Ultrafast Photogenerated Hole Extraction/Transport Behavior in a CH3NH3PbI3/Carbon Nanocomposite and Its Application in a Metal‐Electrode‐Free Solar Cell |
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| Authors: | Tao Ye Xi Jiang Dongyang Wan Xingzhi Wang Dr Jun Xing Prof Thirumalai Venkatesan Prof Qihua Xiong Prof Seeram Ramakrishna |
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| Affiliation: | 1. Department of Mechanical Engineering and Centre for Nanofibers and Nanotechnology, National University of Singapore, Singapore, Singapore;2. Division of Physics and Applied Physics, Nanyang Technological University, Singapore, Singapore;3. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, Singapore;4. Departments of Electrical and Computer Engineering, Physics, Materials, Engineering, NUSNNI-NanoCore, and Graduate School for Integrative, Sciences and Engineering, National University of Singapore, Singapore, Singapore |
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| Abstract: | Aligned and flexible electrospun carbon nanomaterials are used to synthesize carbon/perovskite nanocomposites. The free‐electron diffusion length in the CH3NH3PbI3 phase 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 CH3NH3PbI3 phase 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. |
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| Keywords: | carbon electrospinning nanostructures perovskite phases solar cells |
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