RT Journal Article
T1 Fast A‐site cation cross‐exchange at room temperature: single‐to double‐ and triple‐cation halide perovskite nanocrystals
A1 Otero Martinez, Clara
A1 Imran, Muhammad
A1 Schrenker, Nadine J.
A1 Ye, Junzhi
A1 Ji, Kangyu
A1 Rao, Akshay
A1 Stranks, Samuel D.
A1 Hoye, Robert L. Z.
A1 Bals, Sara
A1 Manna, Liberato
A1 Pérez Juste, Jorge
A1 Polavarapu , Lakshminarayana
K1 2307 Química Física
AB We report here fast A-site cation cross-exchange between APbX3 perovskite nanocrystals (NCs) made of different A-cations (Cs (cesium), FA (formamidinium), and MA (methylammonium)) at room temperature. Surprisingly, the A-cation cross-exchange proceeds as fast as the halide (X=Cl, Br, or I) exchange with the help of free A-oleate complexes present in the freshly prepared colloidal perovskite NC solutions. This enabled the preparation of double (MACs, MAFA, CsFA)- and triple (MACsFA)-cation perovskite NCs with an optical band gap that is finely tunable by their A-site composition. The optical spectroscopy together with structural analysis using XRD and atomically resolved high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and integrated differential phase contrast (iDPC) STEM indicates the homogeneous distribution of different cations in the mixed perovskite NC lattice. Unlike halide ions, the A-cations do not phase-segregate under light illumination.
PB Angewandte Chemie International Edition
SN 14337851
YR 2022
FD 2022-08-22
LK http://hdl.handle.net/11093/4332
UL http://hdl.handle.net/11093/4332
LA eng
NO Angewandte Chemie International Edition, 61(34): e202205617 (2022)
NO Financiado para publicación en acceso aberto: Universidade de Vigo/CISUG
NO Agencia Estatal de Investigación | Ref. PID2020-117371RA-I00
DS Investigo
RD 28-sep-2023