Cu(II)-Doped Cs2SbAgCl6 Double Perovskite: A Lead-Free, Low-Bandgap Material

By Abhoy Karmakar, Mya S. Dodd, Satyam Agnihotri, E. Ravera, Vladimir K. Michaelis. Chemistry of Materials, 2018

187 citations recorded by the source corpus.

Lead-free halide double perovskites with a generic formula of A2B′(III)B″(I)X6 (A and B are cations and X is a halide anion) are being explored as a less toxic, higher thermal- and moisture-stable alternative to well-studied lead halide perovskite (APbX3) solar energy absorbers. However, the absorption profiles of most double perovskites reported to date have larger bandgaps (>2 eV) that are poorly aligned with the solar spectrum, reducing their photoconversion efficiency. Here, we present new heterovalent paramagnetic Cu2+-doped Cs2SbAgCl6 double perovskites that exhibit dramatic shifts in their bandgaps from ∼2.6 eV (Cs2SbAgCl6, parent) to ∼1 eV (Cu2+-doped Cs2SbAgCl6). Powder X-ray diffraction patterns of the Cu2+-doped polycrystalline materials indicate long-range crystallinity with nonuniform microstrain in the crystal lattice. To decode the dopant, complementary magnetic resonance spectroscopy techniques, solid-state nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR), are use...

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/533cf94db1cef8db83269aee81acee916c2b41c2