Controllable Colloidal Synthesis of MAPbI 3 Perovskite Nanocrystals for Dual-Mode Optoelectronic Applications.

This study demonstrates an acetate ligand (AcO - )-assisted strategy for the controllable and tunable synthesis of colloidal methylammonium lead iodide (MAPbI 3 ) perovskite nanocrystals (PNCs) for efficient photovoltaic and photodetector devices. The size of colloidal MAPbI 3 PNCs can be tuned from 9 to 20 nm by changing the AcO - /MA ratio in the reaction precursor. In situ observations and detailed characterization results show that the incorporation of the AcO - ligand alters the formation of PbI 6 octahedral cages, which controls PNC growth. A well-optimized AcO - /MA ratio affords MAPbI 3 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 11 Jones, respectively. This study provides an avenue to further the precisely controllable synthesis of hybrid PNCs for multifunctional optoelectronic applications.