Ionic liquid thin layer-induced memory effects in organic field-effect transistors

2019 ◽  
Vol 21 (35) ◽  
pp. 18823-18829 ◽  
Author(s):  
Keitaro Eguchi ◽  
Michio M. Matsushita ◽  
Kunio Awaga
Keyword(s):  
Ionic Liquid ◽  
Thin Layer ◽  
Organic Semiconductors ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Memory Effects ◽  
Organic Field Effect Transistors ◽  
Organic Fets

Ionic liquid layers affect the morphology of organic semiconductors, grown on them, and induce memory effects in organic FETs.

scholarly journals Polarization-induced transport in ferroelelctric organic field-effect transistors

2019 ◽  
Author(s):  
◽  
Amrit Prasad Laudari
Keyword(s):  
Organic Semiconductors ◽  
Small Molecule ◽  
Dielectric Layer ◽  
Field Effect ◽  
Polyvinylidene Fluoride ◽  
Carrier Mobility ◽  
Field Effect Transistors ◽  
Organic Field Effect Transistors ◽  
Sensing Applications ◽  
Organic Fets

In this research we study the role of ferroelectric dielectrics in organic field-effect transistors (FETs) to understand the mechanism of charge transport in organic semiconductors. The ferroelectric nature of the polymer, poly(vinylidene fluoride) (PVDF)), has been known for over 45 years. However, its role in interfacial transport in organic/polymeric FETs is not that well understood. PVDF and its copolymer, polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE), as a dielectric in organic FETs is a perfect test-bed for conducting transport studies where a systematic tuning of the dielectric constant with temperature may be achieved. By choosing small molecule organic semiconductors -- pentacene and 6,13 bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) -- along with a copolymer PVDF-TrFE as the dielectric layer, the FET characteristics are monitored as a function of temperature. Pentacene FETs show a weak temperature dependence of the charge carrier mobility in the ferroelectric phase of PVDF-TrFE, which is attributed to polarization fluctuation driven transport resulting from a coupling of the charge carriers to the surface phonons of the dielectric layer. A negative coefficient of carrier mobility is observed in TIPS-pentacene upwards of 200 K with the ferroelectric dielectric, while an activated transport is observed with non-ferroelectric dielectrics. We show that this behavior is correlated with the nature of the trap states in TIPS-pentacene. We also developed the method of dipole engineering of the PVDF-TrFE films to enhance the properties of organic FETs. PVDF-TrFE, despite its applications in a vast range of work (including as a gate dielectric in organic FET and sensing applications) poses concerns such as higher conductivity compared to other polymer non-ferroelectric dielectrics. We have come up with new methods of electrical poling the dielectric layer to enhance FET performance as well as reduce gate leakage issues. We demonstrate the effect of polarization rotation in PVDF-TrFE on the performance of small-molecule-based organic FETs. The subthreshold swing and other transistor parameters in organic FETs can be controlled in a reversible fashion by switching the polarization direction in the PVDF-TrFE layer. We further demonstrate a novel method of selective poling of the dielectric layer. By using solution processed TIPS-pentacene as the organic semiconductor, it is shown that textured poling of the PVDF-TrFE layer dramatically improves FET properties compared to unpoled or uniformly poled ferroelectric films. The texturing is achieved by first vertically poling the PVDF-TrFE film and then laterally poling the dielectric layer close to the gate electrode. TIPS-pentacene FETs show on/off ratios of 105 and hole mobilities of 1 cm2/Vs under ambient conditions with operating voltages well below-4 V. This research opens prospects of achieving low-operating FETs without any expensive patterning techniques.

scholarly journals 2,2'-(Arylenedivinylene)bis-8-hydroxyquinolines exhibiting aromatic π-π stacking interactions as solution-processable p-type organic semiconductors for high-performance organic field effect transistors

2021 ◽  
Author(s):  
Suman Yadav ◽  
Shivani Sharma ◽  
Satinder K Sharma ◽  
Chullikkattil P. Pradeep
Keyword(s):  
Organic Semiconductors ◽  
Field Effect ◽  
High Performance ◽  
Field Effect Transistor ◽  
Field Effect Transistors ◽  
Organic Field Effect Transistors ◽  
Organic Thin Film ◽  
Effect Transistor ◽  
Solution Processable ◽  
P Type

Solution-processable organic semiconductors capable of functioning at low operating voltages (~5 V) are in demand for organic field-effect transistor (OFET) applications. Exploration of new classes of compounds as organic thin-film...

scholarly journals Ladder-type bithiophene imide-based organic semiconductors: understanding charge transport mechanisms in organic field effect transistors

2020 ◽  
Vol 8 (44) ◽  
pp. 15759-15770
Author(s):  
Alexandra Harbuzaru ◽  
Iratxe Arrechea-Marcos ◽  
Alberto D. Scaccabarozzi ◽  
Yingfeng Wang ◽  
Xugang Guo ◽  
...  
Keyword(s):  
Charge Transport ◽  
Chain Length ◽  
Organic Semiconductors ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Transport Mechanisms ◽  
Organic Field Effect Transistors

Different charge transport mechanisms at the device interface are found for a series of ladder-type semiconductors with increasing chain length.

scholarly journals Correction: Naphthalene flanked diketopyrrolopyrrole based organic semiconductors for high performance organic field effect transistors

2018 ◽  
Vol 42 (19) ◽  
pp. 16384-16384
Author(s):  
Qian Liu ◽  
Huabin Sun ◽  
Chula Blaikie ◽  
Chiara Caporale ◽  
Sergei Manzhos ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Field Effect ◽  
High Performance ◽  
Field Effect Transistors ◽  
Organic Field Effect Transistors

Correction for ‘Naphthalene flanked diketopyrrolopyrrole based organic semiconductors for high performance organic field effect transistors’ by Qian Liu et al., New J. Chem., 2018, 42, 12374–12385.

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