Journal
ADVANCED MATERIALS
Volume 32, Issue 36, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202002784
Keywords
2D perovskites; crystallization kinetics; in situ GIWAXS; sandwich-type structures
Categories
Funding
- Young 1000 Talent Program of China
- National Natural Science Foundation of China (NSFC) [51973110, 21734009, 21905102, 61805138]
- DOE, Office of Science
- DOE, Office of Basic Energy Sciences
- US Office of Naval Research [N00014-17-1-2241]
Ask authors/readers for more resources
2D perovskite solar cells with high stability and high efficiency have attracted significant attention. A systematical static and dynamic structure investigation is carried out to show the details of 2D morphology evolution. A dual additive approach is used, where the synergy between an alkali metal cation and a polar solvent leads to high-quality 2D perovskite films with sandwich-type structures and vertical phase segregation. Such novel structure can induce high-quality 2D slab growth and reduce internal and surface defects, resulting in a high device efficiency of 16.48% with enhanced continuous illumination stability and improved moisture (55-60%) and thermal (85 degrees C) tolerances. Transient absorption spectra reveal the carrier migration from lownto highnspecies with different kinetics. An [PbI6](4-)octagon coalescence transformation mechanism coupled with metal and organic cations wrapped is proposed. By solvent vapor annealing, a recrystallization and reorientation of the 2D perovskite slabs occurs to form an ideal structure with improved device performance and stability.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available