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Titel:
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Status of n-type solar cells for low-cost industrial production
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Auteur(s):
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Gepubliceerd door:
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Publicatie datum:
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ECN
Zonne-energie
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21-9-2009
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ECN publicatienummer:
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Publicatie type:
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ECN-M--09-017
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Conferentiebijdrage
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Aantal pagina's:
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Volledige tekst:
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5
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Download PDF
(630kB)
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Gepresenteerd op: 24th European Photovoltaic Solar Energy Conference and Exhibition, Hamburg, Germany, 21-25 september 2009.
Samenvatting:
We have reached 18.6% efficiency on large area (243 cm2) n-type crystalline silicon solar cells using conventional industrial processes like tube furnace diffusion and screen-printing. The 18.6% cell is a bifacial one with a boron emitter at the front side and a phosphorous back-surface-field (BSF). We have applied an industrially feasible boron/phosphorous co-diffusion process, and a simple wet-chemical oxidation process to passivate the highly-doped boron emitter. In this paper we will compare our results to those obtained by others. Another cell type discussed in the paper is an n-type cell with the junction at the rear. This cell has a screen-printed aluminium alloyed emitter, and the processing is comparable to conventional p-type cells. We have obtained an efficiency of 17.4% with this n-type cell. Possible improvements discussed in literature are presented as well.
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