| Summary: | In this study, we describe composited perovskite films based on the doping of lead cesium triiodide (CsPbI<sub>3</sub>) quantum dots (QDs) into methylammonium lead iodide (MAPbI<sub>3</sub>). CsPbI<sub>3</sub> QDs and MAPbI<sub>3</sub> were prepared by ligand-assisted re-precipitation and solution mixing, respectively. These films were optimized by oxygen plasma treatment, and the effect of powers from 0 to 80 W on the structural properties of the composited perovskite films is discussed. The experimental results showed that the light-harvesting ability of the films was enhanced at 20 W. The formation of the metastable state (lead(II) oxide and lead tetroxide) was demonstrated by peak differentiation-imitating. A low power enhanced the quality of the films due to the removal of organic impurities, whereas a high power caused surface damage in the films owing to the severe degradation of MAPbI<sub>3</sub>.
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