Open AccessAll-optical THz wave switching based on CH3NH3PbI3 perovskites
Author(s) -
Kyusup Lee,
Rira Kang,
Byungwoo Son,
DongYu Kim,
Nan Yu,
DoKyeong Ko
Publication year - 2016
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep37912
Subject(s) - terahertz radiation , perovskite (structure) , optoelectronics , materials science , laser , photovoltaics , silicon , optics , photovoltaic system , chemistry , physics , electrical engineering , crystallography , engineering
Hybrid structures of silicon with organic–inorganic perovskites are proposed for optically controllable switching of terahertz (THz) waves over a broad spectral range from 0.2 to 2THz. A 532-nm external laser was utilized to generate photoexcited free carriers at the devices and consequentially to control the terahertz amplitude modulation, obtaining a depth of up to 68% at a laser irradiance of 1.5 W/cm 2 . In addition, we compared the performances from three types of perovskite devices fabricated via different solution processing methods and suggested a stable and highly efficient THz switch based on a one-step processing. By this we demonstrated the possibility of perovskites as THz wave switching devices in addition to photovoltaics.