Abstract
The PbI2 thin films were prepared by 461 mg PbI2/ 1 ml DMF solution with inclusion of 1, 2, 3 and 5 vol% hydriodic acid. The lead iodide thin films were coated on indium tin oxide/PEDOT:PSS substrates at different spin speeds; 3000 rpm, 4000 rpm and 5000 rpm for 60 s. The influence of hydriodic acid on the crystallization was investigated using X-ray diffractometer and the analysis revealed that the 2 vol% hydriodic acid is crucial value for the crystallinity and damage threshold of the under layer PEDOT:PSS. Scanning electron microscopy showed that by altering the volume of the acid the morphology of the films can be well controlled. Especially band gap, changed optical properties as a reflection of acid effect were also observed by absorbance and transmittance behavior obtained by UV–vis spectrophotometer. Consequently, it is conclude that the lead iodide film prepared with using the precursor solution including 2 vol% HI at 4000 rpm has best crystallinity and nearly void-free smooth morphology.
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