Figure 3From: 3-D solar cells by electrochemical-deposited Se layer as extremely-thin absorber and hole conducting layer on nanocrystalline TiO2 electrodeSEM images of cross-sections and surface annealings. Cross-section (a) and surface (b) of the porous TiO2/compact TiO2/FTO/glass, the cross-section (c) and surface (d) of Se-coated porous TiO2 before annealing, and the cross-section (e) and surface (f) of Se-coated porous TiO2 after annealing at 200°C for 3 min.Back to article page