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Perovskite Photovoltaic Materials: towards a flexible and low cost solar cell technology
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The exploitation of solar energy has become a necessity for sustainable development. One of the approaches has been the use of photovoltaic materials to convert this never-ending energy source in electrical energy. For this approach to be reliable, it ought to combine high efficiency with low production costs, while also promising flexible devices. Perovskite structured compounds act as the light harvesting material in solar cells and can be produced using simple methods such as solvent-engineering and spin coating. This work focuses on the study of perovskite compounds ABX3, where A is methylammonium or caesium cations, B is a lead cation and X is a halide ion such as bromine, chlorine and iodine. These films were produced via spin coating and the solvent-mix used was DMF:DMSO in different ratios (2:3, 3:2 and 4:1). The influence of toluene dropping during the spinning process was also studied. The careful tuning of these processes allowed the formation of poly-crystalline perovskite films, deposited on top of Glass/FTO/ZTO-NPs, that presented optical absorbance values between 80-90% and optical bandgaps of 1.5 eV for MAPbI3 and 1.7 eV for MAPbI2Br0.85Cl0.15, as expected from the state-of-art materials.
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Renewable energy Flexible and low-cost thin-film photovoltaics Solvent-engineering Solution-processed perovskite solar cells ZTO-NPs