Experimental implementation of a silicon wafer tandem solar cell

Gimpel, Thomas; Kontermann, Stefan; Buck, Thomas; Baumann, Anna, Lena; Günther, Kay-Michael; Wefringhaus, Eckard; Mihailetchi, Valentin; Lemp, Engelbert; Rudolph, Dominik; Theobald, Jens; Schade, Wolfgang

doi:10.1016/j.egypro.2014.08.114

published

Experimental implementation of a silicon wafer tandem solar cell

Gimpel, Thomas; Kontermann, Stefan; Buck, Thomas; Baumann, Anna Lena; Günther, Kay-Michael; Wefringhaus, Eckard; Mihailetchi, Valentin; Lemp, Engelbert; Rudolph, Dominik; Theobald, Jens; Schade, Wolfgang

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.