Industrial n-Type Bifacial Co-Diffused Rear Emitter Solar Cells with Boron Silicate Glass as Diffusion Source and Passivation
| Autor: | Wehmeier, N., Kajari-Schröder, S., Brendemühl, T., Nowack, A., Brendel, R., Dullweber, T. |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: | |
| DOI: | 10.4229/eupvsec20162016-2co.3.6 |
| Popis: | 32nd European Photovoltaic Solar Energy Conference and Exhibition; 443-446 We fabricate n-type rear emitter cells with a boron silicate glass (BSG) layer deposited by means of plasma-enhanced chemical vapor deposition (PECVD). The multi-functional stack consisting of the BSG layer and a PECVD silicon nitride (SiNz) capping layer acts both as a boron diffusion source and as the rear side passivation achieving saturation current densities of J0=40 fA/cm². For solar cell fabrication, the rear emitter is diffused from the BSG/SiNz stack while the front surface field (FSF) is diffused from POCl3 gas in a co-diffusion process. We present a novel n+ n p+ solar cell concept and name it BiCoRE (Bifacial Co-diffused Rear Emitter) cell that applies a screenprinted Al grid on the rear side for bifaciality. The process flow and complexity of the BiCoRE cells are very similar to industrial Passivated Emitter and Rear Cells (PERC). The BiCoRE cells processed on the very first batch demonstrate conversion efficiencies up to h=20.6% when illuminated from the front side, up to 16.1% rear-side efficiency and a bifaciality of 78%. |
| Databáze: | OpenAIRE |
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