^aDepartment of Physics, Rajeev Gandhi Government PG College, Mandsaur

458001 India

^bDepartment of Computer Engineering and Applications, G. L. A. University

Mathura 281406 India

^cSchool of Applied Sciences, Shri Venkateshwara University, Amroha 244221

India

^dDepartment of Electronics and Communication Engineering, KIET Group of

Institutions, Ghaziabad 201206, India

^eDepartment of Physics, Chintamani College of Arts and Science, Gondpipri,

Maharashtra 442702 India

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

Uttaranchal University, Dehradun, Uttarakhand 284007 India

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

Chandigarh University, Mohali, Punjab 140413 India

Novel energy materials grab the attention of researchers because of the huge demand for green energy sources. We have attempted to investigate the physical properties of such material which will be suitable for photovoltaic applications. Double perovskites of A2BB’X6 framework have been conspicuous materials by the virtue of their magnificent electronic and optical properties. We have computed the physical properties of Cs2RbInI6 double perovskite compound using the first principles method along with density functional theory (DFT). Complete computational analysis has been done within wien2k simulation code which is based on full potential linearized augmented plane wave method.