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In this work, we demonstrate a novel carrier transporting combination made of tungsten trioxide (WO 3 ) nanomaterials and Cs 2 CO 3 /PCBM buffer bilayer for the fabrication of perovskite solar cells (PSCs). Two different types of WO 3 , including nanoparticles and nanorods, were prepared by sol-gel process and hydrothermal method, respectively. Cs 2 CO 3 /PCBM buffer bilayer was inserted between WO 3  and perovskite layers to improve charge transfer efficiency and formation of pinhole-free perovskite layer. Besides, the leakage current of the devices containing Cs 2 CO 3 /PCBM buffer bilayer was significantly suppressed. The optimized device based on WO 3  nanoparticles and Cs 2 CO 3 /PCBM bilayer showed an open-circuit voltage of 0.84 V, a short-circuit current density of 20.40 mA/cm 2 , a fill factor of 0.61, and a power conversion efficiency of 10.49 %, which were significantly higher than those of PSCs without Cs 2 CO 3 /PCBM buffer bilayer. The results revealed that the combination of WO 3  nanomaterials and Cs 2 CO 3 /PCBM bilayer provides an effective solution for improving performances of PSCs.

WO3 Nanoparticles or Nanorods Incorporating Cs2CO3/PCBM Buffer Bilayer as Carriers Transporting Materials for Perovskite Solar Cells