Gated Nonlinear Transport in Organic Thin Film Transistors

2003 ◽  
Vol 771 ◽  
Author(s):  
Behrang H. Hamadani ◽  
Douglas Natelson
Keyword(s):  
Field Effect Transistors ◽  
Organic Thin Film Transistors ◽  
Localized States ◽  
Nonlinear Transport ◽  
Organic Thin Film ◽  
Thermally Activated ◽  
Density Of Localized States ◽  
Highly Nonlinear ◽  
Channel Lengths ◽  
Energy Dependent

AbstractCharge transport in poly(3-hexylthiophene) field effect transistors has been studied in a series of devices with channel lengths ranging from 3 μm down to 200 nm over a broad range of temperatures and gate voltages. We report gate-modulated highly nonlinear transport at temperatures below ∼200 K that is consistent in form with a Poole-Frenkel-like hopping mechanism in the space charge limited current regime. There is also consistency between this behavior and the hypothesis that density of localized states is strongly energy dependent. We also observe what appears to be a crossover from thermally activated to nonthermal hopping below 30 K.

Organic thin-film transistors of phthalocyanines

2008 ◽  
Vol 80 (11) ◽  
pp. 2231-2240 ◽  
Author(s):  
Liqiang Li ◽  
Qingxin Tang ◽  
Hongxiang Li ◽  
Wenping Hu ◽  
Xiaodi Yang ◽  
...  
Keyword(s):  
Thin Film ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Crystal Packing ◽  
Organic Thin Film Transistors ◽  
Semiconductor Materials ◽  
Organic Thin Film ◽  
Future Prospects ◽  
Large Area ◽  
Packing Structure

Organic thin-film field-effect transistors (OTFTs) are emerging as attractive candidates for low-price, large-area, and flexible circuit applications. A variety of organic compounds have been utilized as active semiconductor materials for OTFTs, among which phthalocyanine compounds have attracted considerable attention owing to their remarkable chemical and thermal stability as well as good field-effect performance. Here, we review recent results on the phthalocyanine-based OTFTs. The correlation between the crystal packing structure and the charge transport property is discussed, and we conclude with a description of the future prospects for phthalocyanine-based OTFTs.

Determination of the Density of States on N-type Ptcdi-c13 Organic Thin-film Semiconductor

2012 ◽  
Vol 1435 ◽  
Author(s):  
J. Puigdollers ◽  
A. Marsal ◽  
S. Galindo ◽  
P. Carreras ◽  
C. Voz ◽  
...  
Keyword(s):  
Density Of States ◽  
Field Effect Transistors ◽  
Localized States ◽  
Optical Absorption Coefficient ◽  
Organic Thin Film ◽  
Channel Conductance ◽  
Spectroscopy Technique ◽  
Photothermal Deflection Spectroscopy ◽  
Photothermal Deflection

ABSTRACTIn this paper we study the density of states in n-type N,N’-ditridecylperylene-3,4,9,10-tetracarboxylic diimide organic semiconductor using two different methods. The first one is based on the temperature dependence of the channel conductance in field-effect transistors. The second one is based on the subgap optical absorption coefficient measured using the Photothermal Deflection Spectroscopy technique. Both techniques allow estimating the distribution of localized states in the band gap of the semiconductor.

CHARGE BEHAVIOR IN ORGANIC THIN FILM TRANSISTORS

2011 ◽  
Vol 20 (04) ◽  
pp. 727-748
Author(s):  
ALEJANDRA CASTRO-CARRANZA ◽  
BENJAMIN IÑIGUEZ ◽  
JOSEP PALLARÈS
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Current Model ◽  
Organic Thin Film Transistors ◽  
Localized States ◽  
Small Signal ◽  
Organic Thin Film ◽  
Signal Model ◽  
Small Signal Model ◽  
Charge Model

In this work, we review the physical properties of organic materials and transistors, discussing especially the charge transport mechanisms. Finally, we present an analytical and continuous charge model for Organic Thin Film Transistors (OTFTs) from which analytical expressions of all the total capacitances are obtained. They are developed and finally written as continuous explicit functions of the applied voltage, resulting in a complete charge-based small-signal model composed by a unified charge control model derived from Poisson equation assuming an exponential density of localized states. This charge model was developed from a previously proposed analytical DC current model assuming a hopping based transport. Therefore our complete small signal model has the potential to be successfully used in circuit simulators for the design of OTFTs.

scholarly journals Перенос заряда в планарных структурах на основе халькогенидной системы (As-=SUB=-2-=/SUB=-Se-=SUB=-3-=/SUB=-)-=SUB=-100-x-=/SUB=-Bi-=SUB=-x-=/SUB=-

2019 ◽  
Vol 53 (12) ◽  
pp. 1664
Author(s):  
Р.А. Кастро ◽  
С.Д. Ханин ◽  
А.П. Смирнов ◽  
А.А. Кононов
Keyword(s):  
Charge Transfer ◽  
Disordered Systems ◽  
Thin Layers ◽  
Localized States ◽  
Cbh Model ◽  
Thermally Activated ◽  
Transfer Processes ◽  
Density Of Localized States ◽  
Increasing Temperature ◽  
Thermally Activated Process

AbstractThe results of investigating charge-transfer processes in thin layers of a vitreous system (As_2Se_3)_100 – _ x Bi_ x are presented. A power-law dependence of the conductivity on the frequency and a decrease in the exponent s with increasing temperature are found. Charge transfer is a thermally activated process with two regions in the temperature dependence of the conductivity with the activation energies E _1 = 0.12 ± 0.01 eV and E _2 = 0.23 ± 0.01 eV, respectively. The results are explained in terms of the correlated barrier hopping (CBH) model of hopping conductivity in disordered systems. The main microparameters of the system are calculated: the density of localized states ( N ), the hopping length ( R _ω), and the largest height of the potential barrier ( W _ M ).

Directly probing the charge transport in initial molecular layers of organic polycrystalline field effect transistors

2021 ◽  
Author(s):  
Zheng Zhou ◽  
Jiawei Wang ◽  
Jiezhi Chen ◽  
Chao Jiang ◽  
Ling Li ◽  
...  
Keyword(s):  
Thin Film ◽  
Charge Transport ◽  
Active Layer ◽  
Thin Film Transistors ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Organic Thin Film Transistors ◽  
Organic Thin Film ◽  
Electrode Contact ◽  
Molecular Layers

We report the charge transport in pentacene polycrystalline organic thin film transistors (OTFTs) with different active layer thicknesses, ranging from a sub-monolayer, bilayer, to tens of nanometers by employing a novel electrode-contact architecture.

Temperature Dependence of Field-Effect Mobility in Organic Thin-Film Transistors: Similarity to Inorganic Transistors

2016 ◽  
Vol 16 (4) ◽  
pp. 3219-3222 ◽  
Author(s):  
Jun Okada ◽  
Takashi Nagase ◽  
Takashi Kobayashi ◽  
Hiroyoshi Naito
Keyword(s):  
Thin Film ◽  
Temperature Dependence ◽  
Thin Film Transistors ◽  
Field Effect ◽  
Carrier Transport ◽  
Organic Thin Film Transistors ◽  
Localized States ◽  
Organic Thin Film ◽  
Field Effect Mobility ◽  
Oxide Semiconductors

Carrier transport in solution-processed organic thin-film transistors (OTFTs) based on dioctylben-zothienobenzothiophene (C8-BTBT) has been investigated in a wide temperature range from 296 to 10 K. The field-effect mobility shows thermally activated behavior whose activation energy becomes smaller with decreasing temperature. The temperature dependence of field-effect mobility found in C8-BTBT is similar to that of others materials: organic semiconducting polymers, amorphous oxide semiconductors and hydrogenated amorphous silicon. These results indicate that hopping transport between isoenergetic localized states becomes dominated in a low temperature regime in these materials.

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