Development of a point-contact solar cell using high-volume processing techniques. Final report.

摘要

Point-contact solar cells have achieved the highest efficiencies recorded to date for silicon cells, reaching 28.2% at 10 watts/cm(sup 2). Though this technology offers several advantages over conventional bifacial cells, special process techniques are needed to optimize performance. Point-contact cells require a thin base, high bulk lifetime, low surface recombination velocities, effective light trapping, and effective heat sinking. These requirements were addressed in the development of a high-efficiency cell process using high-volume, integrated-circuit process equipment. Two methods developed for producing thin cells were compared in yield and manufacturability. Techniques were developed for processing thin cells using automated production equipment. The fabrication process was designed to minimize lifetime degradation. Minority carrier lifetime data are presented for a full range of process steps. Three optical textures were compared in an experimental light-trapping study. These process techniques were combined to produce several types of cells. The best has achieved an efficiency of 25.0% at 87 suns. 23 refs., 16 figs., 7 tabs. (ERA citation 15:032284)