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dc.contributor.advisor Sewvandi GA
dc.contributor.author Gunasekara HKYPG
dc.date.accessioned 2020
dc.date.available 2020
dc.date.issued 2020
dc.identifier.uri http://dl.lib.uom.lk/handle/123/16773
dc.description.abstract Hybrid Organic-Inorganic Perovskites (HOIP) have been studied extensively and grown popular. Especially in Three-dimensional (3D) Perovskites, achieving power conversion efficiency (PCE) exceeds 23%. Nevertheless, some of the morphological imperfections will limit their structural capabilities. Pinholes in discontinuous perovskite films induces the huge leakage current which can cut down the device efficiency and creates a short circuit. Therefore, it is essential to deposit a compact film with passivated defects. Two-dimensional (2D) halide perovskites, conversely attracted significant attention and become a positive alternative with their uncomplicated synthesis, stability, and excellent photoelectric properties. This study, investigates the formation and properties of 2D Tetrabutylammonium lead halide (TBAPbBrxI3-x) HOIP. Tetrabutylammonium ion is a large cation, and more likely forms a 2D perovskite structure which was confirmed by the XRD spectrum. Substantiate by SEM images, TBAPbBrxI3-x establishing and favors crystals with enhance orientation and few grain boundaries and. However, the absorption spectra of the film shows an excitonic peak at 411 nm and a clear band edge at 450 nm. Resulting in poor absorbance in the visible range, with optical band gap of 2.76 eV, narrowing the ability to use TBAPbBrxI3-x alone in solar cells. Conversely, TBAPbBrxI3-x can use as separate capping layer on the top of 3D perovskite layer, enhancing the properties of the 3D perovskite layer. Incorporating TBAPbBrxI3-x into CH3NH3PbI3 shows a better film formation with few holes. The application of mixed perovskite layers incorporated solar cells will result in better structural and optoelectronic properties. en_US
dc.language.iso en en_US
dc.subject MATERIAL SCIENCE AND ENGINEERING-Dissertations en_US
dc.subject MATERIALS SCIENCE-Dissertations en_US
dc.subject HYBRID ORGANIC-INORGANIC PEROVSKITES en_US
dc.subject HYBRID ORGANIC-INORGANIC PEROVSKITES-Pinholes en_US
dc.subject TETRABUTYLAMMONIUM LEAD HALIDE en_US
dc.subject PHOTOVOLTAIC CELLS en_US
dc.subject SOLAR CELLS en_US
dc.title 2D - 3D Hybrid perovskites for perovskite solar cells en_US
dc.type Thesis-Abstract en_US
dc.identifier.faculty Engineering en_US
dc.identifier.degree MSc in Material Science en_US
dc.identifier.department Department of Materials Science & Engineering en_US
dc.date.accept 2020
dc.identifier.accno TH4248 en_US


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