Figure 5From: Optimization of the dye-sensitized solar cell performance by mechanical compressionFE-SEM images analyzed by the ImageJ program. The black area means the unfilled space, and the white area means the TiO2 NPs. (a) As-deposited film and (b-f) after mechanical compression at various pressures, 61, 131, 279, 558, and 858 kg/cm2.Back to article page