The Scaps-1d simulator was used to simulate a lead-free perovskite CH 3 NH 3 SnI 3 based solar cell devices fabricated from different hole transport materials (HTM). This research looks at two organic and two inorganic HTM layers. The cell structure used in this study is FTO/TiO 2 / CH 3 NH 3 SnI 3 /HTM(variable)/Au(variable). Spiro-OMeTAD, PEDOT:PSS, CuO and Cu 2 O are the HTM materials used. The results show that utilizing CuO as an HTM produces better outcomes than other HTMs, with an e ciency of 28.45%. The thickness, acceptor concentration (N A ), and defect density (N t ) of the perovskite layer on optoelectronic properties of the solar cell are focus of simulation studies. According to this study, an perovskite layer thickness of 1000 nm is suitable for a decent photovoltaic cell. Furthermore, by adjusting the HTM thickness and the defect density of HTM and absorber layer, promising ndings of J sc of 34.38 mAcm − 2 , V oc of 1.011 V, FF of 80.85% and PCE of 28.10% were obtained for Spiro-OMeTAD based PSC. Finally, in order to improve the device's performance, an anode material with high work function is required. Our ndings reveal that using a thin absorber layer results in low photo generated charge carriers due to less absorption, but high carrier extraction. Although more carriers are created in the cell due to increased absorption, decreased collection e ciency is related to recombination, which decreases V oc for thick perovskite layers. Device e ciency is improved by increasing the doping density up to 10 18 cm − 3 in the perovskite layer due to built-in electric eld across the solar cell. Again a very thin or thick HTL is not ideal for high PCE. For low recombination and a high ll factor, an HTM (Spiro-OMeTAD) of 1-100 nm is necessary. The great power conversion e ciency of organic HTM based lead-free PSC brings up the new possibilities for obtaining renewable energy.