^aDepartment of Physics, Dhanauri P.G. College, Dhanauri, Haridwar,

Uttarakhand, 247667, India

^bDepartment of Physical Sciences, Banasthali Vidyapith, Rajasthan, 304022, India cDepartment of Physics, Constituent Government Degree College, Richha Baheri, Bareilly, 243201, India

^dDepartment of Electronics and Communication Engineering, KIET Group of

Institutions, Ghaziabad, 201206, India

^eDepartment of Physics, S. V. College, Raja Mahendra Pratap Singh State

University, Aligarh, 202140, India

^fDivision of Research and Innovation, School of Applied and Life Sciences,

Uttaranchal University, Dehradun, 248007, India

g University Centre for Research & Development, Department of Physics,

Chandigarh University, Mohali, Punjab, 140413, India

Under the scope of all-solid-state perovskite solar cells, the important role of methyl- ammonium lead halide film lies in facilitating the formation of a photo-generated electron- rich film, which directly affects the overall photovoltaic performance. This study introduces a novel chemical strategy aimed at increasing the quality of perovskite film through minimal arsenic doping. The result of the inclusion of arsenic is characterized by high crystalline grains in the attainment of a homogeneous, uniform and ancient perovskite film. The analysis of the UV-Visible spectra indicates that the perovskite film, which is produced under sequential conditions, displays light extraction of electrons for light absorption, more effective electron transport, and adjacent electron transport layer. Different morphology obtained through customized perovskite conditions contribute to a better short-circuits current, which improves overall cell performance. Arsenic-doped perovskite-based solar cells demonstrate a 1.55% increase in power conversion efficiency compared to their non- decorated counterparts, exhibiting 0.20% efficiency. The outcomes not only offer a straightforward method for enhancing perovskite films but also introduce an innovative perspective on constructing high-performance perovskite solar cells using minimal amounts of arsenic, thereby minimizing toxicity in the fabricated solar cells.