Pilot Production of Bifacial Multicrystalline PERCT Cells Achieving 18.5% Efficiency and Singlefacial More Than 19%
| Autor: | Teppe, A., Wang, E., Guo, W., Gong, C., Voigt, O., Melnyk, I., Binaie Masouleh, F., Jooss, W., Fath, P. |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: | |
| DOI: | 10.4229/eupvsec20162016-2av.1.14 |
| Popis: | 32nd European Photovoltaic Solar Energy Conference and Exhibition; 610-614 In this paper we report about progress in the manufacturing of BIFACIAL and single facial multi crystalline PERCT solar cells in the pilot line of Shanxi Lu'an Solar Technology. Compared to previous publications the PERCT solar cell process sequence and parameters are modified. These modifications increased the average cell efficiency above 19%. The new process features are a high ohmic boron diffusion on the rear, a phosphorous emitter annealing step and the changed position of the laser ablation step. Unchanged is the passivated emitter rear totally diffused (PERT) cell design, realized by a BBr3 diffused BSF. The boron back surface field (B-BSF) is passivated by use of a PECVD SiNx deposited onto the remaining boron glass leading to a solar cell without any use of AlOx. Due to the B-BSF two different cell designs can be realized, each with its distinguished screen printed rear side metallisation schemes: Standard single facial aluminium and pad printing on to a laser opened rear side passivation and alternatively, the BIFACIAL screen printed silver finger grid. For the first time a low temperature front side emitter annealing step in addition to the well passivated rear side is implemented. This combination increases the solar cell efficiency of single facial cells to an average of 19.1% and a top efficiency of 19.6%. On BIFACIAL solar cells an average of 18.6% with 87% bifaciality and a top efficiency of 18.9% (measured on a standard, not conductive black chuck) are reached. At an albedo of 20% cost savings of 15% can be achieved on module level. To investigate the LID behaviour 6 modules were built using single facial mc PERCT cells. Three 60 cell modules reach an average power of 280.1W. Three 72 cell modules reach an average power of 335.6W. After light exposure of 5kWh /m² all 6 modules showed a low LID degradation of only 1.1% relative. |
| Databáze: | OpenAIRE |
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