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Descripción
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| Intermediate band solar cells (IBSCs) aim to improve the efficiency of single gap solar cells by making use of the energy of below bandgap energy photons. For that, an additional electronic band (the so-called intermediate band, IB) is created inside the semiconductor bandgap. There are several ways by which this IB can be created as, for example, by inserting some selected impurities into the semiconductor or by means of quantum dots. Under the impurity approach, the IB typically arises from the energy sates that these impurities introduce inside the semiconductor bandgap. Under the quantum dot approach, the IB is formed from the quantum confinement of the electrons in the QD. The seminar is structured in two parts. In the first part, the fundamentals of the IBSC approach are reviewed. These fundamentals emphasize aspects such as how the IB can be created and how non-radiative recombination, typically introduced by intermediate energy states in conventional semiconductors, can be minimized. Both strong point as weak points of the theory are reviewed. The second part summarizes the experimental results obtained up to date. In this respect, the main results refer to the demonstration of the absorption and conversion into photocurrent of below bandgap energy photons and to the preservation of the output voltage of the cell. Keys for the proper interpretation of the experimental results are given as well as hints for future research. | |
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Internacional
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Si |
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Nombre congreso
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Laboratoire de Photonique et de Nanostructures > Séminaires |
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Entidad organizadora
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Centre National de la Recherche Scientifique - UPR20 |
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Nacionalidad Entidad
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FRANCIA |
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Lugar/Ciudad de impartición
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Marcoussis (Francia) |
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Fecha inicio
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11/02/2014 |
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Fecha fin
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14/02/2014 |