| 초록 |
In this presentation, we report an efficient method to adjust the compositions of CH3NH3PbI3 perovskite by controlling the working pressure of CH3NH3I and its effects on perovskite films in a vacuum co-deposition process. Thermal heating of the CH3NH3I source in a vacuum chamber increases the working pressure, which can be an indicator for the control of the ratio of CH3NH3I for perovskite in the vacuum thermal co-deposition process. Under the different working pressures, the physical properties of the films with various compositions differed significantly. At the optimum working pressure, the perovskite solar cell fabricated using an all-vacuum process showed a maximum power conversion efficiency of 14.5% with high reproducibility, implying successful formation of the film using the pressure-controlled vacuum co-deposition. |
