The effect of thermal annealing on the layered structure of smectic liquid crystalline organic semiconductor on polyimide gate insulator and its OFET performance

2016 ◽  
Vol 220 ◽  
pp. 311-317 ◽  
Author(s):  
Sohee Kim ◽  
Aryeon Kim ◽  
Kwang-Suk Jang ◽  
Sungmi Yoo ◽  
Jae-Won Ka ◽  
...  
Keyword(s):  
Thermal Annealing ◽  
Layered Structure ◽  
Organic Semiconductor ◽  
Liquid Crystalline ◽  
Gate Insulator

scholarly journals Impact of the post-thermal annealing on OFETs using printed contacts, printed organic gate insulator and evaporated C60 active layer

2018 ◽  
Vol 150 ◽  
pp. 51-59 ◽  
Author(s):  
Zhi Tao ◽  
Tayeb Mohammed-Brahim ◽  
Wei Lei ◽  
Maxime Harnois ◽  
Emmanuel Jacques
Keyword(s):  
Thermal Annealing ◽  
Active Layer ◽  
Gate Insulator

New possibility for an organic semiconductor: a smectic liquid crystalline semiconductor having a long conjugated core and two long alkyl chains

2005 ◽  
Vol 32 (7) ◽  
pp. 909-912 ◽  
Author(s):  
Yuichiro Haramoto ◽  
Yuko Kawada ◽  
Atushi Mochizuki ◽  
Masato Nanasawa ◽  
Seiji Ujiie ◽  
...  
Keyword(s):  
Organic Semiconductor ◽  
Liquid Crystalline ◽  
Alkyl Chains ◽  
Crystalline Semiconductor

scholarly journals Perpendicularly aligned nanodomains on versatile substrates via rapid thermal annealing assisted by liquid crystalline ordering in block copolymer films

2020 ◽  
Vol 2 (4) ◽  
pp. 1523-1530
Author(s):  
Ting Qu ◽  
Song Guan ◽  
Xiaoxiong Zheng ◽  
Aihua Chen
Keyword(s):  
Block Copolymer ◽  
Thermal Annealing ◽  
Rapid Thermal Annealing ◽  
Liquid Crystalline ◽  
Copolymer Films

The highly ordered perpendicularly aligned cylindrical and lamellar microdomains within block copolymer (BCP) films have important applications in diverse fields.

The Sensitivity of Small Molecule Sorption to Annealing in Glassy Liquid Crystalline Polymers

1993 ◽  
Vol 321 ◽  
Author(s):  
Atsushi Morisato ◽  
N. R. Miranda ◽  
J. T. Willits ◽  
G. R. Cantrell ◽  
B. D. Freeman ◽  
...  
Keyword(s):  
Thermal Annealing ◽  
Small Molecule ◽  
Liquid Crystalline ◽  
Liquid Crystalline Polymers ◽  
Higher Order ◽  
Systematic Variation ◽  
Chain Packing ◽  
Crystalline Polymers ◽  
Crystalline Order ◽  
Annealing Conditions

ABSTRACTThe sorption of organic penetrants is found to be sensitive to thermal annealing conditions in a series of glassy, nematic, thermotropic, random copolyesters. Controlled thermal annealing of two polymers in this series permitted a systematic variation of chain packing and, presumably, higher order molecular suprastructure, ranging from a disordered amorphous morphology to More ordered nematic liquid crystalline and semi-crystalline morphologies. The development of liquid crystalline order appears to reduce or preclude small molecule solubility in nematically ordered forms of these polymers.

Thermal Annealing Effect on the Thermal and Electrical Properties of Organic Semiconductor Thin Films

MRS Advances ◽  
2016 ◽  
Vol 1 (22) ◽  
pp. 1637-1643 ◽  
Author(s):  
Xinyu Wang ◽  
Boyu Peng ◽  
Paddy Chan
Keyword(s):  
Thermal Conductivity ◽  
Electrical Properties ◽  
Thermal Annealing ◽  
Organic Semiconductor ◽  
Field Effect ◽  
Annealing Temperature ◽  
Waste Heat ◽  
Annealing Effect ◽  
Field Effect Mobility ◽  
Thermal And Electrical Properties

ABSTRACTThe thermal and electrical properties of organic semiconductor are playing critical roles in the device applications especially on the devices with large area. Although the effect may be minor in a single device like field effect transistors, the unwanted waste heat would cause much more severe problems in large-scale devices as the power density will go up significantly. The waste heat would lead to performance degradation or even failure of the devices, and thus a more detailed study on the thermal conductivity and carrier mobility of the organic thin film would be beneficial to predict the limits of the device or design a thermally stable device. Here we explore the thermal annealing effect on the thermal and electrical properties of the small molecule organic semiconductor, dinaphtho[2,3-b:2’,3’-f]thieno[3,2-b]thiophene (DNTT). After the post deposition thermal annealing, the grain size of the film increases and in-plane crystallinity improves while cross-plane crystallinity keeps relatively constant. We demonstrated the cross-plane thermal conductivity is independent of the thermal annealing temperature and high annealing temperature will reduce the space-charge-limited current (SCLC) mobility. When the annealing temperature increase from 24 °C to 140 °C, the field effect mobility shows a gradual increase while the threshold voltage shifts from positive to negative. The different dependence of the SCLC mobility and field effect mobility on the annealing temperature suggest the improvement of the film crystallinity after thermal annealing is not the only dominating effect. Our investigation provides the constructive information to tune the thermal and electrical properties of organic semiconductors.

Dynamics of Defect Annihilation in Vitrified Liquid Crystalline (VLC) Thin Films Upon Thermal Annealing

1996 ◽  
Vol 425 ◽  
Author(s):  
H. Shi ◽  
D. Katsis ◽  
S. H. Chen ◽  
M. E. De Rosa ◽  
W. W. Adams ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Annealing ◽  
Liquid Crystalline ◽  
Structural Similarity ◽  
Annihilation Process ◽  
Chiral Nematic

AbstractBased on a series of model nematic and chiral-nematic compounds as well as a polymer analog, it was found that the annihilation of defects in a VLC system occurs at a much faster rate than its polymer analog. In chiral-nematic blends, the degree of structural similarity between the nematic host and the chiral dopant plays an important role; a wider biphasic region contributes to a slower annihilation process.

Investigation on different organic semiconductor/organic dielectric interfaces in pentacene-based thin-film transistors

2007 ◽  
Vol 1029 ◽  
Author(s):  
Emanuele Orgiu ◽  
Mohammad Taki ◽  
Beatrice Fraboni ◽  
Simone Locci ◽  
Annalisa Bonfiglio
Keyword(s):  
Thin Film ◽  
Organic Semiconductor ◽  
Thin Film Transistors ◽  
Hole Transport ◽  
Gate Insulator ◽  
Semiconductor Layer ◽  
Poly Vinyl Alcohol ◽  
Physical Interaction ◽  
Organic Thin Film ◽  
Organic Dielectrics

AbstractOrganic Thin-Film Transistors (OTFTs) in top-contact configuration and Metal-Insulator-Semiconductor (MIS) structures with different organic dielectrics as the gate insulator have been fabricated using the same organic semiconductor layer, pentacene, in order to investigate the changes in the electrical behavior by varying the interface properties. A gold bottom gate electrode was sputtered on a glass substrate whereas gold source and drain were thermally evaporated onto the pentacene layer. Several organic dielectrics have been tested as insulating layers, namely were poly(vinyl alcohol) (PVA), polyvinyl alcohol with ammonium dichromate (PVAad) as a cross-linking agent, poly (4-vinyl phenol) (PVP), poly(dimethylsiloxane) (PDMS) and poly(methylsilsesquioxane) (pMSSQ). The interesting differences found out by varying the interface confirm that the chemical-physical interaction between semiconductor and dielectric is crucial for the conduction mechanisms of the charge carriers. In particular we observed that the electron traps can influence not only the electron transport, therefore allowing a more or less marked ambipolar behavior, but also affect the hole transport.

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