Journal
SOLAR RRL
Volume 3, Issue 3, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.201800290
Keywords
2,2-trifluoroethylamine hydrochloride; 2dense fil; chloride incorporation; high stability; tin based perovskite solar cells
Funding
- National Natural Science Foundation of China (NSFC) [61775091 21671160]
- National Key Research Project MOST [2016YFA0202400]
- Shenzhen Key Laboratory Project [ZDSYS201602261933302]
- Natural Science Foundation of Shenzhen Innovation Committee [JCYJ20150529152146471, JCYJ20170818141216288]
- Defense Industrial Technology Development Program [JCKY2016208B012]
- Thousand Talents Program in Sichuan Province
- Longshan Talent Program of Southwest University of Science and Technology
- Seed Funding for Strategic Interdisciplinary Research Scheme of the University of Hong Kong
- RGC GRF grants [15204515, 15246816]
Ask authors/readers for more resources
The environmentally friendly additive 2,2,2-trifluoroethylamine hydrochloride (TFEACl) is used in synergy with SnF2 to enhance the efficiency and stability of FASnI(3)-based solar cells. Both TFEA(+) and Cl- are present in the films, but only Cl- is incorporated into the crystal lattice of the perovskite. The addition of TFEACl suppresses the segregation of SnF2, resulting in improvements in film morphology, in addition to a more favorable energy band alignment, and improved suppression of the formation of Sn4+. Consequently, reduced charge recombination and improved charge collection result in an efficiency enhancement from 3.63 to 5.30%. The stability of the devices is also significantly enhanced, with devices with TFEACl retaining over 60% of initial PCE after 350 h of light soaking in ambient, while devices without TFEACl experience failure in 120 h under the same testing condition.
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