Journal
NANOMATERIALS
Volume 12, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/nano12030532
Keywords
functional fullerene; tin-based perovskite solar cells; electron-transporting; stability
Categories
Funding
- National Natural Science Foundation of China [51902110, 51802102, 21805101]
- Natural Science Foundation of Fujian Province [2020J01064, 2020J06021, 2019J01057]
- Scientific Research Funds of Huaqiao University [19BS105, 16BS201 and17BS409]
- Promotion Program for Young and Middle-Aged Teacher in Science and Technology Research of Huaqiao University [ZQN-806, ZQN-PY607]
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The functional group of fullerene derivatives plays a crucial role in the efficiency and stability of perovskite solar cells, and flexible alkyl chains can improve the efficiency and stability.
Fullerene derivatives are considered excellent materials for the extraction and transportation of electrons in the production of efficient tin-based perovskite solar cells (TPSCs). However, it is not clear how the molecular structure of fullerene derivatives affects the efficiency and stability of TPSCs. In this study, the effects of fullerene derivatives, (6,6)-phenyl-C-61-butyric acid hexyl ester (PCBH) and (6,6)-phenyl-C-61-butyric acid methyl ester (PCBM), with different functional groups, on photovoltaic performance were investigated. The flexible alkyl chain of PCBH effectively improved the film morphology and stability, the electron extraction and transport capabilities, and the interface contact of fullerene and perovskite. As a result, the PCBH-based TPSC yielded a higher efficiency, of 9.21%, than the PCBM-based devices (7.54%). More importantly, the PCBH-based films exhibited higher stability and effectively suppressed the oxidation of Sn2+ by inhibiting oxygen permeation. Therefore, the PCBH-based devices exhibited significantly enhanced stability. This result indicates that optimizing the functional group of fullerene derivatives is crucial for improving the efficiency and stability of TPSCs.
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