Journal
ADVANCED MATERIALS
Volume 29, Issue 17, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201606806
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Funding
- China Scholarship Council
- EPSRC
- National Natural Science Foundation of China [21676188]
- Key Projects in Natural Science Foundation of Tianjin [16JCZDJC37100]
- Marie Curie Fellowship from the European Union's Seventh Framework Programme [291771]
- King Abdulaziz City for Science and Technology (KACST)
- Swiss National Science Foundation (SNSF) under the Scientific & Technological Cooperation Program Switzerland-Russia [IZLRZ2_164061]
- NRP 70 Energy Turnaround
- CCEM-CH
- European Union [687008]
- SNF-NanoTera
- Swiss Federal Office of Energy (SYNERGY)
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A fullerene derivative (alpha-bis-PCBM) is purified from an as-produced bis-phenyl-C-61-butyric acid methyl ester (bis-[60]PCBM) isomer mixture by preparative peak-recycling, high-performance liquid chromatography, and is employed as a templating agent for solution processing of metal halide perovskite films via an antisolvent method. The resulting alpha-bis-PCBM-containing perovskite solar cells achieve better stability, efficiency, and reproducibility when compared with analogous cells containing PCBM. alpha-bis-PCBM fills the vacancies and grain boundaries of the perovskite film, enhancing the crystallization of perovskites and addressing the issue of slow electron extraction. In addition, alpha-bis-PCBM resists the ingression of moisture and passivates voids or pinholes generated in the hole-transporting layer. As a result, a power conversion efficiency (PCE) of 20.8% is obtained, compared with 19.9% by PCBM, and is accompanied by excellent stability under heat and simulated sunlight. The PCE of unsealed devices dropped by less than 10% in ambient air (40% RH) after 44 d at 65 degrees C, and by 4% after 600 h under continuous full-sun illumination and maximum power point tracking, respectively.
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