title: WO3Nanoparticles or Nanorods Incorporating Cs2CO3/PCBM Buffer Bilayer as Carriers Transporting Materials for Perovskite Solar Cells.
abstract: In this work, we demonstrate a novel carrier transporting combination made of tungsten trioxide (WO3) nanomaterials and Cs2CO3/PCBM buffer bilayer for the fabrication of perovskite solar cells (PSCs). Two different types of WO3, including nanoparticles and nanorods, were prepared by sol-gel process and hydrothermal method, respectively. Cs2CO3/PCBM buffer bilayer was inserted between WO3and perovskite layers to improve charge transfer efficiency and formation of pinhole-free perovskite layer. Besides, the leakage current of the devices containing Cs2CO3/PCBM buffer bilayer was significantly suppressed. The optimized device based on WO3nanoparticles and Cs2CO3/PCBM bilayer showed an open-circuit voltage of 0.84 V, a short-circuit current density of 20.40 mA/cm2, a fill factor of 0.61, and a power conversion efficiency of 10.49 %, which were significantly higher than those of PSCs without Cs2CO3/PCBM buffer bilayer. The results revealed that the combination of WO3nanomaterials and Cs2CO3/PCBM bilayer provides an effective solution for improving performances of PSCs.
authors.affiliation: Institute of Lighting and Energy Photonics, National Chiao Tung University, No. 301, Gaofa 3rd Road, Guiren District, Tainan, 71150, Taiwan, ROC.
authors.forename: Chih-Ming
authors.initials: CM
authors.lastname: Chen
authors.affiliation: Institute of Lighting and Energy Photonics, National Chiao Tung University, No. 301, Gaofa 3rd Road, Guiren District, Tainan, 71150, Taiwan, ROC.
authors.forename: Zheng-Kun
authors.initials: ZK
authors.lastname: Lin
authors.affiliation: Institute of Lighting and Energy Photonics, National Chiao Tung University, No. 301, Gaofa 3rd Road, Guiren District, Tainan, 71150, Taiwan, ROC.
authors.forename: Wei-Jie
authors.initials: WJ
authors.lastname: Huang
authors.affiliation: Institute of Lighting and Energy Photonics, National Chiao Tung University, No. 301, Gaofa 3rd Road, Guiren District, Tainan, 71150, Taiwan, ROC. yangsh@mail.nctu.edu.tw.
authors.forename: Sheng-Hsiung
authors.initials: SH
authors.lastname: Yang
keywords: Buffer bilayer; Hydrothermal; Perovskite solar cells; Tungsten trioxide