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Benzylammonium-Mediated Formamidinium Lead Iodide Perovskite Phase Stabilization for Photovoltaics |
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| Authors: | Anwar Q Alanazi Masaud H Almalki Aditya Mishra Dominik J Kubicki Zaiwei Wang Lena Merten Felix T Eickemeyer Hong Zhang Dan Ren Ahmed Y Alyamani Hamad Albrithen Abdulrahman Albadri Mohammad Hayal Alotaibi Alexander Hinderhofer Shaik M Zakeeruddin Frank Schreiber Anders Hagfeldt Lyndon Emsley Jovana V Mili? Michael Graetzel |
| Affiliation: | 1. Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, CH-1015 Switzerland;2. Laboratory of Magnetic Resonance, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, CH-1015 Switzerland;3. Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, CH-1015 Switzerland
Laboratory of Magnetic Resonance, Institute of Chemical Sciences and Engineering, School of Basic Sciences, Ecole Polytechnique Fédérale de Lausanne, Lausanne, CH-1015 Switzerland;4. Laboratory of Photomolecular Science, Institute of Chemical Sciences Engineering, Ecole Polytechnique Fedérale de Lausanne (EPFL), Lausanne, 1015 Switzerland;5. Institut für Angewandte Physik, Universität Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany;6. National Center for Nanotechnology, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh, 11442 Saudi Arabia;7. National Center for Nanotechnology, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh, 11442 Saudi Arabia Physics and Astronomy Department-Research Chair for Tribology, Surface and Interface Sciences, College of Science and King Abdullah Institute for Nanotechnology-Aramco Laboratory for Applied Sensing Research, King Saud University, P.O. Box 2455, Riyadh, 11451 Saudi Arabia K.A.CARE Energy Research and Innovation Center at Riyadh, Riyadh, 11451 Saudi Arabia |
| Abstract: | There is an ongoing surge of interest in the use of formamidinium (FA) lead iodide perovskites in photovoltaics due to their exceptional optoelectronic properties. However, thermodynamic instability of the desired cubic perovskite (α-FAPbI3) phase at ambient conditions leads to the formation of a yellow non-perovskite (δ-FAPbI3) phase that compromises its utility. A stable α-FAPbI3 perovskite phase is achieved by employing benzylammonium iodide (BzI) and the microscopic structure is elucidated by using solid-state NMR spectroscopy and X-ray scattering measurements. Perovskite solar cells based on the FAPbI3(BzI)0.25 composition achieve power conversion efficiencies exceeding 20%, which is accompanied by enhanced shelf-life and operational stability, maintaining 80% of the performance after one year at ambient conditions. |
| Keywords: | benzylammonium formamidinium lead iodide low-dimensional perovskites solid-state NMR |