Journal
ADVANCED MATERIALS
Volume 30, Issue 31, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201707583
Keywords
cation-pi interaction; calculations; efficient and stable perovskite solar cells; ion migration inhibition; perovskite materials
Categories
Funding
- National Natural Science Foundation of China [51772096, 51372082, 51402106, 11504107]
- Beijing Natural Science Foundation [17L20075]
- Joint Funds of the Equipment Pre-Research and Ministry of Education [6141A020225]
- National Key R&D Program of China [2016YFB0401003]
- National High-tech R&D Program of China (863 Program) [2015AA034601]
- Par-Eu Scholars Program, Beijing Municipal Science and Technology Project [Z161100002616039]
- Fundamental Research Funds for the Central Universities [2016JQ01, 2017ZZD02]
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Migration of ions can lead to photoinduced phase separation, degradation, and current-voltage hysteresis in perovskite solar cells (PSCs), and has become a serious drawback for the organic-inorganic hybrid perovskite materials (OIPs). Here, the inhibition of ion migration is realized by the supramolecular cation-pi interaction between aromatic rubrene and organic cations in OIPs. The energy of the cation-pi interaction between rubrene and perovskite is found to be as strong as 1.5 eV, which is enough to immobilize the organic cations in OIPs; this will thus will lead to the obvious reduction of defects in perovskite films and outstanding stability in devices. By employing the cation-immobilized OIPs to fabricate perovskite solar cells (PSCs), a champion efficiency of 20.86% and certified efficiency of 20.80% with negligible hysteresis are acquired. In addition, the long-term stability of cation-immobilized PSCs is improved definitely (98% of the initial efficiency after 720 h operation), which is assigned to the inhibition of ionic diffusions in cation-immobilized OIPs. This cation-pi interaction between cations and the supramolecular pi system enhances the stability and the performance of PSCs efficiently and would be a potential universal approach to get the more stable perovskite devices.
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