The photovoltaic devices using lead halide perovskites as light absorber have pulled the attention of researchers due to their outstanding performance. However, the lead halide perovskite based photovoltaic devices suffering from the toxicity of lead (Pb) and lower stability in air. Recently, enormous efforts have been made to develop the efficient, lead (Pb) free and stable perovskite solar cells (PSCs). In this regards, various strategies were applied and the optoelectronic properties of various Pb free perovskites such as (CH₃NH₃)₃Bi₂I₉, Cs₃Sb₂I₉, Cs₃Bi₂I₉, CH₃NH₃SnI₃ and CH₃NH₃GeI₃ etc has been investigated. However, the photovoltaic performance of the developed PSCs was still low and shows poor stability against moisture and heat. Herein, we have investigated the optoelectronic properties of Pb free perovskite by utilizing (NH₄)₃Sb₂I₉ as light absorber material. Moreover, we have employed modified two step procedure for the preparation of (NH₄)₃Sb₂I₉. The developed Pb free PSCs device (FTO/CL-TiO2/m-TiO2/(NH₄)₃Sb₂I₉/HTM/Au) exhibited enhanced power conversion efficiency (PCE) of 0.42% with open circuit voltage (Voc) of 945 mV.