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(a) XRD patterns of films grown at various temperatures. Structural evolution and phase transitions as a function of are as noted. films grown at are amorphous . films exhibit a phase transition to monoclinic at and to tetragonal at higher temperatures.
Optical transmittance spectra of films. The curves indicate that films are highly transparent.
vs plots for films. Linear fits of the absorption data indicate the indirect band gap of films. The extrapolation of the linear region to to determine values is as indicated with lines. The arrow indicates the shift in as a result of size reduction leading to QC effects.
(a) relationship in films. A direct inverse relationship is evident; a line is provided not only to guide the eye but also to indicate the linear fit.
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