scholarly journals Synthesis and Effect of the Structure of Bithienyl-Terminated Surfactants for Dielectric Layer Modification in Organic Transistor

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6345
Author(s):  
Lucia Feriancová ◽  
Iveta Kmentová ◽  
Michal Micjan ◽  
Milan Pavúk ◽  
Martin Weis ◽  
...  
Keyword(s):  
Alkyl Chain ◽  
Field Effect Transistors ◽  
Dielectric Surface ◽  
Organic Field Effect Transistors ◽  
Organic Transistor ◽  
Effective Mobility ◽  
Palladium Catalyzed ◽  
Order Of Magnitude ◽  
Anchoring Groups ◽  
Chain Lengths

A series of bithienyl-terminated surfactants with various alkyl chain lengths (from C8 to C13) and phosphono or chlorodimethylsilyl anchoring groups were synthesized by palladium-catalyzed hydrophosphonation, or platinum-catalyzed hydrosilylation as a key step. Surfactants were tested in pentacene or α-sexithiophene-based organic field-effect transistors (OFETs) for the modification of the dielectric surface. The studied surfactants increased the effective mobility of the α-sexithiophene-based device by up to one order of magnitude. The length of alkyl chain showed to be significant for the pentacene-based device, as the effective mobility only increased in the case of dielectric modification with bithienylundecylphosphonic acid. AFM allowed a better understanding of the morphology of semiconductors on bare SiO2 and surfaces treated with bithienylundecylphosphonic acid.

scholarly journals Channel length-dependent characterisations of organic thin-film transistors with solution processable gadolinium phthalocyanine derivatives

2019 ◽  
Vol 31 (1) ◽  
pp. 265-273 ◽  
Author(s):  
Seema Barard ◽  
Debdyuti Mukherjee ◽  
Sujoy Sarkar ◽  
T. Kreouzis ◽  
I. Chambrier ◽  
...  
Keyword(s):  
Field Effect ◽  
Liquid Crystalline ◽  
Field Effect Transistors ◽  
Channel Length ◽  
Organic Field Effect Transistors ◽  
Organic Thin Film ◽  
Active Layers ◽  
Order Of Magnitude ◽  
Scaling Down ◽  
Voltage Swing

AbstractSpin-coated 52-nm-thick films of newly synthesised gadolinium liquid crystalline bisphthalocyanine sandwich (GdPc2) complexes with octyl chains non-peripheral positions have been successfully employed as active layers for bottom-gate organic field effect transistors having both short $$(5\,\upmu {\text{m}})$$(5μm) and long $$( 20\,\upmu {\text{m}})$$(20μm) channels. The scaling down of the channel length $$( L )$$(L) decreases the field effect mobility due to the increase in the contact resistance between the gold electrodes and the GdPc2 semiconducting layer. Values of on–off ratio and sub-threshold voltage swing are higher nearly one order of magnitude for $$L = 5 \,\upmu{\text{ m}}$$L=5μm than those for $$L = 20\;\upmu m$$L=20μm.

scholarly journals Fluorene-Based Donor-Acceptor Copolymers Containing Functionalized Benzotriazole Units: Tunable Emission and their Electrical Properties

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 256 ◽  
Author(s):  
Iván Torres-Moya ◽  
Rebeca Vázquez-Guilló ◽  
Sara Fernández-Palacios ◽  
José Ramón Carrillo ◽  
Ángel Díaz-Ortiz ◽  
...  
Keyword(s):  
Density Functional ◽  
Field Effect Transistors ◽  
Photophysical Properties ◽  
Suzuki Reaction ◽  
Organic Field Effect Transistors ◽  
Functional Theory ◽  
Organic Optoelectronics ◽  
Donor Acceptor ◽  
Chain Lengths ◽  
Tunable Emission

Monomers 4,7-dibromo-2H-benzo[d]1,2,3-triazole (m1) and 4,7-(bis(4-bromophenyl)ethynyl)-2H-benzo[d]1,2,3-triazole (m2) have been synthesized in good yields using different procedures. Monomers m1 and m2 have been employed for building new copolymers of fluorene derivatives by a Suzuki reaction under microwave irradiation using the same conditions. In each case different chain lengths have been achieved, while m1 gives rise to polymers for m2 oligomers have been obtained (with a number of monomer units lower than 7). Special interest has been paid to their photophysical properties due to excited state properties of these D-A units alternates, which have been investigated by density functional theory (DFT) calculations using two methods: (i) An oligomer approach and (ii) by periodic boundary conditions (PBC). It is highly remarkable the tunability of the photophysical properties as a function of the different monomer functionalization derived from 2H-benzo[d]1,2,3-triazole units. In fact, a strong modulation of the absorption and emission properties have been found by functionalizing the nitrogen N-2 of the benzotriazole units or by elongation of the π-conjugated core with the introduction of alkynylphenyl groups. Furthermore, the charge transport properties of these newly synthesized macromolecules have been approached by their implementation in organic field-effect transistors (OFETs) in order to assess their potential as active materials in organic optoelectronics.

High performance top-gate field-effect transistors based on poly(3-alkylthiophenes) with different alkyl chain lengths

2014 ◽  
Vol 15 (2) ◽  
pp. 372-377 ◽  
Author(s):  
Kenichiro Takagi ◽  
Takashi Nagase ◽  
Takashi Kobayashi ◽  
Hiroyoshi Naito
Keyword(s):  
Field Effect ◽  
High Performance ◽  
Alkyl Chain ◽  
Field Effect Transistors ◽  
Chain Lengths

Effect of dielectric surface passivation on organic field-effect transistors: spectral analysis of the density of trap-states

2021 ◽  
Vol 37 (1) ◽  
pp. 015015
Author(s):  
Yogesh Yadav ◽  
Samarendra Pratap Singh
Keyword(s):  
Contact Resistance ◽  
Field Effect ◽  
Surface Passivation ◽  
Field Effect Transistors ◽  
Contact Potential Difference ◽  
Dielectric Surface ◽  
Trap States ◽  
Organic Field Effect Transistors ◽  
The Impact ◽  
Lower Contact

Abstract The semiconductor/dielectric interface is arguably the most important region in field-effect transistors. This article investigates the performance-enhancing effects of passivation of the dielectric surface by a self-assembled layer (SAM) of silanes on organic field-effect transistors. Apart from conventional figures of merit for the devices, the energetic distribution of the density of the in-gap trap-states (trap-DOS) and the contact resistance are evaluated using numerical methods. The investigation reveals that the surface passivation of the dielectric SiO2 has a dual effect on device operation. Firstly, it establishes quantitatively that the surface passivation leads to a significant reduction in the density of both shallow and deep traps in the organic semiconductor PBTTT-C14. This effect outweighs the impact of the SAM dipoles on the device turn-on. Secondly, the contact resistance gets lowered by a factor of more than 10 due to the improved top-surface morphology of the PBTTT-C14 thin film. The lower contact resistance in devices is corroborated by lower contact potential difference between PBTTT-C14 and gold, measured using scanning kelvin probe microscopy.

Direct Effect of Dielectric Surface Energy on Carrier Transport in Organic Field-Effect Transistors

2018 ◽  
Vol 10 (18) ◽  
pp. 15943-15951 ◽  
Author(s):  
Shujun Zhou ◽  
Qingxin Tang ◽  
Hongkun Tian ◽  
Xiaoli Zhao ◽  
Yanhong Tong ◽  
...  
Keyword(s):  
Surface Energy ◽  
Direct Effect ◽  
Field Effect ◽  
Carrier Transport ◽  
Field Effect Transistors ◽  
Dielectric Surface ◽  
Organic Field Effect Transistors
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