Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 120, Issue 40, Pages 23299-23303Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b09515
Keywords
-
Funding
- National Natural Science Foundation of China [61574078, U1531107]
- Fundamental Research Funds for the Central Universities [30915011202, 30916014112-002]
- Natural Science Foundation of Jiangsu Province [BK20140799]
Ask authors/readers for more resources
The photoluminescence from exciplex states at lower energy than the bandgap of CH3NH3PbI3 (MAPbI(3)) was observed in both MAPbI(3)/Spiro-OMeTAD and MAPbI(3)/PCBM bilayer films. At the same time, using continuous wave photoinduced absorption (PIA) spectroscopy, we observed the PIA band at 0.14 eV, which was due to the positive or negative polarons in perovskite for MAPbI(3)/Spiro-OMeTAD and MAPbI(3)/PCBM film, respectively. The binding energies of both kinds of polarons are about similar to 40 meV, with the radius of phonon cloud of about 5.9 nm. Our finding may supply direct spectroscopic evidence for the existence of exciplex states in heterojunction of hybrid halide perovskite and charge transport materials as well as consequent large polarons in perovskite.
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