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SEM images of the sintered samples of SnO2-based solid solution with TiO2 are provided. Non-doped samples (a,c) and Li-doped (5 mol%, b,d) samples are presented. Images (a,b) depict the surface of the films, while (c,d) show cross-sectional images of the ETL/FTO substrates. The ETL layers are highlighted in blue.
