Person
Sofia Libraro
Related publications (6)
Microstructural and electrical characterization of high temperature passivating contacts for silicon solar cells
Recombination at metal/semiconductor interfaces represents the main limitation in mainstream c-Si solar cells, primarily based on the passivated emitter and rear cell (PERC) concept. Full-area passivating contacts based on SiOx/poly-Si stacks are a candida ...
EPFL202422.8% full-area bifacial n-PERT solar cells with rear side sputtered poly-Si (n) passivating contact
Christophe Ballif, Andrea Ingenito, Bertrand Yves Paul Paviet-Salomon, Sylvain Nicolay, Sofia Libraro
High-temperature compatible passivating contacts based on phosphorus doped polysilicon (poly-Si(n)) on a thin silicon oxide, employed on the rear side of bifacial n-PERT like solar cells provide an efficiency increase while being compatible with current ph ...
ELSEVIER2023Understanding and mitigating resistive losses in fired passivating contacts: role of the interfaces and optimization of the thermal budget
Christophe Ballif, Franz-Josef Haug, Aïcha Hessler-Wyser, Audrey Marie Isabelle Morisset, Julien Hurni, Ezgi Genç, Luca Massimiliano Antognini, Sofia Libraro
This work presents a study of p-type passivating contacts based on SiCx formed via a rapid thermal processing (RTP) step, using conditions compatible with the firing used to sinter screen-printed metallization pastes in industry. The contributions of the t ...
Amsterdam2023Impact of rapid thermal processing on bulk and surface recombination mechanisms in FZ silicon with fired passivating contacts
Christophe Ballif, Franz-Josef Haug, Andrea Ingenito, Audrey Marie Isabelle Morisset, Mario Joe Lehmann, Sofia Libraro
We investigate bulk and interface recombination in crystalline silicon with p-type fired passivating contacts. These consist of a chemical oxide and an in-situ doped layer of SiCx with low carbon content. Following a rapid thermal annealing to activate the ...
ELSEVIER2022Implementation and understanding of p plus fired rear hole selective tunnel oxide passivating contacts enabling > 22% conversion efficiency in p-type c-Si solar cells
Christophe Ballif, Franz-Josef Haug, Andrea Ingenito, Matthieu Despeisse, Sylvain Nicolay, Philippe Wyss, Sofia Libraro
Passivating contacts are key enablers for high efficiency c-Si solar cells. Here, we present our latest advancement in terms of implementation and understanding in fired passivating contacts (FPC) used as rear p + passivating contact in p-type solar cells. ...
ELSEVIER2021Contributions to the contact resistivity in fired tunnel-oxide passivating contacts for crystalline silicon solar cells
Christophe Ballif, Franz-Josef Haug, Andrea Ingenito, Sofia Libraro, Frank Meyer
We investigate the contact resistivity of p-type passivating contacts for silicon solar cells. Our contact structures are compatible with firing, a rapid annealing process similar to the one used for sintering of the screen-printed metallisation in solar c ...
2019