Presentation Details
| Electrical Stability of LECO-treated TOPCon Solar Cells Saman Sharbaf Kalaghichi1, Jan Lossen1, Jan Hoß1, Pirmin Preis1, Lazhar Rachdi1, Mertcan Comak1, Jürgen H.Werner2, Lejo Joseph Koduvelikulathu1, Vaibhav Kuruganti1. 1International Solar Energy Research Center Konstanz, Konstanz, Germany.2Institute for Photovoltaics, University of Stuttgart, Stuttgart, Germany |
Abstract
The laser-enhanced contact optimization (LECO) technique enables high conversion efficiencies η in tunnel oxide passivated contact (TOPCon) cells by allowing to contact higher sheet resistance emitters with a high passivation quality. Our study, in agreement with other reports, shows that such LECO-treated cells are not electrically stable and after exposure to a temperature step of around 450°C, their fill factor is significantly reduced. This study also shows that this effect is reversible; the degradation in the cell’s fill factor is recovered by applying another LECO treatment to degraded cells. Based on these observations, we hypothesize that local hyper-doping of silicon with boron occurs at the silver/silicon interface during the LECO process due to the melting and rapid cooling of the silicon melt and is prone to deactivation already at 450°C.
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