Browsing by Author "Monteiro, Pedro Duarte Alves"
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- Caracterização avançada de células fotovoltaicas de filme fino tipo CIGSPublication . Monteiro, Pedro Duarte Alves; Fernandes, Paulo Alexandre Franco PonteThe world is currently facing a global energy crisis which requires investment in new energy production technologies. Renewable energy sources are becoming increasingly important as an alternative and complement to fossil energy sources. A highlight in this scenario is solar energy, especially photovoltaic production, since it can be used in a variety of environments and scales. The use of solar energy has evolved over the years, with new structures and materials being sought for their development, one such solution being second-generation solar cells based on copper, indium, gallium and selenium, known as CIGS. However, mass production of these cells faces challenges such as oxidation and lack of sodium, which are difficult to overcome. To understand how these problems affect solar cells, a study based on electrical tests were carried out, including measurements of current vs voltage, external quantum efficiency, capacitance vs voltage, light intensity-dependent current vs voltage and temperature-dependent current vs voltage. The results show that both production problems have a negative impact on solar cells, with oxidation causing only a small reduction in efficiency, while a lack of sodium leads to the creation of electron barriers and high recombination rates, resulting in a significant loss of efficiency.