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(a–c) Schematic drawing of the structure of a POLO2-IBC solar cell with (a) a thermally grown SiO2 layer, (b) Al2O3/SiNy/SiOz or (c) PECVD-SiOz/SiNy stack as the rear side dielectric layer. (d–f) Spatially resolved carrier lifetime of the cell structures shown in (a–c) at ∼0.25 suns measured by the ILM method. The active cell areas of the seven solar cells are marked with squares a–g.
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