Two-Dimensional Cs 2 Pb(SCN) 2 Br 2 -Based Photomemory Devices Showing a Photoinduced Recovery Behavior and an Unusual Fully Optically Driven Memory Behavior
Journal
ACS Applied Materials and Interfaces
Journal Volume
12
Journal Issue
32
Pages
36398-36408
Date Issued
2020
Author(s)
Abstract
The rapid development of Internet of Things and big data has made the conventional storage devices face the need of reforming. Rather than using electrical pulses to store data in one of two states, photomemory exploiting optical stimulation to store light information emerges as a revolutionary candidate for the optoelectronic community. However, fully optically driven photomemory with fast data transmission speed and outstanding energy saving capability suffers from less exploration. Herein, a transistor-type photomemory using a 2D Cs2Pb(SCN)2Br2/polymer hybrid floating gate is explored and three host polymers, polystyrene, poly(4-vinylphenol), and poly(vinylpyrrolidone) (PVP), are investigated to understand the relationship between polymer matrix selection and memory performance. All devices show a photoinduced recovery memory behavior but with two distinctly different photomemory behaviors. In addition to the demonstration of a regular nonvolatile photomemory showing a high on/off ratio of >106 over 104 s, an unusual fully optically driven memory behavior is intriguingly accomplished in the Cs2Pb(SCN)2Br2/PVP photomemory. Using white light as the driver of programming and a blue laser as the main performer of erasing, this device can be switched between two distinguishable states and possesses acceptable data discriminability, as evidenced by its fully optically driven writing (programing)-reading-erasing-reading switching function that shows an on/off current ratio of 103. This study not only presents the first 2D perovskite-based photomemory but also shows a novel fully optically driven memory that has been rarely reported in the literature. Copyright © 2020 American Chemical Society.
Subjects
2D perovskite; floating gate; fully optically driven photomemory; perovskite/polymer hybrid; photoinduced recovery; transistor memory
SDGs
Other Subjects
Perovskite; Virtual storage; Fast data transmission; Matrix selection; Memory performance; ON/OFF current ratio; Optical stimulation; Optoelectronic community; Poly(4-vinylphenol); Polyvinyl pyrrolidone; Energy conservation
Type
journal article