J. Creager

Universität Konstanz, Constance, Baden-Württemberg, Germany

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Publications (9)0 Total impact

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    ABSTRACT: This paper will report on the work performed by BP Solar during the first two years of NREL PVMaT subcontract #ZDO-2-30628-03. The major objectives of this program are to continue the advancement of BP Solar's multicrystalline silicon manufacturing technology to: increase ingot size; improve ingot material quality; develop wire saws to slice 100 μm thick silicon wafers; develop equipment for demounting and handling of ultra-thin wafers; develop cell processes that produce cells with efficiencies of at least 15.4% at an overall yield exceeding 95%; expand existing in-line manufacturing data reporting systems; establish a 50 MW factory model; and facilitate an increase in the silicon feedstock industry's production capacity for lower-cost solar grade feedstock.
    Preview · Conference Paper · Feb 2005
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    ABSTRACT: Results of our high throughput mechanical texturization technology suitable for highly efficient multi Si solar cells are addressed. In this work different structuring tool designs have been investigated for implementation in a low cost screen printing multi Si solar cell process. The benefit of the mechanical texturization on the cell performance is shown in experiment and simulation before and after encapsulation. As a further topic, results of multicrystalline solar cells metallized with a novel printing method-the roller printing technique-are shown. It is based on self-aligned mask-free roller printing of metal, dopant or masking pastes on protruding regions of V-grooved silicon solar cells
    No preview · Conference Paper · Jan 1997
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    ABSTRACT: The objectives of this NREL sponsored Photovoltaic Manufacturing Technology (PVMaT) Program are to advance Solarex's cast polycrystalline silicon manufacturing technology, reduce module production cost in half, increase module performance and expand Solarex's commercial production capacity by a factor of three. To meet these objectives Solarex has: (1) modified the casting process and stations to grow larger ingots; (2) developed wire saws to cut wafers on as little as 400 μm centers; (3) developed a laboratory process to increase cell efficiencies to 15% using back surface fields, mechanical texturing and gettering; (4) modified the casting, wires saw and cell processes in order to fabricate larger (15.2 cm by 15.2 cm) wafers and cells; (5) improved the automated assembly of modules, reducing labor requirements and increasing throughput; (6) developed a frameless module with a lower cost backsheet and a simple, low cost electrical termination system; and (7) determined the stress levels leading to wafer breakage and designed equipment for automated handling of thin wafers
    No preview · Conference Paper · Jun 1996
  • S. Narayanan · J. Creager · M. Roy · J. Wohlgemuth
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    ABSTRACT: In commercial production, Solarex's baseline multicrystalline solar cells are 130 cm<sup>2</sup> in area with an average efficiency of approximately 13%. One of the goals of Solarex's Photovoltaic Manufacturing Technology (PVMaT) program (sponsored by NREL), is the development of a cost-effective cell process to achieve an average cell efficiency of 15% on large-area substrates. In this paper, the details of the efforts to scale-up the area of the cells from 130 cm<sup>2</sup> to 230 cm<sup>2</sup> and the details of the development of an integrated high efficiency solar cell process sequence are reported
    No preview · Conference Paper · Jun 1996
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    ABSTRACT: Solarex has begun a process and product development program under the NREL sponsored Photovoltaic Manufacturing Technology (PVMaT) Program. The two major objectives of this program are to reduce the manufacturing cost for polycrystalline silicon PV modules to less than $1.20/watt and to increase the manufacturing capacity by a factor of three. To meet these objectives Solarex has proposed: (1) to increase the polycrystalline wafer size to 15 cm by 15 cm; (2) to use wire saws to cut wafers on 400 μm centers; (3) to increase cell efficiencies to 15%; (4) to improve the automated assembly of modules; (5) to develop a frameless module with a low cost backsheet and electrical termination system; and (6) to develop the equipment necessary for automated handling of thin 15 cm by 15 cm wafers and cells. This paper discusses the first year program efforts in the first five technical areas
    No preview · Conference Paper · Jan 1995
  • S. Narayanan · J. Creager · S. Roncin · A. Rohatgi · Z. Chen
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    ABSTRACT: One of the objectives of ongoing research at Solarex is to evolve process sequences that are compatible with high volume production, while reducing the processing cost of buried contact cells. In the paper, the impact of phosphorus gettering and the application of an antireflection coating with a higher refractive index than that of SiO<sub>2</sub> are discussed. Substantial improvement in the efficiency of the buried contact cells due to phosphorus gettering and incorporation of titanium dioxide antireflection coating is reported
    No preview · Conference Paper · Jan 1995
  • J.H. Wohlgemuth · T. Koval · D. Whitehouse · J. Creager
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    ABSTRACT: It is important to maximize the amount of sunlight optically coupled into a solar cell. The usual approach to evaluate optical coupling is to fabricate solar cells and then to measure their performance under standard test conditions, using the short circuit current as the figure of merit. This approach suffers from several short comings, including spectral mismatch errors in the measurement and process induced variations in the performance. This paper presents an improved methodology for evaluating optical coupling, based on measuring the reflectance of sample surfaces as a function of wavelength. The effect of using this surface geometry on a particular cell can then be calculated using values of previously measured internal quantum efficiency for the cell technology selected. Data on a variety of surface texture treatments are presented
    No preview · Conference Paper · Jan 1995
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    ABSTRACT: Solarex has applied the buried contact solar cell technology for one-Sun and 18-Sun linear focus concentrator applications. This paper presents results for large area cells fabricated on FZ, CZ and polycrystalline silicon. Chemically textured FZ yields the highest efficiency, with one-Sun cells exceeding 18%. Chemically and mechanically textured CZ cells have exceeded 16% at one-Sun and nearly 19% under 18 Suns concentration. Large area mechanically textured polycrystalline solar cells have been fabricated with efficiencies up to 14.7%. All of these results have been achieved using a dicing saw to cut the grooves
    No preview · Conference Paper · Jun 1993
  • S. Narayanan · J. Wohlgemuth · J. Creager · S. Roncin · M. Perry

    No preview · Article ·

Publication Stats

38 Citations


  • 1997
    • Universität Konstanz
      • Department of Physics
      Constance, Baden-Württemberg, Germany
  • 1996
    • University of Texas at Arlington
      • Automation and Robotics Research Institute
      Arlington, Texas, United States