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Managing Excess Lead Iodide with Functionalized Oxo-Graphene Nanosheets for Stable Perovskite Solar Cells |
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| Authors: | Dr Guixiang Li Dr Yalei Hu Prof Dr Meng Li Ying Tang Zuhong Zhang Dr Artem Musiienko Qing Cao Fatima Akhundova Jinzhao Li Karunanantharajah Prashanthan Dr Fengjiu Yang Patryk Janasik Augustine N S Appiah Sergei Trofimov Nikolaos Livakas Shengnan Zuo Luyan Wu Luyao Wang Dr Yuqian Yang Dr Benjamin Agyei-Tuffour Dr Rowan W MacQueen Dr Boris Naydenov Dr Thomas Unold Prof Dr Eva Unger Dr Ece Aktas Prof Dr Siegfried Eigler Prof Dr Antonio Abate |
| Institution: | 1. Key Lab for Special Functional Materials of Ministry of Education, National & Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology, School of Materials Science and Engineering, Collaborative Innovation Center of Nano Functional Materials and Applications, Henan University, Kaifeng, 475004 China;2. Institute of Chemistry and Biochemistry, Freie Universität Berlin, Altensteinstraße 23a, 14195 Berlin, Germany;3. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany;4. Silesian University of Technology, 44-100 Gliwice, Poland;5. Nanochemistry Department, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy
Department of Chemistry and Industrial Chemistry, Universitàdegli Studi di Genova, Via Dodecaneso 31, 16146 Genova, Italy;6. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany Department of Physics, Università di Cagliari Cittadella Universitaria, 09042 Monserrato, Italy;7. Department of Chemical, Materials and Production Engineering, University of Naples Federico II. Naples, pzz.le Vincenzo Tecchio 80, 80125 Naples, Italy |
| Abstract: | Stability issues could prevent lead halide perovskite solar cells (PSCs) from commercialization despite it having a comparable power conversion efficiency (PCE) to silicon solar cells. Overcoming drawbacks affecting their long-term stability is gaining incremental importance. Excess lead iodide (PbI2) causes perovskite degradation, although it aids in crystal growth and defect passivation. Herein, we synthesized functionalized oxo-graphene nanosheets (Dec-oxoG NSs) to effectively manage the excess PbI2. Dec-oxoG NSs provide anchoring sites to bind the excess PbI2 and passivate perovskite grain boundaries, thereby reducing charge recombination loss and significantly boosting the extraction of free electrons. The inclusion of Dec-oxoG NSs leads to a PCE of 23.7 % in inverted (p-i-n) PSCs. The devices retain 93.8 % of their initial efficiency after 1,000 hours of tracking at maximum power points under continuous one-sun illumination and exhibit high stability under thermal and ambient conditions. |
| Keywords: | Excess Lead Iodide Operational Stability Oxo-Graphene Nanosheets Perovskite Photovoltaics Solar Cells |