a threefold-coordinated Si atom with an unpaired electron facing a hydroxyl group, adding to the density of dangling bond defects, such as E' centers. The energy barriers to form this defect from interstitial H at...

Experimental evidence for two fundamentally different E' precursors in amorphous silicon dioxide

E' centers (trivalent silicons) in two silicate systems, thermally grown SiO 2 films on silicon and high surface area bulk sol-gel silicates, have been investigated. In the thermally grown silicon dioxide films, earlier work is extended by demonstrating that the hole trapping process is reversible; no complex structural rearrangement occurs at the hole trapping site (E' centers) after subsequen...

Synthesis, growth mechanism, and light-emission properties of twisted SiO2 nanobelts and nanosprings.

Amorphous twisted SiO(2) nanobelts have been synthesized on Si wafers using facile thermal evaporation. These nanobelts are produced together with SiO(2) nanowires and a small quantity of SiO(2) nanosprings. Spectral and microstructural analyses suggest that the twisted SiO(2) nanobelts and nanosprings form via a polar surface driven process. Spontaneous polarization on the very thin polar crys...