en عمومى General پژوهشي Research Recently, organo&ndash;metal halide perovskites have attracted much attention of the scientific community relating to their successful application in the absorber layer of low-cost solar cells. However, enough is known about the material and device properties, to realize that much remains to be learned.<br> <a name="OLE_LINK557"></a><a name="OLE_LINK556">In this paper, the electrical and optical </a><a name="OLE_LINK329"></a><a name="OLE_LINK328">properties</a> of perovskite solar cells are investigated <a name="OLE_LINK551"></a><a name="OLE_LINK550">using the COMSOL Multiphysics </a><a name="OLE_LINK553"></a><a name="OLE_LINK552">simulation program</a>. It is a study of the influences <a name="OLE_LINK327"></a><a name="OLE_LINK326">of carrier diffusion length (L), </a><a name="OLE_LINK358"></a><a name="OLE_LINK357">dielectric constant (</a>&epsilon;_r), the valence band offset (VBO) of absorber/hole transport materials (HTM) and illumination intensity on fill factor (FF), short-circuit current density(J_SC), performance (PCE), and open-circuit voltage(V_OC). Also, J-V characteristics are calculated for diff<a name="OLE_LINK335"></a><a name="OLE_LINK334">eren</a>t &epsilon;_r values. The simulation results point to the great dependence of efficiency on the carrier diffusion length of absorber layers. It is shown that, to obtain a high rate of efficiency, the relative permittivity should not be higher than 45.<a name="OLE_LINK77"></a><br> &nbsp; Perovskite solar cells, Fill Factor, Power Conversion Efficiency, Simulation. 57 66 http://ijop.ir/browse.php?a_code=A-10-518-3&slc_lang=en&sid=1 Elham Karimi 10031947532846003122 10031947532846003122 No Department of Physics, Faculty of Physics, University of Kashan, Kashan, Iran Seyed Mohamad Bagher Ghorashi mghorashi@kashanu.ac.ir 10031947532846003123 10031947532846003123 Yes Department of Physics, Faculty of Physics, University of Kashan, Kashan, Iran Maryam Hashemi 10031947532846003124 10031947532846003124 No Department of Physics, Faculty of Physics, University of Kashan, Kashan, Iran