Rear Junction Epitaxial Thin Film Solar Cells with Diffused Front Surface Field and Porous Silicon Back Reflectors
| Autor: | Kuzma Filipek, I., Récaman-Payo, M., Van Nieuwenhuysen, K., Van Hoeymissen, J., Beaucarne, G., Van Kerschaver, E., Poortmans, J., Mertens, R. |
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| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: | |
| DOI: | 10.4229/24theupvsec2009-3av.1.32 |
| Popis: | 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany; 2584-2588 Thin film silicon solar cells, consisting of an epitaxially grown active (base) layer deposited on a low quality, highly doped silicon substrate, are considered as a future alternative to crystalline bulk silicon cells incorporating many of the technologically attractive features. One of the benefits of these thin film epitaxial solar cells lies in the reduced consumption of high purity silicon feedstock. Moreover this technology enables a high degree of freedom regarding the design of the solar cell structure, since it can make use of unrestricted doping profiles and full solar cell diode stacks including emitters by chemical vapour deposition (CVD) processes as well as incorporation into the cell structure of intermediate processing steps prior epitaxial layer deposition. One of such intermediate step is implementation of the porous silicon optical reflector beneath the epi layer, reflecting low energy photons back to the active epitaxial layer. Another aspect of this work is to demonstrate a cell design where the emitter is situated at the rear of the cell directly on top of the reflector and is grown in situ by CVD technique. The purpose of this work is therefore twofold. A first aim is to demonstrate the use of such rear emitter epitaxial cell and show a proof of concept in comparison with the conventional cell with the junction at the front. On the other hand, we will discuss the issues associated with the introduction of such a concept together with the reflector in thin film technology and indicate possible improvement in cell design by PC1D simulations. |
| Databáze: | OpenAIRE |
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