Details

Autor(en) / Beteiligte

• Hodgkins, Taylor L
• Savory, Christopher N
• Bass, Kelsey K
• Seckman, Bethany L
• Scanlon, David O
• Djurovich, Peter I
• Thompson, Mark E
• Melot, Brent C

Titel

Anionic order and band gap engineering in vacancy ordered triple perovskites

Ist Teil von

• Chemical communications (Cambridge, England), 2019, Vol.55 (21), p.3164-3167

Ort / Verlag

England: Royal Society of Chemistry

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We demonstrate that the optical absorption of the vacancy-ordered triple perovskite, Cs3Bi2Br9, can be significantly red-shifted by substituting Br with I while maintaining the layered structural topology. We also present evidence that Br ions prefer to occupy the bridging halide position within the layers in order to minimize strain within the lattice that results from the incorporation of the significantly larger iodide anions into the lattice. These results not only quantify the upper limit for I content in the layered polymorph, but also establish the minimum band gap obtainable from these Bi-based phases.