Das Projekt "Substrat- und Sperrschichtoptimierung fuer im CVD-Verfahren hergestellte Duennschicht-Siliziumkristall-Solarzellen" wird vom Umweltbundesamt gefördert und von Fraunhofer-Institut für Solare Energiesysteme durchgeführt. Objective: A consortium has been formed by partners stemming from research and industry in order to make a further step towards the development of a cost-effective thin-film crystalline Si solar cell technology, based on thermally assisted Chemical Vapour Deposition (CVD) as deposition technique. This project should result in a thin-film crystalline Si low-cost PV module with a competitive cost/Wp. Description of work: The numerous possible options for thin-film crystalline Si solar cells (for substrate and barrier layer) and the absence of real progress on the level of equipment development for large-volume Si-layer deposition bear an inherent risk for subcritical research in this area. The consortium defined a clear strategy as far as substrates and deposition system are concerned. - Concerning the substrates, the number of options has been reduced to 3 options (Si-ribbons, a conductive ceramic: Si-infiltrated SiAlON and an insulating ceramic: SiAlON). - Together with the development and optimisation of the barrier layers, 4 technically relevant substrate/barrier layers schemes are investigated on cell level: Si-ribbons with and without barrier layer, Si-infiltrated SiAlON-substrates with a conductive SiC-layer, SiAlON-substrates and Si-ribbons with an insulating oxide barrier layer. After the Midterm Assessment, the number of substrate/barrier schemes is reduced to 2 (a conductive and non-conductive scheme), based on the results of a laboratory-type comparison of cells and the first cost projections. - Concerning the development of a high-throughput CVD-system, first steps toward a continuous Si-deposition system are taken. The consortium wishes to assess and reduce the running costs of such system. Specifically the costs associated with waste treatment and a reduction of the gas consumption through a H2-recirculation system will be looked at in more detail . In the first phase of the project these aspects will be studied. After the Midterm Assessment this deposition system will be intensively used for the growth of the Si-layers on the selected substrates, which will be processed into solar cells using processes, compatible with the industrial reality. Expected Results and Exploitation Plans: - The selection of a suitable low-cost substrate, compatible with Si-deposition by means of thermally-assisted Chemical Vapour Deposition (and possibly a liquid phase recrystallisation step); - The development of suitable barrier layers to prevent impurity indiffusion from the low-cost substrate into the active layer and to optimise internal reflection; - The assessment of a continuous high-throughput CVD-reactor, compatible with the requirements of the solar cell industry; - A module of 30x30 cm2 on the selected conductive substrate/barrier layer combination with an efficiency = 12 per cent obtained by a two-side contacting technology. Prime Contractor: Interuniversity microelectronics centre, microsyst4ems, components and packaging advanced solar cells
Das Projekt "Auswertung und Simulation von SHARP Photovoltaikanlagen" wird vom Umweltbundesamt gefördert und von Hochschule für Technik Stuttgart, Zentrum für angewandte Forschung an Fachhochschulen, Nachhaltige Energietechnik - zafh.net durchgeführt. Analyse von Einstrahlungsmesswerten und Photovoltaikmodulkennlinien; Fitting der Moduldaten, Erstellen von Parametersätzen; Datenvalidierung; Zusammenfassung von Ergebnissen; Berichtserstellung