Photochemical control of the carrier mobility in pentacene-based organic thin-film transistors

2010 ◽  
Vol 96 (21) ◽  
pp. 213303 ◽  
Author(s):  
Marco Marchl ◽  
Andrej W. Golubkov ◽  
Matthias Edler ◽  
Thomas Griesser ◽  
Peter Pacher ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Carrier Mobility ◽  
Organic Thin Film Transistors ◽  
Organic Thin Film

Overestimation of Carrier Mobility in Organic Thin Film Transistors Due to Unaccounted Fringe Currents

2019 ◽  
Vol 1 (3) ◽  
pp. 379-388 ◽  
Author(s):  
Ke Pei ◽  
Ming Chen ◽  
Zhiwen Zhou ◽  
Hanying Li ◽  
Paddy Kwok Leung Chan
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Carrier Mobility ◽  
Organic Thin Film Transistors ◽  
Organic Thin Film

scholarly journals Percolation of Carbon Nanoparticles in Poly(3-Hexylthiophene) Enhancing Carrier Mobility in Organic Thin Film Transistors

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Chang-Hung Lee ◽  
Chun-Hao Hsu ◽  
Iu-Ren Chen ◽  
Wen-Jong Wu ◽  
Chih-Ting Lin
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Carbon Nanoparticles ◽  
Carrier Mobility ◽  
Organic Thin Film Transistors ◽  
Organic Thin Film ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Printing System

To improve the field-effect mobility of all-inkjet-printed organic thin film transistors (OTFTs), a composite material consisted of carbon nanoparticles (CNPs) and poly(3-hexylthiophene) (P3HT) was reported by using homemade inkjet-printing system. These all-inkjet-printed composite OTFTs represented superior characteristics compared to the all-inkjet-printed pristine P3HT OTFTs. To investigate the enhancement mechanism of the blended materials, the percolation model was established and experimentally verified to illustrate the enhancement of the electrical properties with different blending concentrations. In addition, experimental results of OTFT contact resistances showed that both contact resistance and channel resistance were halved. At the same time, X-ray diffraction measurements, Fourier transform infrared spectra, ultraviolet-visible light, and photoluminescence spectra were also accomplished to clarify the material blending effects. Therefore, this study demonstrates the potential and guideline of carbon-based nanocomposite materials in all-inkjet-printed organic electronics.

Effect of dielectric/organic interface properties on the performance of the organic thin film transistors

2013 ◽  
Vol 1501 ◽  
Author(s):  
Ronak Rahimi ◽  
D. Korakakis
Keyword(s):  
Molecular Structure ◽  
Thin Film ◽  
Thin Film Transistors ◽  
Carrier Mobility ◽  
Charge Carrier Mobility ◽  
Organic Thin Film Transistors ◽  
Device Performance ◽  
Electrical Characteristics ◽  
Organic Thin Film ◽  
Organic Layers

ABSTRACTIn order to manufacture organic electronic devices with high performance, more detailed studies of the structure and the morphology of the organic materials as well as the underlying physical charge transport mechanisms are warranted. For instance, high efficiency organic thin film transistors (OTFTs) require materials with high charge carrier mobility [1, 2]. The parameters that determine the charge carrier mobility of the device include the structure of the first organic layer at the organic-dielectric interface as well as the morphology and the structural order of the other organic layers. Therefore, fundamental questions about structural properties of organic materials should be answered in order to optimize device performance [2-4].In this work, several bilayer structures of LiF/PTCDI-C8 and LiF/pentacene were prepared and their morphology and molecular structure were characterized using X-ray reflectivity (XRR) technique. In order to study the effects of the films’ structures and dielectric/organic interfacial properties on the device performance, OTFTs based on these bilayers were fabricated and characterized. It has been observed that PTCDI-C8 thin films have higher molecular packing in the LiF/PTCDI-C8 bilayer structure, which results in superior electrical characteristics for OTFTs based on this organic material. Devices with LiF/PTCDI-C8 bilayer exhibit about one order of magnitude higher output current (Ids) at a constant drain-source voltage (Vds) compared to the devices with LiF/pentacene bilayer. The observed differences in the electrical characteristics of these devices can be attributed to the effects of the dielectric/organic interface and the molecular structure of the organic layers.

Modeling the Organic Thin Film Transistors

2005 ◽  
Vol 871 ◽  
Author(s):  
Viorel Olariu ◽  
Robert Rotzoll ◽  
Siddharth Mohapatra ◽  
Robert Wenz ◽  
Michelle Grigas ◽  
...  
Keyword(s):  
Thin Film ◽  
Radio Frequency Identification ◽  
Thin Film Transistors ◽  
Carrier Mobility ◽  
Simulated Data ◽  
Logic Gates ◽  
Direct Consequence ◽  
Organic Thin Film Transistors ◽  
Organic Thin Film ◽  
Organic Transistor

AbstractOrganic thin-film transistors (OTFTs) appear to have become strong contenders to silicon based MOSFET devices whenever low-cost and relatively low performance circuits are required in applications such as radio frequency identification (RFID) for large volume supply chains. In order to develop circuits based on OTFTs, circuit designers require circuit models that predict the operation of OTFT with a reasonable accuracy. Although, generally, OTFT operation is similar to ordinary silicon MOSFET devices, there are several characteristics that clearly differentiate them. One important difference between the operation of the OTFT and the silicon MOSFET (that is a direct consequence of the physical implementation of OTFT) is that the organic transistor is normally operated in the accumulation mode, while the silicon transistor regularly operates in the inversion mode. Due to the molecular nature of the semiconductor, the carrier mobility is orders of magnitude lower than for the silicon MOSFET. Variable carrier mobility law, low on/off ratio, and the Schottky barrier at the interface between the source/drain metal contact and the organic semiconductor are among other important effects that had to be considered for developing of an accurate circuit model of the organic transistor. The developed model has been used to simulate DC characteristics and also simple circuits such as logic gates, ring oscillators, rectifiers, etc.This paper presents the developed model as well as a comparison between the simulated data and the experimental data. The experimental circuits were fabricated on flexible plastic substrates and employed a solution-cast dielectric. Pentacene was the semiconductor of choice with carrier mobility in the range of 0.1 – 1.5 cm2/V.s.

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