Atomic substitution in sidechains of an organic semiconductor show these solubilizing groups are not simple spectators. Silicon is the most electron withdrawing group 14 element, increasing photostability and offering desirable crystal packing.

[1] Infrared spectroscopy on synthetic olivines has established that there are at least four different mechanisms by which hydrogen is incorporated into the crystal structure. Two mechanisms occur in the system MgO-SiO2-H2O associated with silicon and magnesium vacancies, respectively. A third mechanism is associated with trivalent cation substitution, commonly Fe in natural olivine, while the ...

The chemical structure of sodium aluminosilicate glasses is determined by high resolution x-ray photoelectron spectroscopy ~XPS! as silicon is gradually replaced by aluminum. A well-defined chemical state is found for silicon, aluminum, and sodium atoms, while three different environments are identified for oxygen atoms corresponding to Si–O–Si, Si–O–Al, and Si–O–Na bonds. The binding energy of...

Low pressure chemical vapor deposition ~LPCVD! of silicon nitride from bis~tertiary-butylamino!silane ~BTBAS! and ammonia precursors has been demonstrated at 550-600°C in a 200 mm vertical batch furnace system. Deposition rates of 4-30 Å/min are achieved with a film thickness variation below 2% 1-sigma. Silicon nitride depositions using BTBAS and NH3 were found to retain a significant mass-tran...