[19p-C302-1~13] 12.5 Organic and hybrid solar cells

2:00 PM - 2:15 PM JST(5:00 AM - 5:15 AM UTC)

[19p-C302-4] Photoexcited Carrier Dynamics in Iodine-Doped CH₃NH₃PbBr₃ Single Crystals

〇Dong Liu¹, Hua Li¹, Yusheng Li¹, Dandan Wang¹, Yongge Yang¹, Yuyao Wei¹, Shikai Chen¹, Guozheng Shi¹, Taro Toyoda¹, Shuzi Hayase¹, Qing Shen¹ (1.Univ. of Electro-commun.)

Keywords:

perovskite,single crystal,carrier dynamics

Iodine-doped bromide perovskite single crystals (IBPSCs) have important applications in optoelectronic field such as solar cells. Currently, much research has aimed to study phase separation phenomenon and device performance improvements in IBPSCs. However, the important intrinsic photoexcited carrier dynamics are often overlooked in IBPSCs. Here, we explored the photoexcited carrier dynamics in typical iodine-doped MAPbBr₃ single crystals using the excitation intensity-dependent steady-state photoluminescence (PL) and time-resolved photoluminescence (TRPL) technique. In our experiment, the MAPb(Br_1-xI_x)₃ (x=0, 0.10, 0.20, 0.33) single crystals have been synthesized using inverse temperature crystallization method. We confirmed the doping of iodine through optical absorption, PL, X-Ray Diffraction (XRD), and X-ray rocking curves measurements. According to the excitation intensity dependent PL, we found that the trap state density changes with the amount of doped iodine increasing, which own a similar change trend with the PL decay at early stage. Further, we noticed that there is an influence of carrier diffusion on the photoexcited carrier dynamics, we evaluated the carrier diffusion coefficients and recombination constants via numerical simulations of the PL kinetics. Consequently, we found that the electron shallow trap-related carrier behaviors substantially impacted the PL kinetics. Our results greatly facilitate the deeper comprehension of the fundamental characteristics of mixed halide perovskite material.