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Proceedings ArticleDOI

Effect of TIPS-Pentacene:Polystyrene Blend Ratio on Electrical Performance and Stability of Solution Processed Organic Field-Effect Transistors

01 Dec 2018-
Abstract: We report the effect of varying the semiconductor:polymer blend ratio on the electrical performance and bias-stress stability of the organic field effect transistors (OFETs) with TIPS-Pentacene and polystyrene as semiconductor and polymer combination. Device performance was found to improve with increasing polymer content in the solution. Devices with 1:3 TIPS-Pentacene:polystyrene blend outperformed the other counterparts with high performance, and demonstrated least performance variation with regular 100 transfer measurement cycles. In addition, 1:3 blend devices have shown the least normalized drain current decay of $\sim$ 8.5 % with the bias stress condition of V DS = V GS = -30 V for 2 h, as compared to the 1:1, 3:1 and neat devices with the decay of 15 %, 37 % and 71 % respectively. Additionally, a better recovery of electrical characteristics was observed in blend devices with larger polymer fractions from the deteriorating effects of gate bias stress.
Topics: Polymer blend (63%), Polystyrene (51%), Pentacene (50%), Field-effect transistor (50%)
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Proceedings ArticleDOI
01 Jul 2021-
Abstract: This paper presents TCAD modelling of the 6,13-bis(triisopropylsilylethynyl) Pentacene OTFT. The model is based on defect description and charge reproduction and recombination. This model incorporates metal-semiconductor-insulator interface and contact barrier, field-dependent mobility in TIPS pentacene film. It consists of ‘hopping mobility model’ and ‘multiple trapping and release model’. It describes deep, tail DOS both, and not only matches electrical behavior but also gives a panorama of charge injection, carrier transportation. This model can be used for simulation of other structures also.

References
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Journal ArticleDOI
Abstract: We have fabricated pentacene organic thin-film transistor (OTFT) driven active matrix organic light-emitting diode (OLED) displays on flexible polyethylene terephthalete substrates These displays have 48×48 bottom-emission OLED pixels with two pentacene OTFTs used per pixel Parylene is used to isolate the OTFTs and OLEDs with good OTFT yield and uniformity

557 citations


Journal ArticleDOI
TL;DR: It is shown that blends comprising a small amount of semiconducting polymer mixed into an insulating polymer matrix actually perform very poorly in the undoped state, and that mobility and on/off ratio are improved dramatically upon moderate doping.
Abstract: Polymer transistors are being intensively developed for next-generation flexible electronics. Blends comprising a small amount of semiconducting polymer mixed into an insulating polymer matrix have simultaneously shown superior performance and environmental stability in organic field-effect transistors compared with the neat semiconductor. Here we show that such blends actually perform very poorly in the undoped state, and that mobility and on/off ratio are improved dramatically upon moderate doping. Structural investigations show that these blend layers feature nanometre-scale semiconductor domains and a vertical composition gradient. This particular morphology enables a quasi three-dimensional spatial distribution of semiconductor pathways within the insulating matrix, in which charge accumulation and depletion via a gate bias is substantially different from neat semiconductor, and where high on-current and low off-current are simultaneously realized in the stable doped state. Adding only 5 wt% of a semiconducting polymer to a polystyrene matrix, we realized an environmentally stable inverter with gain up to 60.

218 citations


"Effect of TIPS-Pentacene:Polystyren..." refers methods in this paper

  • ...Despite of the challenges involved in improving the quality of dielectricsemiconductor interface in solution processed OFETs, various ways have been proposed to obtain excellent device performance [7-10]....

    [...]


Journal ArticleDOI
05 Oct 2007-Advanced Materials
Abstract: Progress in environmental stability and processability, and the increase of the field-effect mobility of organic semiconductors has triggered their use as the active element in microelectronic devices. The advantages of their application are the easy processing, for example, spin-coating and ink-jet printing, without a temperature hierarchy, and their mechanical flexibility. Applications are foreseen in the field of large-area electronics where numerous devices are integrated on low-cost substrates such as plastics. The first flexible, even rollable, quarter video graphics array (QVGA) active matrix displays based on organic semiconductors have already been reported.[1]

211 citations


3


"Effect of TIPS-Pentacene:Polystyren..." refers background in this paper

  • ...The shift in threshold voltage with the bias stress is expressed as a stretched exponential function [18]....

    [...]


Journal ArticleDOI
21 Oct 2011-Nano Letters
TL;DR: A novel approach is demonstrated that enables us to reversibly photocontrol the carrier density at the interface by using photochromic spiropyran (SP) self-assembled monolayers (SAMs) sandwiched between active semiconductors and gate insulators.
Abstract: Interface modification is an effective and promising route for developing functional organic field-effect transistors (OFETs). In this context, however, researchers have not created a reliable method of functionalizing the interfaces existing in OFETs, although this has been crucial for the technological development of high-performance CMOS circuits. Here, we demonstrate a novel approach that enables us to reversibly photocontrol the carrier density at the interface by using photochromic spiropyran (SP) self-assembled monolayers (SAMs) sandwiched between active semiconductors and gate insulators. Reversible changes in dipole moment of SPs in SAMs triggered by lights with different wavelengths produce two distinct built-in electric fields on the OFET that can modulate the channel conductance and consequently threshold voltage values, thus leading to a low-cost noninvasive memory device. This concept of interface functionalization offers attractive new prospects for the development of organic electronic dev...

128 citations


"Effect of TIPS-Pentacene:Polystyren..." refers background in this paper

  • ...In OFETs, the dielectric-semiconductor interface is the most crucial location, quality of which directly influences the electrical performance and stability [5, 6]....

    [...]


Journal ArticleDOI
Abstract: With the advances of organic field-effect transistors (OFETs), the interface between semiconductors and dielectrics has received much attention due to its dramatic effects on the morphology and charge-transport of organic semiconductors in OFETs. The purpose of this review is to give an overview of the recent progress in the engineering of the dielectric–semiconductor interface in OFETs. The interface-dependent performances of OFETs are reviewed, and interfacial control methods are especially dealt with an aim to solve interfacial effects. Finally, novel applications of the dielectric–semiconductor interface for achieving multifunctions are summarized to offer a clear map of interface engineering in OFETs.

126 citations


"Effect of TIPS-Pentacene:Polystyren..." refers background in this paper

  • ...In OFETs, the dielectric-semiconductor interface is the most crucial location, quality of which directly influences the electrical performance and stability [5, 6]....

    [...]


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20211