INDUSTRIALLY FEASIBLE MC-SI METAL WRAP THROUGH (MWT) SOLAR CELLS WITH HIGH EMITTER SHEET RESISTANCES EXCEEDING 16% EFFICIENCY

摘要: On the way to higher efficiencies, back contact solar cells seem be a promising alternative conventional screen-printed cells. Especially, MWT (metal wrap through) cell concept with only two additional process steps compared is appropriate for fast transfer industry. Hence, pilot-line based on new design was developed and tested. Several batches of about 1000 mc-Si were successfully produced at ISE's PV-TEC pilot-line. Cell efficiencies up 16.2% are achieved an emitter sheet resistance 65 Ω/sq. Compared conventionally processed made same mc Si-block, efficiency gain 0.5% observed. The main reason high short circuit current due absence bus bars front. Furthermore, interconnection possible thus less serial losses in tabs. Therefore, 0.2%abs. standard module technology using tabbing technology.