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.
[*] Dr. G. Li,+ Prof. Dr. M. Li, Y. Tang, Z. Zhang
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)
E-mail: mengli@henu.edu.cn
Dr. G. Li,+ Prof. Dr. M. Li, Dr. A. Musiienko, F. Akhundova, J. Li,
K. Prashanthan, Dr. F. Yang, S. Trofimov, S. Zuo, L. Wu, L. Wang,
Dr. Y. Yang, Dr. B. Agyei-Tuffour, Dr. R. W. MacQueen,
Dr. B. Naydenov, Dr. T. Unold, Prof. Dr. E. Unger, Prof. Dr. A. Abate
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
Hahn-Meitner-Platz 1, 14109 Berlin (Germany)
E-mail: antonio.abate@helmholtz-berlin.de
Dr. G. Li,+ Prof. Dr. A. Abate
Department of Chemistry, Bielefeld University
Universitätsstraße 25, 33615 Bielefeld (Germany)
Dr. G. Li+
Present address: Institute of Chemical Sciences and Engineering,
École Polytechnique Fédérale de Lausanne (EPFL)
1015 Lausanne (Switzerland)
Dr. Y. Hu,+ Q. Cao, Prof. Dr. S. Eigler
Institute of Chemistry and Biochemistry, Freie Universität Berlin
Altensteinstraße 23a, 14195 Berlin (Germany)
E-mail: siegfried.eigler@fu-berlin.de
Dr. Y. Hu+
CNRS, Immunology, Immunopathology and Therapeutic Chemistry,
UPR3572, University of Strasbourg, ISIS
67000 Strasbourg (France)
K. Prashanthan
Department of Physics, University of Jaffn
