[10a-A24-1~11] 12.8 Specific theme: Photoelectric Properties, Structural Controls and Device of Perovskites Materials

11:30 AM - 11:45 AM JST(2:30 AM - 2:45 AM UTC)

[10a-A24-10] Structural and optical properties of halide double perovskite semiconductor
Cs₂MFeCl₆(M = Na, Fe) under high pressure

〇Kaede Sasaki¹, Satoshi Nakano², Kiyoto Matuishi¹ (1.Univ. of Tsukuba, 2.NIMS)

Keywords:

perovskite semiconductor,high pressure

The structural and optical properties of the double perovskite semiconductors Cs₂NaFeCl₆ and Cs₂AgFeCl₆ were investigated under high pressure. Powder X-ray diffraction, optical absorption, and Raman scattering measurements were performed using a diamond anvil cell (DAC). No structural phase transition was observed in Cs₂NaFeCl₆ up to 20 GPa, and it was experimentally demonstrated that 78% of the temperature-induced bandgap change originates from thermal excitation. Furthermore, the pressure-induced changes in the crystal structure and lattice vibrations of Cs₂AgFeCl₆ were also examined.