Abstract
In the present work, we report the synthesis of lead free cesium antimony iodide (Cs3Sb2I9) perovskite thin films by rapid iodization of Sb2S3-CsCl precursors under ambient conditions. In this method, first, Sb2S3 thin films were deposited using a chemical bath containing SbCl3 and Na2S2O3, following drop casting and spin coating of CsCl with varying molarities. These Sb2S3-CsCl precursor layers were iodized and the resulting films were investigated for their structure and morphology. X-ray diffraction and scanning electron microscopy studies revealed the formation of phase pure hexagonal structured Cs3Sb2I9 (P63/mmc) thin films with uniform surface coverage, exhibiting distinct morphologies for drop casting and spin coating cases. Moreover, Cs3Sb2I9 films obtained by varying iodization times (30 s – 10 min) were analyzed. The optical studies showed a direct band gap in the range of ∼ 1.8–1.96 eV for both drop casting and spin coating films. The Cs3Sb2I9 films were photoconductive and exhibited photodetection properties at zero bias voltage, functioning as self-powered photodetecors. Furthermore, we investigated stability of the self-powered photodetectors. Our work offers a facile synthesis process for producing photoconductive Cs3Sb2I9 thin films with inherent self-biased photodetection properties.
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