Figure 1

Schematic of device architectures and energy band diagrams of FTO/TiO2/SFP/spiro-OMeTAD/Au (a) and FTO/CuI/SFP/PCBM/Al (b).
Schematic of device architectures and energy band diagrams of FTO/TiO2/SFP/spiro-OMeTAD/Au (a) and FTO/CuI/SFP/PCBM/Al (b).