Journal ArticleDOI
Effect of annealing on the mobility and morphology of thermally activated pentacene thin film transistors
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TLDR
In this paper, the effect of thermal annealing on the morphology and carrier mobility of the transistors was investigated and it was shown that only with a temperature below a critical temperature of approximately 45°C could improve the mobility.Abstract:
Pentacene thin film transistors (TFTs) were fabricated by the organic molecular beam deposition method. The TFTs were characterized in order to study the effect of thermal annealing on the morphology and carrier mobility of the transistors. For all the TFT samples the mobility exhibited an Arrhenius relationship with temperature, indicating a thermally activated transport that could be explained by the carrier trap and thermal release transport mechanism. Therefore, in order to investigate the annealing effect, we tested the data for a significant period of time after annealing until the temperature recovered to room temperature, so that the thermal activation effect was screened and possible effects of thermal expansion and stress were also ruled out. As a result, we found that only with a temperature below a critical temperature of approximately 45°C could annealing improve the mobility, while annealing with T>50°C would decrease the mobility compared to the value before annealing. Atomic force microsco...read more
Citations
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Self-powered flexible pressure sensors with vertically well-aligned piezoelectric nanowire arrays for monitoring vital signs
TL;DR: In this article, a vertically well-aligned piezoelectric nanowire array with preferential polarization orientation was used as a self-powered sensor for monitoring vital signs, which showed a linear relationship of output voltage versus compressive force with a high sensitivity.
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Surface engineering for high performance organic electronic devices: the chemical approach
TL;DR: In this article, the authors describe the growth of self-assembled monolayers (SAMs) of organic molecules on various surfaces of interest for this purpose (mainly metals and oxides).
Journal ArticleDOI
Oligothiophene Derivatives Functionalized with a Diketopyrrolopyrrolo Core for Solution-Processed Field Effect Transistors: Effect of Alkyl Substituents and Thermal Annealing
TL;DR: In this paper, two new oligothiophene derivatives bearing a diketopyrrolopyrrole core, 2,5-di-n-hexyl-3,6-bis(5′-nhexyl[2,2′;5′, 2′]terthiophen-5-yl)pyrrolo[3,4c]pyrrole-1,4-dione (DHT6DPPC12), and their use in solution-processed organic field effect transistors are reported.
Journal ArticleDOI
Sub-micron phase coexistence in small-molecule organic thin films revealed by infrared nano-imaging
Christian Westermeier,Christian Westermeier,Adrian Cernescu,Sergiu Amarie,Clemens Liewald,Fritz Keilmann,Bert Nickel,Bert Nickel +7 more
TL;DR: It is found that state-of-the-art pentacene films (grown on SiO2 at elevated temperature) are structurally not homogeneous but exhibit two interpenetrating phases at sub-micrometre scale, documented by a shifted vibrational resonance.
Journal ArticleDOI
Analysis of charge transport in a polycrystalline pentacene thin film transistor by temperature and gate bias dependent mobility and conductance
TL;DR: In this article, the gate bias and temperature dependent field effect mobility and conductance of a polycrystalline pentacene thin film transistor (TFT) were analyzed to study the charge transport in the material.
References
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Journal ArticleDOI
Intrinsic Charge Transport on the Surface of Organic Semiconductors
Vitaly Podzorov,Etienne Menard,A. Borissov,Valery Kiryukhin,John A. Rogers,Michael Gershenson +5 more
TL;DR: The air-gap field-effect technique enabled realization of the intrinsic (not limited by static disorder) polaronic transport on the surface of rubrene (C42H28) crystals over a wide temperature range.
Journal ArticleDOI
Stacked pentacene layer organic thin-film transistors with improved characteristics
TL;DR: In this article, photolithographically defined organic thin-film transistors (OTFTs) with improved field-effect mobility and sub-threshold slope were fabricated using two layers of pentacene deposited at different substrate temperatures.
Journal ArticleDOI
Temperature-independent transport in high-mobility pentacene transistors
TL;DR: In this article, the authors explored the charge-carrier transport mechanism in the organic semiconductor pentacene using thin-film transistor structures and found that the variation of the field-effect mobility with temperature differs from sample to sample, ranging from thermally activated to temperature-independent behavior.
Journal ArticleDOI
Spatially correlated charge transport in organic thin film transistors
Franco Dinelli,Mauro Murgia,Pablo Levy,Massimiliano Cavallini,Fabio Biscarini,Dago M. de Leeuw +5 more
TL;DR: In this paper, the authors studied the charge carrier mobility in organic ultrathin film field effect transistors as a function of the coverage and showed that the second layer is crucial, as it provides efficient percolation pathways for carriers generated in both the first and second layers.
Journal ArticleDOI
Temperature and gate voltage dependence of hole mobility in polycrystalline oligothiophene thin film transistors
TL;DR: In this paper, a method was developed to extract the carrier mobility from an analysis of the transfer characteristics of polycrystalline sexithiophene (6 T) transistors at temperatures ranging from 10 to 300 K.