Study on CH3NH3PbI3 Based Perovskite Solar Cell: An Approach to Antisolvent Treatment under Ambient Condition

Abstract

Solar cells based on new class of organic inorganic hybrid perovskite CH₃NH₃PbI₃ have sprung to prominence in recent years, due to their remarkable improvements of photovoltaic power conversion efficiencies (PCEs) over the last few years. Recently, it was observed that antisolvent engineering was an effective approach to improve the PCE and stability of perovskite solar cells. In this direction CH₃NH₃PbI₃ based thin film solar cells were prepared by Ethyl acetate (EA); antisolvent treatment for the first time. Our observations suggest that due to non-covalent weak interaction between the perovskite absorber and the high boiling point antisolvent, EA, a new micro structured morphology evolves in the CH₃NH₃PbI₃ thin film, which we report for the first time. FESEM image shows microrod type structures of CH₃NH₃PbI₃ after EA antisolvent treatment. Energy band diagram was constructed using photoluminescence and photoemission studies. A better power conversion efficiency was achieved in EA treated film compare to without EA treated film.