Description: Das Projekt "Large grained, low stress multi-crystalline silicon thin film solar cells on glass by a novel combined diode laser and solid phase crystallization process (HIGH-EF)" wird vom Umweltbundesamt gefördert und von Institut für Photonische Technologien e.V. durchgeführt. Objective: HIGH-EF will provide the silicon thin film photovoltaic (PV) industry with a unique process allowing for high solar cell efficiencies (potential for greater than 10 percent) by large, low defective grains and low stress levels in the material at competitive production costs. This process is based on a combination of melt-mediated crystallization of an amorphous silicon (a-Si) seed layer (less than 500 nm thickness) and epitaxial thickening (to greater than 2 mym) of the seed layer by a solid phase crystallization (SPC) process. Melting the a-Si layer and solidifying large grains (about 100 mym) will be obtained by scanning a beam of a diode laser array. Epitaxial thickening of the large grained seed layer (including a pn-junction) is realized by deposition of doped a-Si atop the seed layer and a subsequent SPC process by way of a furnace anneal. Such a combined laser-SPC process represents a major break-through in silicon thin film photovoltaics on glass as it will substantially enhance the grain size and reduce the defect density and stress levels of multi-crystalline thin layers on glass compared e.g. to standard SPC processes on glass, which provide grains less than 10 mym in diameter with a high density of internal extended defects, which all hamper good solar cell efficiencies. It is, however, essential for the industrial laser-SPC implementation that such a process will not be more expensive than the established pure SPC process. A low cost laser processing will be developed in HIGH-EF using highly efficient laser diodes, combined to form a line focus that allows the crystallization of an entire module (e.g. 1.4 m x 1 m in the production line or 30 cm x 39 cm in the research line) within a single scan. Specific attention has been given to identify each competence needed for the success of the project and to identify the relevant partners forming a balanced, multi-disciplinary consortium gathering 7 organizations from 4 different member states with 1 associated country.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Glas ? Getreide ? Halbleiterlaser ? Silikon ? Werkstoff ? Photovoltaikanlage ? Dünnschichtsolarzelle ? Laser ? Photovoltaik ? Saatgut ? Silizium ? Solarzelle ? Solarindustrie ? Feststoff ? Solartechnik ? Stress ? Verfahrenskombination ? Interdisziplinarität ? Korngröße ? Kostensenkung ? Kristallisation ? Produktionskosten ? Wirkungsgrad ? Deposition ? Schmelzen ? Energieeffizienz ? Länderkompetenz ? Ofen ? Effizienzsteigerung ? FP7-ENERGY ? Schmelzbad ?
Region: Thuringia
Bounding box: 11° .. 11° x 50.91667° .. 50.91667°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2008-01-01 - 2010-12-31
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