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Curing the fundamental issue of impurity phases in two-step solution-processed CsPbBr3 perovskite films.
- Source :
-
Science Bulletin . May2020, Vol. 65 Issue 9, p726-737. 12p. - Publication Year :
- 2020
-
Abstract
- Inorganic lead halide perovskite CsPbBr 3 offers attractive photophysical properties and phase stability for high-performance optoelectronic devices. However, CsPbBr 3 films produced by the classic solution-based two-step method are always accompanied with impurity phases of CsPb 2 Br 5 and Cs 4 PbBr 6 , which represents a major efficiency-limiting factor for future advances of CsPbBr 3 -based devices. The challenge lies in the complexity of the Cs-Pb-Br phase system, requiring both spatially and temporally precise control of the precursor stoichiometry during solution-phase growth of CsPbBr 3 films. By adopting 2-methoxyethanol as the solution conversion medium instead of commonly applied methanol, the reaction between CsBr and PbBr 2 can be finely controlled to yield single phase CsPbBr 3 films within a few minutes; extending the solution-conversion step to 24 h does not alter the phase purity of resulting CsPbBr 3 films. The present work paves the way to regulate the crystal growth behaviors of two-step solution-processed CsPbBr 3 films by simple solvent engineering. [ABSTRACT FROM AUTHOR]
- Subjects :
- *METHYLAMMONIUM
*OPTOELECTRONIC devices
*LEAD halides
*CRYSTAL growth
*STOICHIOMETRY
Subjects
Details
- Language :
- English
- ISSN :
- 20959273
- Volume :
- 65
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Science Bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 142719662
- Full Text :
- https://doi.org/10.1016/j.scib.2020.01.025