期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 39, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202205870
关键词
defect passivation; energy level alignments; energy losses; high efficiencies; pyridine-functionalized fullerenes; tin perovskites
类别
资金
- City University of Hong Kong [9610421]
- Innovation and Technology Fund [ITS/095/20, GHP/100/20SZ, GHP/102/20GD]
- Research Grants Council of Hong Kong [21301319, 11306521]
- Guangdong Provincial Science and Technology Plan [2021A0505110003]
- Natural Science Foundation of Guangdong Province [2019A1515010761]
- Science Technology and Innovation Committee of Shenzhen Municipality [SGDX20210823104002015]
- Lee Shau Kee Chair Professorship
A multifunctional interface manipulation strategy is developed to improve the performance and stability of tin perovskite solar cells (PSCs) by introducing a pyridine-functionalized fullerene derivative. The resulting devices achieve the highest power conversion efficiency (PCE) of 14.14% and maintain over 95% of their initial PCE after continuous one-sun illumination for 1000 hours.
In tin perovskite solar cells (PSCs), fullerene (C-60) and fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) are commonly utilized electron transport materials. However, the energetic disorder, inadequate passivation, and energy level mismatch of C-60 and PCBM limit the improvement of power conversion efficiency (PCE) and lifespan of tin PSCs. In this work, a multifunctional interface manipulation strategy is developed by introducing a pyridine-functionalized fullerene derivative, fullerene-n-butyl-pyridine (C-60-BPy), into the interface between the tin perovskite and the electron transport layer (ETL) to improve the photovoltaic performance and stability of tin PSCs. The C-60-BPy can strongly anchor on the perovskite surface via coordination interactions between the pyridine moiety and the Sn2+ ion, which not only reinforces the passivation of the trap-state within the tin perovskite film, but also regulates the interface energy level alignment to reduce non-radiative recombination. Moreover, the improved interface binding and carrier transport properties of C-60-BPy contribute to superior device stability. The resulting devices have achieved the highest PCE of 14.14% with negligible hysteresis, and are maintained over 95% of their initial PCE under continuous one-sun illumination for 1000 h.
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