Multiband Photoresponding Field-Effect Transistor Memory Using Conjugated Block Copolymers with Pendent Isoindigo Coils as a Polymer Electret
Journal
Advanced Electronic Materials
Journal Volume
7
Journal Issue
12
Date Issued
2021
Author(s)
Abstract
In this study, the authors report a series of conjugated block copolymers, PF-b-Piso comprising poly[2,7-(9,9-dihexylfluorene)] (PF), and poly(pendent isoindigo) (Piso) for polymer electret in the photonic field-effect transistor (FET) memory device. The optical properties, surface morphology, and molecular organization of these BCPs are investigated systematically. Accordingly, Piso with absorption in the Ultraviolet C range (UVC, 200–280 nm) possibly rendered the device with a multiband photoresponse, and a good memory performance is achieved by optimizing the polymer composition. Therefore, the memory device comprising PF-b-Piso could perform a high current contrast of 106 to 405 nm light and 105 to 254 nm light over 104 s. In addition, a current contrast of 104 and 102 is achieved in response to 650 and 530 nm light, and this phenomenon can be attributed to the charge transfer between channel and memory layers. The experimental results indicate that the block copolymer design not only conduces to forming a self-assembled microphase separation to stabilize the trapped charge in the polymer electret, but also triggers multiband photoresponding of the photonic FET memory. ? 2021 Wiley-VCH GmbH
Subjects
conjugated block copolymer
photomemory
photoprogramming
polyfluorene
polymer electret
Block copolymers
Conjugated polymers
Electrets
Field effect transistors
Microphase separation
Morphology
Optical properties
Surface morphology
Conjugated block copolymers
Field-effect transistor
Isoindigo
Molecular organization
Multi band
Photomemory
Photonic fields
Photoprogramming
Polyfluorenes
Polymer electret
Charge transfer
Type
journal article