Enhanced Charge Transport in 2D Perovskites via Fluorination of Organic Cation
March 18, 2019
Through fluorine substitution on the para position in phenethylammonium (PEA) to form 4-fluorophenethylammonium (F-PEA), the average phenyl ring centroid−centroid distances in the organic layer become shorter with better aligned stacking of perovskite sheets.
We enhanced out-of-plane transport in 2D perovskites via simple molecular modification of the organic spacer. Specifically, fluorine substitution on the para position in PEA to form F-PEA strengthens inter-plane coupling with faster out-of-plane transport.
Significance and Impact
2D perovskite is promising with good stability, but out-of-plane transport is limited by the bulky organic cation spacer. Our work shows a general molecular engineering approach to tune the electronic coupling between 2D sheets to improve carrier transport.
- Solution processing to prepare 2D perovskite thin films based on PEA
- Fluorine substitution on the para position in PEA to form F-PE)
- Detailed spectroscopic and electrical measurements to understand carrier transport and defect properties