title: Ultrafast Photogenerated Hole Extraction/Transport Behavior in a CH3NH3PbI3/Carbon Nanocomposite and Its Application in a Metal-Electrode-Free Solar Cell.
abstract: Aligned and flexible electrospun carbon nanomaterials are used to synthesize carbon/perovskite nanocomposites. The free-electron diffusion length in the CH3NH3PbI3phase of the CH3NH3PbI3/carbon nanocomposite is almost twice that of bare CH3NH3PbI3, and nearly 95 % of the photogenerated free holes can be injected from the CH3NH3PbI3phase into the carbon nanomaterial. The exciton binding energy of the composite is estimated to be 23 meV by utilizing temperature-dependent optical absorption spectroscopy. The calculated free carriers increase with increasing total photoexcitation density, and this broadens the potential of this material for a broad range of optoelectronics applications. A metal-electrode-free perovskite solar cell (power conversion efficiency: 13.0 %) is fabricated with this perovskite/carbon composite, which shows great potential for the fabrication of efficient, large-scale, low-cost, and metal-electrode-free perovskite solar cells.
authors: Department of Mechanical Engineering and Centre for Nanofibers and Nanotechnology, National University of Singapore, Singapore, 117576, Singapore.|Division of Physics and Applied Physics, Nanyang Technological University, Singapore, 637371, Singapore.
authors: Tao
authors: T
authors: Ye
authors: Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117585, Singapore.
authors: Xi
authors: X
authors: Jiang
authors: Departments of Electrical and Computer Engineering, Physics, Materials, Engineering, NUSNNI-NanoCore, and Graduate School for Integrative, Sciences and Engineering, National University of Singapore, Singapore, 117576, Singapore.
authors: Dongyang
authors: D
authors: Wan
authors: Division of Physics and Applied Physics, Nanyang Technological University, Singapore, 637371, Singapore.
authors: Xingzhi
authors: X
authors: Wang
authors: Division of Physics and Applied Physics, Nanyang Technological University, Singapore, 637371, Singapore.
authors: Jun
authors: J
authors: Xing
authors: Departments of Electrical and Computer Engineering, Physics, Materials, Engineering, NUSNNI-NanoCore, and Graduate School for Integrative, Sciences and Engineering, National University of Singapore, Singapore, 117576, Singapore.
authors: Thirumalai
authors: T
authors: Venkatesan
authors: Division of Physics and Applied Physics, Nanyang Technological University, Singapore, 637371, Singapore.
authors: Qihua
authors: Q
authors: Xiong
authors: Department of Mechanical Engineering and Centre for Nanofibers and Nanotechnology, National University of Singapore, Singapore, 117576, Singapore.
authors: Seeram
authors: S
authors: Ramakrishna
keywords: carbon; electrospinning; nanostructures; perovskite phases; solar cells