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Experimental implementation of a silicon wafer tandem solar cell

: Gimpel, T.; Kontermann, S.; Buck, T.; Baumann, A.L.; Günther, K.M.; Wefringhaus, E.; Mihailetchi, V.; Lemp, E.; Rudolph, D.; Theobald, J.; Schade, W.

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Energy Procedia 55 (2014), pp.186-189
ISSN: 1876-6102
International Conference on Crystalline Silicon Photovoltaics (SiliconPV) <4, 2014, S'Hertogenbosch>
Conference Paper, Journal Article, Electronic Publication
Fraunhofer HHI ()

We combine aluminum back surface field (Al-BSF) solar cell precursors with an additional rear side infrared active floating emitter in a tandem cell configuration. This emitter is implemented area selectively by fs-laser hyperdoping in a sulfurous atmosphere. Its design as a floating emitter conceals losses induced by the laser process as long as n-doping occurs. All processes are adapted and supplemented by just a single new process step.