Journal
ADVANCED OPTICAL MATERIALS
Volume 6, Issue 1, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.201700615
Keywords
crystal nucleation; lead free; perovskite solar cells; tin-fluoride
Categories
Funding
- National Key Research and Development Program of China [2017YFA0205700]
- State Key Program for Basic Research of China [2015CB659300]
- National Natural Science Foundation of China [11621091, 11574143]
- Natural Science Foundation of Jiangsu Province [BK20150056]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Fundamental Research Funds for the Central Universities [021314380068, 021314380089, 021314380091]
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Tin fluoride (SnF2) is widely used as an effective additive for lead-free tin-based perovskite solar cells. However, the function of SnF2 and the mechanism in improving the film morphology are still not clear. In this work, it is clearly demonstrated that SnF2 can play a crucial role in the crystal nucleation process. Due to the limited solubility, SnF2 creates more nucleuses for the crystal growth and therefore enables more uniform thin film with high coverage. It is confirmed that this mechanism can be applied to the growth of both thin film and single crystal. As a result of tin-fluoride-assisted heterogeneous nucleation, an MASnIBr(2)-based perovskite solar cell with a high and stable power conversion efficiency of 3.70% is demonstrated.
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