[We-A2-D] Physics of halide perovskites

12:15 PM - 12:30 PM JST(3:15 AM - 3:30 AM UTC)

[We-A2-D-06] From Glassy Disorder to Cooperative Order: How Organic Cations Control Phase Transitions in Hybrid Perovskites

〇Furqan Hassan¹, Syed Bilal Junaid², Jae Hyeon Ko², Seong Heon Kim¹ (1. Jeonbuk National Univ. (Korea), 2. Hallym Univ. (Korea))

We demonstrate that organic cations govern the crossover from glassy freezing to cooperative phase transitions in hybrid perovskites. Multi-technique studies reveal how cation size and hydrogen bonding tune lattice dynamics, elastic softening and thermodynamic stability in mixed-halide systems.