Browsing by Author "Nouiri, A."

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    Photovoltaic applications of Light Beam Induced Current technique
    (Oum-El-Bouaghi University, 2011) Sayad, Y.; Kaminski, A.; Blanc, D.; Bazer-Bachi, B.; Lemiti, M.; Nouiri, A.
    Light or Laser beam induced current technique (LBIC) is conventionally used to measure minority charge carrier’s diffusion length LD by scanning a light spot away from collector (abrupt pn junction or Schottky contact). We show here the necessary precautions to be taken in order to apply this method on materials used in photovoltaics. We talk about SRLBIC or spectral response LBIC when this technique is combined with spectral reflectivity to allow determination of cells quantum efficiency. From internal quantum efficiency analysis, one deduces an effective carrier diffusion length, Leff, including bulk and surface recombinations. LBIC is, also, often used to reveal electrically active extended defects such as grain boundaries and dislocations, and to check passivation efficiency of fabricated cells.
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    Treatment of commercial aluminum by Nd
    (Oum-El-Bouaghi University, 2011) Baziz, L.; Nouiri, A.
    In this work, two types of commercial aluminum alloys (industrial and recovered aluminum) are studied. The surface is irradiated by Nd: Yag laser (l = 532 nm, with a pulse duration of 15 ns and an energy of 50 mJ). The experimental results show that the hardness profile can be divided into three regions. The melted area is the hardest region, Then, the hardness decreases sharply in the interface region between the melted area and the heat-affected zone.