19 research outputs found

    Temperature dependent lifetime spectroscopy (TDLS) for the identification of metallic impurities

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    6th International Conference on Crystalline Silicon Photovoltaics (SiliconPV), CEA INES, Chambery, FRANCE, MAR 07-09, 2016International audienceThe paper is devoted to the identification of the metallic impurities in silicon wafers by using Temperature Dependent Lifetime Spectroscopy (TDLS). We consider the variation of all recombination mechanisms, intrinsic and extrinsic, to follow the variation of lifetime with the temperature. The extrinsic recombination mechanism is based on the standard Shockley-Read-Hall theory (SRH) [1], [2] and we simulated the variation of SRH lifetime for two impurities : gold and iron. The simulation results show that their SRH lifetime variations with the temperature are opposite and that the presence of a peak is characteristic of the impurity studied. Experimental measurements are displayed showing the identification of gold impurity by means of Phase-Shift TDLS (PS-TDLS) measurement. Thanks to these results, we demonstrate that PS-TDLS is an efficient method to identify gold and iron impurities at concentrations as low as 1.10(10)cm(-3) for a doping level of 1.10(15)cm(-3). (C) 2016 The Authors. Published by Elsevier Ltd

    Consequence of extruded linseed incorporation in sows and/or pigs' diets on performance

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    Session 11 "Evaluation and use of alternative pig nutrient sources " Texte intégral de 5 pagesInternational audienc

    [Recurrent transient ischemic stroke in a young patient with papillary fibroelastoma of the mitral valve and hyperhomocysteinemia. A case report].

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    International audienceWe describe a case of a young patient admitted for recurrent ischemic stroke caused by a papillary fibroelastoma of the mitral valve and a hyperhomocysteinemia. A papillary fibroelastoma is a benign cardiac tumor which can be associated with serious embolic complications. A moderate plasma level of hyperhomocysteinemia is considered as a risk factor of ischemic stroke. The authors suggest that this association increases the risk of ischemic stroke in their patient. The tumor was surgically removed to avoid new embolic events associated with a vitamin B supplementation. After surgery and acid folic supplementation, no recurrence was observed
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