Fig. 10From: WO3 Nanoparticles or Nanorods Incorporating Cs2CO3/PCBM Buffer Bilayer as Carriers Transporting Materials for Perovskite Solar Cells a J-V curves of devices without and with Cs2CO3/PCBM bilayer. b EQE spectrum and integrated current density of the best device B. c The histogram of the PCE values of 12 devices for devices A through EBack to article page