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-Full-text |
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 |