521701.fig.003a
(a)
521701.fig.003b
(b)
521701.fig.003c
(c)
521701.fig.003d
(d)
Figure 3: PL spectra for films deposited at (a) 473 K and (b) 873 K, (c) transmittance ( ) spectra, and (d) plots of ( )2  versus for a representative GaN film deposited at 873 K. Inset of (c) shows variation of band gap with substrate temperature ( ) and inset of (d) shows the plot of versus .