T. Mather, C. Padilla, S. Aryal, C. Lewis, Q. Jiang, A. Sumant, Y. Lin, A.B. Kaul
University of North Texas,
United States
Keywords: Perovskites, 2D perovskites, 2D materials, solar cells, stability, photodetectors
Summary:
Perovskite material have demonstrated a tremendous aptitude for light absorption and response over the past decade, but their unstable nature when exposed to moisture ingress and increased temperature limits their commercial success. Understanding how the charge-carrier dynamics of certain types of perovskites, specifically triple-cation perovskites and lower-dimensionality two-dimensional (2D) perovskites change when subjected to these conditions is critical in determining how devices such as photodetectors and solar cells perform in the field. In this work, we studied photoabsorption in triple cation, mixed halide perovskites, specifically composed of Cs0.05FA0.79MA0.16PbI2.55Br0.45 as well as 2D perovskites. Our two-terminal devices were formed with spin-coating using the chemical solution processing approach to deposit the perovskite materials. Temperature-dependent optoelectronic transport measurements were done to investigate the role of temperature on device performance. As we increased temperature, generated photocurrent increased which is consistent with semi-conducting devices such as perovskites. Besides discussing results on the photodetector device figures of merit, we also comment on the use of these photoabsorbers with solar cells, where we present stability data upon the exposure of the devices to increasing levels of humidity.