scholarly journals Progress of the improved mobilities of organic field-effect transistors based on dielectric surface modification

2012 ◽  
Vol 61 (22) ◽  
pp. 228502
Author(s):  
Shi Wei-Wei ◽  
Li-Wen ◽  
Yi Ming-Dong ◽  
Xie Ling-Hai ◽  
Wei-Wei ◽  
...  
Keyword(s):  
Surface Modification ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Dielectric Surface ◽  
Organic Field Effect Transistors

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

scholarly journals Geometry Control of Source/Drain Electrodes in Organic Field-Effect Transistors by Electrohydrodynamic Inkjet Printing

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4974
Author(s):  
Piotr Sleczkowski ◽  
Michal Borkowski ◽  
Hanna Zajaczkowska ◽  
Jacek Ulanski ◽  
Wojciech Pisula ◽  
...  
Keyword(s):  
Cross Section ◽  
Inkjet Printing ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Single Layer ◽  
Dielectric Surface ◽  
Design Guidelines ◽  
Organic Field Effect Transistors ◽  
Semiconducting Polymer ◽  
Silver Electrodes

In this work we study the influence of dielectric surface and process parameters on the geometry and electrical properties of silver electrodes obtained by electrohydrodynamic inkjet printing. The cross-section and thickness of printed silver tracks are optimized to achieve a high conductivity. Silver overprints with cross-section larger than 4 μm2 and thickness larger than 90 nm exhibit the lowest resistivity. To fabricate electrodes in the desired geometry, a sufficient volume of ink is distributed on the surface by applying appropriate voltage amplitude. Single and multilayer overprints are incorporated as bottom contacts in bottom gate organic field-effect transistors (OFETs) with a semiconducting polymer as active layer. The multilayer electrodes result in significantly higher electrical parameters than single layer contacts, confirming the importance of a careful design of the printed tracks for reliable device performance. The results provide important design guidelines for precise fabrication of electrodes in electronic devices by electrohydrodynamic inkjet printing.

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