A PCBM-Modified TiO2 Blocking Layer towards Efficient Perovskite Solar Cells

<div>Cross-section image of the complete device with the structure of FTO/TiO2/PCBM/CH3NH3PbI3−xClx/spiro-OMeTAD/Ag. The TiO2 spin coating speed was fixed at 4000 rpm, and the PCBM spin coating speed was fixed at 6000 rpm. Because the PCBM layer is thin, the separate TiO2 layer and the PCBM layer cannot be distinguished. This TiO2/PCBM bilayer is denoted as compact TiO2 in this image.</div>

International Journal of Photoenergy

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Figure 5

Figure 5: A PCBM-Modified TiO2 Blocking Layer towards Efficient Perovskite Solar Cells