Synthesis and characterization of Cs2Pb1-xBixCl2I2 (0 ≤ x ≤ 0.15) derivative perovskite

Edouard Breniaux (1) , Edelmy J. Marin-Bernardez (1) , Emilie Gallet (1) , Pascal Dufour (1) , Christophe Tenailleau (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Mechanosynthesis was used to obtain pure crystalline powders of a 2D Ruddlesden-Popper type Cs2(Pb1.xBix) Cbl2 phase, with O ???? x :$ 0.15. These newly discovered compounds present interesting physical properties that may make them suitable for electronic devices, including LEDs and photovoltaics. Detailed structural analysis based on X-ray diffraction (XRD) data shows that lead substitution by bismuth reduces the unit cell parameters. A significant color change of the material has been observed with a clear red-shift related to the Bi doping content. The introduction of bismuth into the structure also induces strains as evidenced by XRD peak enlargemen'Πbut the material can be pure up to x = 15 mol.%. A first ageing study shows that these strains seem to be released with time and that Cs2PbClilz and 5 mol.% Bi-doped Cs2PbClilz materials remain pure after a month in air.

Mots clés: Halide perovskite; Mechanosynthesis; Bismuth; 2D ruddlesden-popper type; Photovoltaics

Domaines: Matériaux

Edouard Breniaux, Edelmy J. Marin-Bernardez, Emilie Gallet, Pascal Dufour, Christophe Tenailleau. Synthesis and characterization of Cs2Pb1-xBixCl2I2 (0 ≤ x ≤ 0.15) derivative perovskite. Materials Chemistry and Physics, 2020, 247, pp.122870. ⟨10.1016/j.matchemphys.2020.122870⟩. ⟨hal-03033007⟩