This　article　reports　a　computational　comparison　modelling　of　two　types　of　thin　film　perovskite　solar　cells　which　includes　a　standard　lead　based　perovskite　solar　cell　and　tin　based　solar　cell.　The　lead　based　perovskite　solar　cell　shows　better　performance,　however,　they　are　not　sustainable　for　a　longer　period　of　time　due　toxic　materials,　which　are　not　environmental　friendly　and　corrosive　materials　that　react　with　perovskite　layer　and　slowly　corrode　it,　reducing　the　efficiency　and　badly　affecting　the　physical　state　of　the　cell.　Therefore,　we　proposed　a　tin　based　perovskite　solar　cell,　which　contains　non-toxic　and　non-corrosive　materials.　Results　indicate　that　the　standard　lead　based　perovskite　solar　cell　show　only　2.63%　more　efficiency　as　compared　to　non-toxic　one.　In　addition,　the　stability　under　different　operating　temperatures　for　both　kinds　of　cells　have　been　tested　and　it　is　observed　that　the　lead　based　structure　is　3.36%　more　stable　than　tin　based　structure.　These　analysis　show　that　the　tin　based　cell　performance　is　not　much　lower　than　the　lead　based　cell.　Therefore,　by　considering　the　environmental　and　stability　issues,　the　preferable　choice　is　the　tin　based　perovskite　solar　cell.