An in situ rewritable electrically-erasable photo-memory device for terahertz waves

Luyao Xiong; Bin Liu; Dandan Liu; Longfeng Lv; Yanbing Hou; Jingling Shen; Bo Zhang

doi:10.1039/c9nr08826a

An in situ rewritable electrically-erasable photo-memory device for terahertz waves

Nanoscale. 2020 Feb 7;12(5):3343-3350. doi: 10.1039/c9nr08826a. Epub 2020 Jan 27.

Authors

Luyao Xiong¹, Bin Liu¹, Dandan Liu¹, Longfeng Lv², Yanbing Hou³, Jingling Shen¹, Bo Zhang¹

Affiliations

¹ Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing Advanced Innovation Center for Imaging Theory and Technology, Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Beijing Key Laboratory of Metamaterials and Devices, Department of Physics, Capital Normal University, Beijing, 100048 China. bzhang@cnu.edu.cn sjl-phy@cnu.edu.cn.
² Institution of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China.
³ Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing, 100044, China.

PMID: 31984404
DOI: 10.1039/c9nr08826a

Abstract

A terahertz read-only in situ electrically-erasable rewritable photo-memory device based on a perovskite:Ag (perovskite with Ag nanoparticles added)/SnO₂/PEDOT:PSS hetero-junction structure is reported. Under low optical excitation, considerable terahertz amplitude modulation in a perovskite:Ag/PEDOT:PSS hybrid structure was achieved. When a SnO₂ nanoparticle film was inserted between the perovskite and PEDOT:PSS layer, the attenuation of the terahertz signal was weaker than that of the perovskite:Ag/PEDOT:PSS hybrid structure; however, the SnO₂ nanoparticle film considerably prolonged the recovery time of the modulated terahertz wave in air after photo-excitation was stopped. In addition, when bias voltages were applied to the perovskite:Ag/PEDOT:PSS and perovskite:Ag/SnO₂/PEDOT:PSS hybrid structures, respectively, the terahertz signals recovered rapidly for both structures. Consequently, the photo-memory functionality was achieved based on a perovskite:Ag/SnO₂/PEDOT:PSS hybrid structure with an in situ method for erasing stored information.