Increased Static Charge–Induced Threshold Voltage Shifts and Memristor Activity in Pentacene OFETs Comprising Polystyrene–Based Gate Dielectrics Containing Electroactive Small Molecule Crystallites
Journal Article
·
· Advanced Functional Materials
- Department of Materials Science and Engineering Johns Hopkins University Baltimore MD 21218 USA; Johns Hopkins University
- Department of Physics and Astronomy Johns Hopkins University Baltimore MD 21218 USA
- Department of Materials Science and Engineering Johns Hopkins University Baltimore MD 21218 USA
Top-contact bottom-gate pentacene OFETs are fabricated with single layer dielectrics comprised of either polystyrene (PS), poly(4-methylstyrene) (P4MS), or poly(4-tert-butylstyrene) (P4TBS). The polystyrenes are blended with varying concentrations of two different small molecules, dibenzotetrathiafulvalene (DBTTF) and 2,8-difluoro-5,11-bis(triethylsilylethynyl)anthradithiophene (diF-TES-ADT), to form small, separated crystallites contained throughout the polymer dielectric layer. The OFET characteristics of these devices are investigated and their threshold voltage shifts are measured after –70 V static charging for 5 min. Two-terminal measurements are conducted using multiple different gate biases in the range of –50 to +50 V to investigate memristor behavior in the devices. OFETs containing DBTTF exhibited ΔVth increases as large as 330% relative to control OFETs containing no DBTTF, while OFETs containing at least 7.5 wt.% DBTTF exhibited memristor activity, with currents ranging from 20 nA to 44 µA depending on the applied bias. Furthermore, this work demonstrates that including small, separated crystallites in polymer dielectrics enhances their charge storage ability and can be promising for creating nonbinary memory devices for data processing. Additionally, the observed memristor activity indicates the OFETs in this work can be used in development of neuromorphic systems that aim to mimic the synaptic behavior of the human nervous system.
- Research Organization:
- Johns Hopkins University, Baltimore, MD (United States)
- Sponsoring Organization:
- Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- FG02-07ER46465
- OSTI ID:
- 2447090
- Journal Information:
- Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 52 Vol. 34; ISSN 1616-301X
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of organic electroactive crystallites in a dielectric matrix on the electrical properties of a polymer dielectric
Microstructural control of charge transport in organic blend thin-film transistors
Journal Article
·
Thu Jun 29 20:00:00 EDT 2023
· Physical Review Materials
·
OSTI ID:1987653
Microstructural control of charge transport in organic blend thin-film transistors
Journal Article
·
Wed Jul 16 20:00:00 EDT 2014
· Advanced Functional Materials
·
OSTI ID:1265395