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

Figure 2

(a) Photovoltaic performance of perovskite solar cells prepared at different TiO₂ spin coating speed. (b) Photovoltaic performance of perovskite solar cells prepared at different PCBM spin coating speed (the TiO₂ spin coating speed was fixed at 4000 rpm). (c) The device performance fabricated by the static coating method and the dynamic coating method. The TiO₂ spin coating speed was fixed at 4000 rpm, and the PCBM spin coating speed was fixed at 6000 rpm.

(a)

(b)

(c)