Organic, inorganic ABX₃ perovskite materials plays a crucial role in recent energy conversion research since it started in 2009 (~3.1%) by Miyasaka and his group.  The highest Power Conversion Efficiency (PCE) and cost effective processing techniques turned it as unavoidable replacement for Silicon solar cells.  Methylammonium Lead Iodide (CH₃NH₃PbI₃) absorbing material is the mostly optimized composition which gives better PCE  upto ~25.6%.  Though, structural instability and toxic nature of lead to human body were made to find the alternate for Lead (Pb).   Bismuth is a nontoxic and stable metal which has similar optoelectronic properties as lead and same electronic configuration.  The only challenge in Bi³⁺ perovskite is its rough morphology which has more pin-holes and poor surface coverage.  Here, Bismuth halide perovskite thinfilm was prepared by various solvents such as N,N^’ Dimethyl formamide, Dimethyl Sulphoxide, Ethanol, Acetone and Diethylether  by spin coating method.  The X-ray diffractometer analysis confirms that the mixed halide was formed.  From the UV-Visible absorption spectrum, this bismuth perovskites have more absorption in UV region and the bandgap (E_g) is 1.9 eV.  The surface morphology of the prepared thin films were analysed by Field Emission Scanning Electron microscope.  The Atomic Force Microscope is used to analyse the surface roughness of the bismuth perovskite thin films.  CH₃NH₃PbI₃ based perovskite solar cells were fabricated by using spray pyrolysis method, spin coating technique.