Synthesis and Characterization of Fluorenone-Based Donor-Acceptor Small Molecule Organic Semiconductors for Organic Field-Effect Transistors

2020 ◽  
Vol 28 (7) ◽  
pp. 654-659
Author(s):  
Jeongyeon Lee ◽  
Chaeyoung Yun ◽  
M. Rajeshkumar Reddy ◽  
Dongil Ho ◽  
Choongik Kim ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Small Molecule ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Synthesis And Characterization ◽  
Organic Field Effect Transistors ◽  
Donor Acceptor

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.

Synthesis and characterization of soluble indolo[3,2-b]carbazole derivatives for organic field-effect transistors

2010 ◽  
Vol 11 (10) ◽  
pp. 1649-1659 ◽  
Author(s):  
Pierre-Luc T. Boudreault ◽  
Ajay A. Virkar ◽  
Zhenan Bao ◽  
Mario Leclerc
Keyword(s):  
Field Effect ◽  
Field Effect Transistors ◽  
Synthesis And Characterization ◽  
Organic Field Effect Transistors ◽  
Carbazole Derivatives

Acceptor–donor–acceptor molecule processed using polar non-halogenated solvents for organic field-effect transistors

2020 ◽  
Vol 8 (19) ◽  
pp. 6496-6502
Author(s):  
Guobing Zhang ◽  
Wei Zhou ◽  
Minkyu Kim ◽  
Mingxiang Sun ◽  
Hongbo Lu ◽  
...  
Keyword(s):  
Small Molecule ◽  
Field Effect ◽  
High Performance ◽  
Field Effect Transistors ◽  
Chlorinated Solvents ◽  
Acceptor Molecule ◽  
Organic Field Effect Transistors ◽  
Donor Acceptor ◽  
Halogenated Solvents

The polar non-chlorinated solvents were used as processed solvents for fabricating small molecule-based high-performance OFETs.

Quinoidal thioalkyl-substituted bithiophene small molecule semiconductors for n-type organic field effect transistors

2020 ◽  
Vol 8 (43) ◽  
pp. 15450-15458
Author(s):  
Vellaichamy Joseph ◽  
Chih-Hsin Yu ◽  
Chia-Chi Lin ◽  
Wei-Chieh Lien ◽  
Hsin-Chia Tsai ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Small Molecule ◽  
Electron Mobility ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Operational Stability ◽  
Side Chains ◽  
Organic Field Effect Transistors ◽  
Solution Processable

Solution-processable dicyanomethylene end-capped bithiophene quinoidal organic semiconductors with four inserted thioalkyl side chains exhibit an electron mobility of 0.18 cm2 V−1 s−1 with excellent ambient and operational stability.

Organic Field-Effect Transistors Based on Small-Molecule Organic Semiconductors Evaporated under Low Vacuum

2012 ◽  
Vol 5 (6) ◽  
pp. 061601 ◽  
Author(s):  
Takuto Takahashi ◽  
Sumika Tamura ◽  
Yuto Akiyama ◽  
Tomofumi Kadoya ◽  
Tadashi Kawamoto ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Small Molecule ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Organic Field Effect Transistors

Synthesis and characterization of carbazolo[2,1-a]carbazole in thin film and single crystal field-effect transistors

2017 ◽  
Vol 5 (28) ◽  
pp. 7020-7027 ◽  
Author(s):  
Miriam Más-Montoya ◽  
José Pedro Cerón-Carrasco ◽  
Shino Hamao ◽  
Ritsuko Eguchi ◽  
Yoshihiro Kubozono ◽  
...  
Keyword(s):  
Thin Film ◽  
Single Crystal ◽  
Crystal Field ◽  
Field Effect ◽  
High Performance ◽  
Field Effect Transistors ◽  
Synthesis And Characterization ◽  
Organic Field Effect Transistors ◽  
Crystal Field Effect

Carbazole-based azaphenacene with high performance in organic field-effect transistors.

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