  The manuscript reports the variation in optical band-gap of vacuum annealed
SnS thin films. The samples were characterized by using X-Ray Diffraction,
UV-visible Spectroscopy and Raman Analysis. Results show that while annealing
does not effect the nano-crystalline sample's lattice structure or unit cell
size it does control the grain size. The band-gap (Eg) decreases with increase
in grain size. Eg values were found to be very high (1.8-2.5 eV) for samples
studied.
