Composition Dependent Optical Properties of Cesium Tin Halide Perovskites
Lekha Peedikkakandy
Indian Institute of Technology Bombay
Ms. Lekha Peedikakkandy is a PhD scholar in the Centre for Research in Nanotechnology and Science at Indian Institute of Technology–Bombay. She currently works on development of inorganic perovskite based all-solid state sensitized solar cells under the guidance of Prof. Parag Bhargava (MEMS-IIT-B). Her expertise also includes synthesis and characterization of organic-inorganic hybrid perovskites, metal (Au, Ag, Cu nanoparticles of different morphology) and metal chalcogenide (CdTe, CdS)nanoparticles for application in mesoscopic solar cells. She has several publications in the field of synthesis and characterization of nanoparticles and their application in plasmonic solar cells and mesoscopic thin film solar cells.
Abstract
Inorganic perovskites of the composition ABX3 (eg: CsSnX3, CsPbX3) exhibits structure dependent optical and electronic properties. There are few reports available on cesium tin halide (CsSnI3, CsSnBr3 and CsSnCl3) perovskites.... [ view full abstract ]
Inorganic perovskites of the composition ABX3 (eg: CsSnX3, CsPbX3) exhibits structure dependent optical and electronic properties. There are few reports available on cesium tin halide (CsSnI3, CsSnBr3 and CsSnCl3) perovskites. These perovskites show structure dependent band gap and electrical properties. In this study, we reports the structural and optical properties of varying compositions of lead free inorganic perovskite CsSnX3. Different compositions of CsSnX3 were prepared using room-temperature solution route method under inert atmosphere. Optical band gap studies for different anion compositions show a significant (53.5%) blue shift in the absorption spectra as the composition is varied from I to Br and Cl. As the halide composition was varied from I to Cl, an intense and tunable PL emission was observed at room temperature covering a wide range from near IR to Vis region (950–420 nm). Structure variation with anion substitution was studied using X-ray diffraction, structure for different compositions were found to change from orthorhombic for CsSnI3, cubic for CsSnBr3 and monoclinic for CsSnCl3 at room temperature. Further, nanoparticles of CsSnX3 were synthesized and the quantum confinement effects studied. It was observed that nanoparticles of CsSnI3 shows size tunable PL emission. The effect of cation substitution was also investigated, a less prominent shift was observed in the optical band gap by replacing Sn (II) cation with Pb (II) (0.7eV). With its excellent composition and size dependent optical properties, tin halide perovskites are an extremely promising material which can be used either as lead free perovskites or with reduced lead content for application in opto-electronic devices.
Attached figure shows: (a) Photoluminescence spectra and (b) XRD pattern for different compositions of CsSnX3 .
Authors
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Lekha Peedikkakandy
(Indian Institute of Technology Bombay)
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Parag Bhargava
(Indian Institute of Technology Bombay)
Topic Areas
Sol-Gel optical materials , Optical properties of nanostructures
Session
OS3-103a » Optical properties of nanostructures (14:30 - Friday, 9th December, Tower 24 - Room 103)
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