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

Figure 1

(a) The device structure of the planar heterojunction perovskite solar cell. (b) The corresponding energy level diagram. The energy levels of FTO, TiO₂, PCBM, perovskite, and spiro-MeOTAD were referenced from the previous report [22, 23].

(a)

(b)