Tobias Fellmeth

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We present small-area metal wrap through solar cells with passivated rear side (MWT-PERC), screen-printed metallization, and a homogeneous industrial-like emitter showing an efficiency of 20.2%. A comparison of H-pattern reference cells and cells with aluminum back surface field confirms the advantages of the MWT-PERC approach and reveals significant(More)
Fast and accurate simulation tools are key to increasing our understanding of silicon-based solar cells. A lucid graphical unit interface and experimentally obtained input parameters help make these tools accessible for a wide range of users. In this paper, we present a fast Excel tool based on the well-known two-diode model supporting conventional and(More)
We present a standard p<sup>+</sup>pn<sup>+</sup> solar cell device exhibiting a full-area aluminum back surface field (BSF) and a conversion efficiency of 20.1%. The front side features a shallow emitter which has been exposed to a short oxidation step and reduces the emitter dark saturation current density <i>j</i><sub>0</sub><i>e</i> to 160(More)
Starting from the conventional silicon solar cell that features a single diffused shallow emitter and screen-printed contacts on both sides, we discuss possible ways to extend one- and multiple-sun conversion efficiency. From this perspective, the metal wrap through (MWT) concept that also features a full area aluminum back surface field (BSF) is discussed.(More)
A versatile interconnection and receiver concept for back contact low concentrating crystalline solar cells is presented. The key feature is the AP-C-MWT cell which allows for any cell formats as a multiple of 22.5 &#x00D7; 10 mm<sup>2</sup>. We demon-strate the feasibility of an adequate receiver concept and show the electrical optimization steps for a(More)
Realizing narrow contact fingers with low lateral resistance is a major goal for the front-side metallization of silicon solar cells. The formation of screen- or stencil-printed contact fingers is governed by a variety of influencing factors. One of these factors is the surface roughness of the textured silicon wafer. However, only a few investigations have(More)
Progress in metallization techniques and emitter formation technologies needs fast and reliable tools for the optimization of the metallization pattern of crystalline silicon solar cells. We present and compare three models and discuss their validity and accuracy for different emitter sheet, finger and contact resistances, and finger widths. All models(More)
We report latest progress in combining the Metal Wrap Trough (MWT) cell structure with passivated back surfaces (PERC approach). By adapting our industrial process sequences, we integrate MWT and PERC structures in remarkably lean process sequences, while industrially available equipment is being used in our PV-TEC pilot line. We demonstrate 19.4 % (18.9 %(More)
The authors combine a silicon-based metal-wrap-through architecture with a unit cell designed for the purpose of operating under concentrated irradiance, called AP-MWT solar cell. On the illuminated side, the negative polarity is electrically separated by using an emitter window surrounding the perimeter of each unit cell. The final solar cell device(More)
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