|
Type |
Oral Presentation |
Area |
Oral Presentation for Young Scholars in Physical Chemistry |
Room No. |
Room 402 |
Time |
THU 10:12-: |
Code |
PHYS.O-7 |
Subject |
Methylammonium Lead Iodide Photochemistry probed by Raman microscopy and fs pump-probe spectroscopy |
Authors |
Myeongkee Park Department of Chemistry, Dong-A University, Korea |
Abstract |
There has been tremendous interest in how methylammonium lead iodide (MAPbI3) perovskite achieves high photovoltaic efficiency as a future promising solar cell. Many of studies, particularly, have been tried to understand flexible MA ion’s roles in the inorganic Pb-I framework, e.g. MA-induced polaron-screening and transient Rashba splitting effects. Recently, we have experimentally found mechanistic findings for MA’s role by employing Raman & photoluminescence microscopy, femtosecond time-resolved spectroscopy, and first-principles density functional theory. Our results suggest that (1) MA’s dipole orientational changes induce distortions of the Pb-I framework via hydrogen-bonding strength changes between the hydrogen of MA and the iodine atom and (2) excited-state coherent phonon modes of the Pb-I framework are correlated with distorted structures indicating the isolated polaron formation. |
E-mail |
femtoguy@gmail.com |
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