Improving the power conversion efficiency of the silicon based solar cell is possible by introducing new materials in the existing device structure to form silicon based heterojunction soar cells. The present research work investigates the modelling of heterojunction solar cell made of FeZnO dilute magnetic semiconductor (DMS) sandwiched between the P and N type silicon. Realized results show that the heterojunction device has more than two folds improved efficiency when compared to the solar cell made of single crystalline silicon. © 2021 Elsevier B.V., All rights reserved.