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Gorostiza, Anastacia De
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article
Cesium Methylammonium Lead Iodide (Cs<sub><i>x</i></sub>MA<sub>1−<i>x</i></sub>PbI<sub>3</sub>) Nanocrystals with Wide Range Cation Composition Tuning and Enhanced Thermal Stability of the Perovskite Phase
Abstract
<jats:title>Abstract</jats:title><jats:p>Cesium methylammonium lead iodide (Cs<jats:sub><jats:italic>x</jats:italic></jats:sub>MA<jats:sub>1−<jats:italic>x</jats:italic></jats:sub>PbI<jats:sub>3</jats:sub>) nanocrystals were obtained with a wide range of A‐site Cs‐MA compositions by post‐synthetic, room temperature cation exchange between CsPbI<jats:sub>3</jats:sub> nanocrystals and MAPbI<jats:sub>3</jats:sub> nanocrystals. The alloyed Cs<jats:sub><jats:italic>x</jats:italic></jats:sub>MA<jats:sub>1−<jats:italic>x</jats:italic></jats:sub>PbI<jats:sub>3</jats:sub> nanocrystals retain their photoactive perovskite phase with incorporated Cs content, <jats:italic>x</jats:italic>, as high as 0.74 and the expected composition‐tunable photoluminescence (PL). Excess methylammonium oleate from the reaction mixture in the MAPbI<jats:sub>3</jats:sub> nanocrystal dispersions was necessary to obtain fast Cs‐MA cation exchange. The phase transformation and degradation kinetics of films of Cs<jats:sub><jats:italic>x</jats:italic></jats:sub>MA<jats:sub>1−<jats:italic>x</jats:italic></jats:sub>PbI<jats:sub>3</jats:sub> nanocrystals were measured and modeled using an Avrami expression. The transformation kinetics were significantly slower than those of the parent CsPbI<jats:sub>3</jats:sub> and MAPbI<jats:sub>3</jats:sub> nanocrystals, with Avrami rate constants, <jats:italic>k</jats:italic>, at least an order of magnitude smaller. These results affirm that A‐site cation alloying is a promising strategy for stabilizing iodide‐based perovskites.</jats:p>