期刊
CHEMICAL SCIENCE
卷 6, 期 7, 页码 4054-4059出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5sc01135c
关键词
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资金
- National Science Foundation CAREER award [DMR-1351538]
- Global Climate and Energy Project (GCEP)
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1351538] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1542152] Funding Source: National Science Foundation
Reaction with halogen vapor allows us to post-synthetically exchange halides in both three- (3D) and two-dimensional (2D) organic-inorganic metal-halide perovskites. Films of 3D Pb-I perovskites cleanly convert to films of Pb-Br or Pb-Cl perovskites upon exposure to Br-2 or Cl-2 gas, respectively. This gas-solid reaction provides a simple method to produce the high-quality Pb-Br or Pb-Cl perovskite films required for optoelectronic applications. Reactivity with halogens can be extended to the organic layers in 2D metal-halide perovskites. Here, terminal alkene groups placed between the inorganic layers can capture Br-2 gas through chemisorption to form dibromoalkanes. This reaction's selectivity for Br-2 over I-2 allows us to scrub Br-2 to obtain high-purity I-2 gas streams. We also observe unusual halogen transfer between the inorganic and organic layers within a single perovskite structure. Remarkably, the perovskite's crystallinity is retained during these massive structural rearrangements.
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