Open AccessTime-resolved measurement of photocarrier generation in CH3NH3PbI3 single crystals
Author(s) -
Yuji Tanaka,
Ikuko Akimoto
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1220/1/012019
Subject(s) - nanosecond , excitation , exciton , materials science , microwave , photoconductivity , absorption (acoustics) , absorption edge , laser , resolution (logic) , enhanced data rates for gsm evolution , absorption spectroscopy , optics , atomic physics , molecular physics , optoelectronics , analytical chemistry (journal) , chemistry , condensed matter physics , band gap , physics , telecommunications , artificial intelligence , computer science , composite material , chromatography , quantum mechanics
A giant microwave response is transiently observed in CH 3 NH 3 PbI 3 single crystals under pulsed laser excitation at temperatures in both structural phases across the transition at 161 K. The response is caused by photocarriers generated in the specimen mounted in a microwave cavity. This detection technique is capable of measuring the carrier dynamics with a time-resolution of a few nanoseconds. Based on the time-resolved excitation spectrum near the absorption edge, we unveil that the photocarriers are generated by long-lived excitons as well as by fast band-to-band transition.