Yuanqing Chen1 2 Aditya Yerramilli1 Yuxia Shen1 Zhao Zhao1 Yang Song2 1 N. David Theodore1 3 Terry Alford1 4

1, Arizona State University, Tempe, Arizona, United States
2, Xi'an University of Technology, Xi'an, Arizona, United States
3, NXP Semiconductors, Chandler, Arizona, United States
4, African University of Science and Technology, Abuja, Arizona, United States

In this study, we explored the formation of Pb-Sn binary perovskite solar cells using Pb(CH3COO)3 and SnI2 as starting materials. We successfully fabricated CH3NH2Pb0.75Sn0.25I3 perovskite solar cells with a power-conversion efficiency (PCE) of nearly 10%, using a fast crystallization process. The effects of annealing time and temperature on the film properties were investigated. We found that a short-duration annealing at 100-105oC facilitated the crystallization of the CH3NH2Pb0.75Sn0.25I3 phase. We also found that the molar ratio of MAI: (Pb+Sn) influenced the film properties. The incorporation of excessive Pb and Sn ions improved the power conversion efficiency of the perovskite solar cells.