The highest power conversion efficiency (PCE) for organic-inorganic perovskite solar cells based on lead is reported as 25.2% in 2019. Lead-based hybrid perovskite materials are used in several photovoltaics applications, but these are not highly favored due to the toxicity of lead and volatility of organic cations. On the other hand, hybrid lead-free double perovskite has no such harm. In this research study, SCAPS numerical simulation is utilized to evaluate and compare the results of perovskite solar cell based on double perovskite
FA
2
BiCuI
6
and standard perovskite
CH
3
NH
3
PbI
3
as an active layer. The results show that the power conversion efficiency obtained in the case of
FA
2
BiCuI
6
is 24.98%, while in the case of
CH
3
NH
3
PbI
3
, it is reported as 26.42%. This indicates that the hybrid organic-inorganic double perovskite
FA
2
BiCuI
6
has the ability to replace hybrid organic-inorganic perovskite
CH
3
NH
3
PbI
3
to expand next-generation lead-free harmless materials for solar cell applications.