Advancements in the utilization of screen-printed boron doping paste for high efficiency back-contact back-junction silicon solar cells

–- Screen printed boron doping paste can be used as a cost-effective and highly flexible dopant source in silicon photovoltaics. In combination with a co-diffusion approach, it can help mitigate some of the increased costs advanced solar cell concepts inherit. Aiming at the fabrication of high efficiency back-contact back-junction solar cells, we investigate the limitations of direct structured application regarding minimal feature sizes. We find minimal feature sizes of 75 and $120 \mu \mathrm{m}$ for n ++ and $p ^{\mathbf{++}}$\textbf{-doped regions, respectively. We also demonstrate a fully compatible and homogeneous ($\Delta R_{\Box}/ R_{\Box} = {3}{\%}_{rel}$) co-diffusion process, creating all dopings at once.