Measured J_sc as a function of p⁺ poly-Si finger width and a linear fit to the data. The horizontal dashed line indicates the current of the TOPCon reference group (G1). The point markers show the individual measurement points and the box plots indicate the median value, the 25% and 75% quantiles and the minimum and maximum of the distribution. Additionally, an estimated value for J_sc is shown. This estimate only takes into account the expected current loss arising from the flat surface of the p⁺ poly-Si fingers but not the absorption within the p⁺ poly-Si itself.