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  1. Back-Surface Passivation for High-Efficiency Crystalline Silicon Solar Cells [electronic resource] : Final Technical Progress Report, September 2010 -- May 2012

    Washington, D.C. : United States. Dept. of Energy. Office of Energy Efficiency and Renewable Energy ; Oak Ridge, Tenn. : distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2012

    Final technical progress report for TetraSun, a Photovoltaic Technology Incubator awardee within the U.S. Department of Energy's (DOE) SunShot Program.

    Online OSTI

  2. Boron-doped back-surface fields using an aluminum-alloy process [electronic resource].

    Washington, D.C. : United States. Dept. of Energy. ; Oak Ridge, Tenn. : distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1997

    Boron-doped back-surface fields (BSF`s) have potentially superior performance compared to aluminum-doped BSF`s due to the higher solid solubility of boron compared to aluminum. However, conventional boron diffusions require a long, high temperature step that is both costly and incompatible with many photovoltaic-grade crystalline-silicon materials. We examined a process that uses a relatively low-temperature aluminum-alloy process to obtain a boron-doped BSF by doping the aluminum with boron. In agreement with theoretical expectations, we found that thicker aluminum layers and higher boron doping levels improved the performance of aluminum-alloyed BSF`s.

    Online OSTI

  3. Direct Experimental Evidence of Back-Surface Acceleration from Laser-Irradiated Foils [electronic resource].

    Washington, D.C. : United States. Dept. of Energy ; Oak Ridge, Tenn. : distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2004

    Au foils were irradiated with a 100-TW, 100-fs laser at intensities greater than 10²° W/cm² producing proton beams with a total yield of ≈ 10¹¹ and maximum proton energy of > 9 MeV. Removing contamination from the back surface of Au foils with an Ar-ion sputter gun reduced the total yield of accelerated protons to less than 1% of the yield observed without removing contamination. Removing contamination the front surface (laser-interaction side) of the target had no observable effect on the proton beam. We present a one-dimensional particle-in-cell simulation that models the experiment. Both experimental and simulation results are consistent with the back-surface acceleration mechanism described in the text.

    Online OSTI

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