Controllable Colloidal Synthesis of MAPbI<sub>3</sub> Perovskite Nanocrystals for Dual-Mode Optoelectronic Applications.
basic_science · Level V
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- Record sourced from PubMed, PMID 37747809.
- Also identified by DOI 10.1021/acs.nanolett.3c03354.
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Abstract
This study demonstrates an acetate ligand (AcO<sup>-</sup>)-assisted strategy for the controllable and tunable synthesis of colloidal methylammonium lead iodide (MAPbI<sub>3</sub>) perovskite nanocrystals (PNCs) for efficient photovoltaic and photodetector devices. The size of colloidal MAPbI<sub>3</sub> PNCs can be tuned from 9 to 20 nm by changing the AcO<sup>-</sup>/MA ratio in the reaction precursor. <i>In situ</i> observations and detailed characterization results show that the incorporation of the AcO<sup>-</sup> ligand alters the formation of PbI<sub>6</sub> octahedral cages, which controls PNC growth. A well-optimized AcO<sup>-</sup>/MA ratio affords MAPbI<sub>3</sub> PNCs with a low defect density, a long carrier lifetime, and unique solid-state isotropic properties, which can be used to fabricate solution-processed dual-mode photovoltaic and photodetector devices with a conversion efficiency of 13.34% and a detectivity of 2 × 10<sup>11</sup> Jones, respectively. This study provides an avenue to further the precisely controllable synthesis of hybrid PNCs for multifunctional optoelectronic applications.