^aDepartment of Physics ,Sree Narayana College, Nattika, University of Calicut,

Kerala, India,PIN-680566

^bOpto electronic Device simulation Research Lab, Department of Physics, Christ College (Autonomous), Irinjalakuda, University of Calicut, Kerala, India, PIN-

680125

Perovskite solar cells without a hole transport layer have gained popularity due to their stability and affordable manufacturing cost. In this work, device simulation of the solar cell structure is done using SCAPS- 1D software with TiO2 as the Electron Transport Layer while toxic-free compound CH3NH3SnBr3 as the absorber material. The efficiency of the structure is found to be 12.63%. The cell performance parameters are investigated by varying individual cell parameters such as absorber layer thickness, absorber layer defect density and doping concentration, ETL thickness, ETL doping concentration, temperature and defect density of the absorber/ETL interface while holding others constant. Simulation with the optimised cell parameter values improves the efficiency to 24.02%.