Jonas Geissbühler

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Back-Contacted Silicon Heterojunction Solar Cells With Efficiency >21%

Christophe Ballif, Antoine Descoeudres, Bertrand Yves Paul Paviet-Salomon, Jonas Geissbühler, Stefaan De Wolf, Andrea Tomasi, Silvia Martin de Nicolas Agut

We report on the fabrication of back-contacted silicon heterojunction solar cells with conversion efficiencies above 21%. Our process technology relies solely on simple and size-scalable patterning methods, with no high-temperature steps. Using in situ sha ...

Ieee-Inst Electrical Electronics Engineers Inc2014

Amorphous/crystalline silicon interface defects induced by hydrogen plasma treatments

Christophe Ballif, Duncan Thomas Lindsay Alexander, Jonas Geissbühler, Stefaan De Wolf, Loris Barraud, Johannes Peter Seif, Bénédicte Demaurex

Excellent amorphous/crystalline silicon interface passivation is of extreme importance for high-efficiency silicon heterojunction solar cells. This can be obtained by inserting hydrogen-plasma treatments during deposition of the amorphous silicon passivati ...