期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 61, 期 34, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202205617
关键词
Cation Exchange; Mixed A-Cation Perovskites; Perovskite Nanocrystals; Phase Segregation; Triple-Cation Perovskites
资金
- Spanish Ministerio de Ciencia e Innovacion through Ramon y Cajal grant [RYC2018-026103-I]
- Spanish State Research Agency [PID2020-117371RA-I00]
- Xunta de Galicia [ED431F2021/05]
- Research Foundation-Flanders (FWO) [1238622N]
- European Research Council [ERC-CoG-2019815128]
- European Commission (EUSMI) [731019]
- Royal Academy of Engineering [RF\201718\1701]
- Royal Society
- European Research Council under the European Union [756962]
- Engineering and Physical Sciences Research Council (EPSRC) [EP/R023980/1]
- Italian Ministry of University and Research (MIUR) through the Flag-Era JTC2019 project Solution-Processed Perovskite/Graphene Nanocomposites for Self-Powered Gas Sensors (PeroGaS)
- Universidade de Vigo/CISUG
- Tata Group [UF150033]
- European Research Council (ERC) [756962] Funding Source: European Research Council (ERC)
This research reports the fast exchange of A-site cations between perovskite nanocrystals (NCs) made of different A-cations at room temperature. The exchange of A-cations is found to be as fast as the exchange of halide ions. It is shown that the optical properties of perovskite NCs can be finely tuned by the composition of A-cations, and different cations are evenly distributed in the lattice.
We report here fast A-site cation cross-exchange between APbX(3) 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.
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