Black phosphorus doped Poly(triarylamine) as hole transport layer for highly efficient perovskite solar cells |
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| Affiliation: | 1. Centre for Hybrid and Organic Solar Energy (CHOSE), University of Rome “Tor Vergata”, via del Politecnico 1, Rome 00133, Italy;2. Kimia Solar Research Institute (K.S.R.I), Kimia Solar Company, Kashan 87137-45868, Iran;3. Institute for Materials Discovery, University College London, Torrington Place, London WC1E 7JE, United Kingdom;4. Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom;5. Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany;6. Chemical Engineering Department, University of Kashan, Kashan, Iran;7. Cavendish Laboratory, Department of Physics, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom;8. Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, United Kingdom;9. CNR-ISM Istituto di Struttura della Materia, via Fosso del Cavaliere 100, 00133 Rome, Italy;10. LASE-Laboratory for Advanced Solar Energy, NUST-MISIS, Leninskiy Prospect 4, 119049 Moscow, Russia |
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| Abstract: | Charge transport layer plays a critical role in high-performance perovskite solar cells (PSCs). Herein, few-layered 2D black phosphorus (BP) nanosheet doped poly(triarylamine) (PTAA) is employed as hole transport layer for PSCs. The BP:PTAA significantly improves charge extraction at perovskite/BP:PTAA interface together with the smaller energy barrier, the increased conductivity of the PTAA film, and the formation of the high-quality perovskite film with enlarged crystal gain size, which suppress the interfacial charge recombination and trap-assisted recombination. As a result, the champion device using BP:PTAA produces the higher power conversion efficiency of 20.49% than the control device of 18.26%. Moreover, the remarkable improvement in device stability has been demonstrated attributed to the more hydrophobicity of BP:PTAA and the perovskite layer with less defect states. This work provides an effective hole transport layer for PSCs, which is comparable with the commonly used 2,3,5,6-Tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ):PTAA. |
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| Keywords: | Black phosphorus Hole transport layer Interface Recombination Perovskite solar cell |
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