Ethylammonium Bromide- and Potassium-Added CH3NH3PbI3 Perovskite Solar Cells

Perovskite solutions with added potassium iodide (KI) and ethylammonium bromide (EABr) were used to fabricate perovskite solar cells in ordinary air at 190 degrees C. The addition of EABr and KI induced (100)-oriented perovskite crystals, which resulted in the improvement in short-circuit current densities and conversion efficiencies. The short-circuit current density, open circuit voltage, and conversion efficiency of the best device were 21.0 mA cm(-2), 0.942 V, and 12.88%, respectively. First-principles calculations also indicated a decrease in total energy per cell and an increase in energy gaps, which agreed with the improved results of device stabilities and photovoltaic properties.

Automated summary

In this study, perovskite solar cells were successfully fabricated in ordinary air by using perovskite solutions with added potassium iodide and ethylammonium bromide, which improved the performance of the cells. First-principles calculations were in agreement with the experimental results, providing a theoretical basis for enhancing device stability and photovoltaic properties.