Publication: Photoelectric characterization of solar cells based on III-V semiconductors
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Publication date
2021-09
Defense date
2021-10-14
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García-Tabarés Valdivieso, Elisa
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Abstract
This bachelor thesis is focused on the theoretical background study and its subsequent experimental application of solar cells based on III-V semiconductors with the aim of understanding the relationship between the band-gap of the materials and their electrical performance (i.e. quantum efficiency). Furthermore, the effect of the material’s properties on the quantum efficiency is analysed, with the aim of optimizing the parameters to improve the efficiency of future solar devices. These III-V semiconductors that have excellent properties and different ranges of band-gap are connected in series forming multi-junction solar cells. Thus, the light that is not absorbed by the upper layers is absorbed in the lower layers, so with this type of cells the fitting of the solar devices to the solar spectrum is improved.
Through the characterization of the tested III-V solar cells using a spectral response measurement equipment, it was proved that as the band-gap energy decreases, the quantum efficiency increases as does the absorption of light wavelengths available, so the greater the energy of the band-gap, the smaller the efficiencies reached.
A different approach for a potential increase of the solar cell efficiency is also described and used during this project. This approach is based on a simulation tool. Thanks to those simulations, the effect of different modular parameters on the performance of the devices has been studied and the obtained results can be applied in the manufacture of future devices. Moreover, this study can be used as a feedback tool for upcoming experimental research.
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Keywords
Solar cells, Semiconductors, Solar spectrum, Spectral response, Quantum efficiency