Preparation of nanoscale inorganic CsPbIxBr3-x perovskite photosensitizers on the surface of mesoporous TiO2 film for solid-state sensitized solar cells

Yoo, S.-M.Lee, S.-Y.Kim, G.Hernandez, E.V.Mora-Ser?, I.Yoon, S.J.Shin, T.Lee, S.-H.Ahn, Seok hoonSong, M.-K.Kim, M.Lee, H.J.
Issue Date
Elsevier B.V.
Applied Surface Science, v.551
Metal chalcogenide quantum dot (QD)-like all-inorganic nanoscale perovskite photosensitizers of CsPbIxBr3-x were prepared on the surface of mesoscopic TiO2 film by a direct two-step spin-coating of lead and cesium halide precursors for application into solid-state dye-sensitized solar cells (DSSCs), as confirmed by impedance frequency response analysis. A few nanometer-sized hemisphere-shaped dots of CsPbIxBr3-x perovskites were deposited and distributed separately onto TiO2, which were checked by scanning and transmission electron microscopic (SEM and TEM) techniques. The as-deposited CsPbIxBr3-x perovskites were stable only in the case of including about 20% or more bromide in the composition of halides. When the bromide content increased in the ratio of halides of CsPbIxBr3-x, gradual decrease in lattice spacing and blue-shift of emission peaks were observed in X-ray diffraction (XRD) and photoluminescence (PL) measurements, respectively. These well-defined nano-particulate CsPbIxBr3-x perovskites were incorporated into solid-state DSSCs and tested as a new type of photosensitizers. The initial power conversion efficiency (PCE) of ca. 1.0?3.5% based on relatively thin mesoporous TiO2 film (~1 μm) looks promising with many parameters remaining for possibly more optimization. The best result, 3.79%, was obtained from CsPbI2.2Br0.80 25 days after initial measurement. These CsPbIxBr3-x-sensitized cells displayed a stable record of PCE over ~2 month and no hysteresis behavior in current-voltage traces. ? 2021 Elsevier B.V.
Blue shift; Bromine compounds; Cesium compounds; Dye-sensitized solar cells; Film preparation; Frequency response; Lead compounds; Nanostructured materials; Perovskite solar cells; Photosensitizers; Semiconductor quantum dots; Titanium dioxide; Dye- sensitized solar cells; Impedance spectroscopy; Inorganic perovskite; Inorganics; Mesoporous TiO$-2$; Nano scale; Nanoscale perovskite; Photosensitiser; TiO$-2$/ films; Two step depositions; Perovskite; Dye-sensitized solar cells; Impedance spectroscopy; Inorganic perovskites; Nanoscale perovskites; Photosensitizer; Two-step deposition
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