  This research explores how temperature influences the optical characteristics
of Cubic Methylammonium Tin Iodide (CH$_3$NH$_3$SnI$_3$), a material showing
great promise for solar cell technology. The variations in the optical
absorption coefficient, refractive index, extinction coefficient, reflectivity,
and optical conductivity was examined over a range of temperatures and
crystallographic orientations ([100], [010], [001]). The findings indicate that
as temperature rises, there is a general decrease observed in the absorption
coefficient, refractive index, extinction coefficient, and optical
conductivity. Similarly, reflectivity also tends to decrease with increasing
temperature. These findings suggest that Cubic CH$_3$NH$_3$SnI$_3$ exhibits
consistent transparency, a stable refractive index, and relatively high
reflectivity across different temperature conditions. Its low optical
conductivity, typical of semiconductor materials, indicates its suitability for
facilitating efficient charge separation and transport within solar cells. This
research significantly adds to our comprehension of optical properties of
CH$_3$NH$_3$SnI$_3$, paving the way for its potential use in solar cell
applications.
