A Low-Cost Synthetic Route of FAPbI 3 Quantum Dots in Air at Atmospheric Pressure: The Role of Zinc Iodide Additives.

Perovskite quantum dots (PQDs) have shown great promise in optoelectronic device applications. Typically, a traditional hot-injection method with heating and high vacuum pressure is used to synthesize these colloidal nanoparticles. In this article, we report a low-cost synthetic method for FAPbI 3 PQDs in air at atmospheric pressure with the assistance of ZnI 2 . Compared with the FAPbI 3 PQDs synthesized under vacuum/N 2 condition, the air-synthesized Zn:FAPbI 3 PQDs exhibit the same crystalline structure with a similar preferential crystallographic orientation but demonstrate higher colloidal stability and higher production yield. Furthermore, we examine the influence of ZnI 2 during the synthesis process on morphologies and optoelectronic properties. The results show that the mean size of the obtained FAPbI 3 PQDs is decreased by increasing the amount of added ZnI 2 . More importantly, introducing an optimal amount of ZnI 2 into the Pb source precursor enables increasing the carrier lifetime of FAPbI 3 PQDs, showing the potential beneficial effect on device performance.