Fabrication of ring oscillators using organic molecules of phenacene and perylenedicarboximide

Fioravanti, Niko; Pierantoni, Luca; Mencarelli, Davide; Turchetti, Claudio; Hamao, Shino; Okamoto, Hideki; Goto, Hidenori; Eguchi, Ritsuko; Fujiwara, Akihiko; Kubozono, Yoshihiro

doi:10.1039/d1ra00511a

Cited by 5 publications

(5 citation statements)

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“…The excitons of PTCDI at the P3HT/PTCDI heterojunction can be dissociated by their HOMO difference, causing hole transfer from PTCDI to P3HT. The hole mobility of P3HT and the electron mobility of PTCDI can reach above 10 –1 cm 2 V –1 s –1 and are comparable. − ,− Resultantly, the electrons from exciton dissociation are not as localized in PTCDI as in Alq3, and the holes from exciton dissociation can contribute to the hole current of the P3HT layer. Therefore, in the time-resolved I D measurement, an increased I D value of the PTCDI/Alq3-covered device during the green light irradiation is observed (Figure f).…”

Section: Resultsmentioning

confidence: 99%

“…During the positive V G sweep, electrons accumulate in the PTCDI layer. Electron transport in PTCDI is delocalized, compared with Alq3, because PTCDI possesses an electron mobility at the level of 10 –1 cm 2 V –1 s –1 . − As the positive V G decreases, the number of the accumulated electrons in PTCDI is reduced. Different from Alq3, no additional electrons generate a negative bias voltage to induce hole formation in the P3HT active layer.…”

Section: Resultsmentioning

confidence: 99%

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Ultraviolet Light-Activated Charge Modulation Heterojunction for Versatile Organic Thin Film Transistors

Lin

et al. 2021

ACS Appl. Mater. Interfaces

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Organic thin film transistors (OTFTs) are a promising technology for the application of photosensors in smart wearable devices. Light-induced electrical behavior of OTFTs is explored to achieve diverse functional requirements. In most studies, OTFTs show an increased drain current (I D) under light irradiation. Here, we use an ultraviolet (UV) light absorption top layer, tris(8-hydroxyquinoline) aluminum (Alq3), to improve the UV light response of poly(3-hexylthiophene-2,5-diyl) (P3HT)-based OTFTs. Unexpectedly, the Alq3-covered device operated at the accumulation mode demonstrates a decreased I D during the UV light irradiation. N,N′-Ditridecyl-3,4,9,10-perylene tetracarboxylic diimide (PTCDI, electron acceptor), pentacene (electron donor), and lithium fluoride (LiF, insulator) as an interlayer were inserted between the P3HT and the Alq3 layers. The PTCDI/Alq3-covered device also shows an unusual decrease in I D under the UV light but an increase in I D under the green light. The pentacene/Alq3-covered device shows an increased I D during the UV light irradiation and, unexpectedly, a memory effect in I D after removing the UV light. The LiF/Alq3-covered device exhibits an electrical behavior similar to the bare P3HT-based device under the UV light. Results of spectroscopic analyses and theoretical calculations have shown that the occurrence of charge transfer at heterojunctions during the UV light irradiation causes charge modulation in the multilayered P3HT-based OTFTs and then results in an unusual decrease or memory effect in I D. In addition, the unexpected I D reduction can be observed in the Alq3-covered poly[2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene]-based OTFTs under UV light. The features, including opposite electrical responses to different wavelengths of light and optical memory effect, provide the multilayered P3HT-based OTFTs with potential for various optical applications, such as image recognition devices, optical logic gates, light dosimeters, and optical synapses.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Ultraviolet Light-Activated Charge Modulation Heterojunction for Versatile Organic Thin Film Transistors

Lin

et al. 2021

ACS Appl. Mater. Interfaces

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“…VCO may be realized with many configurations according to the applications and performance requirements. The available fundamental approaches are ring oscillator [1]- [3], inductance-capacitance (LC) oscillator [4], [5] tunable active inductor (TAI) based oscillator [6], [7], and relaxation oscillator [8]. Apart from the phase noise (PN); tuning range, power consumption, and output waveform are also necessary VCO specifications.…”

Section: Introductionmentioning

confidence: 99%

Design and performance analysis of low phase noise LC-voltage controlled oscillator

Gurjar¹,

Mishra²

2023

TELKOMNIKA

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Voltage controlled oscillator (VCO) offers the radio frequency (RF) system designer a freedom to select the required frequency. Today's wireless communication system imposes a very stringent requirement in terms of phase noise generated in VCO. This study presents an inductive source degeneration technique to improve the phase noise performance of the inductance-capacitance (LC)-VCO. Double cross-coupled topology has been chosen for the proposed VCO. The post layout simulations with the parasitic resistance, inductance, capacitance (RLC) extracted view is carried out with united microelectronics corporations (UMC) 0.18 µm process by spectre simulator of cadence tools. The proposed VCO provides a phase noise of -124.3 dBc/Hz @ 1 MHz. The tuning range obtained is 19.87% with a centre frequency of 2.46 GHz which makes it suitable for industrial, scientific, and medical (ISM) band applications. It consumes a power of 2.10 mW. Also, a good figure of merit of -189 is achieved. The total layout area occupied is 477×545 µm 2 .

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“…Field-effect transistors (FETs) that use various organic molecules have been extensively studied over the past decade. The FET using pentacene, which has a linear structure of five fused benzene rings (acene-type molecule), was reported as a representative organic FET using a small molecule, which showed the p -channel FET property with relatively high mobility. − Furthermore, FETs using [ n ]phenacene with a W-shaped structure of fused benzene rings (phenacene-type molecules) have been extensively studied and have demonstrated high-performance p -channel FET properties and various functionalities. − Here, n is the number of fused benzene rings. The [ n ]phenacene and phenacene derivatives are generally more stable in air than acene-type molecules such as pentacene.…”

Section: Introductionmentioning

confidence: 99%

Charge Transport Capabilities of Dibenzo[n]phenacenes (n = 5–7): Influence of Trap States and Molecular Packing

et al. 2022

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A high carrier transport capability with strong π−π interactions is expected to result from the extension of π conjugation in small molecules. This is an important factor to create promising molecules, leading to the development of high-performance and new applications in organic electronic devices. We systematically demonstrate the charge transport capability and trap density of states in dibenzo[n]phenacenes (DBnPs) (n = 5−7) with a hybrid π structure between the phenacene and acene cores. A DB6P field-effect transistor (FET) achieves a relatively high-field-effect mobility beyond 2 cm 2 V −1 s −1 , which indicates excellent FET performance in comparison with DB5P and DB7P. The calculated charge-transfer integrals based on the crystal structure and the distribution of the trap density of states confirm the superior transport capability and FET properties in DB6P. We demonstrate that molecules with C 2h symmetry result in high crystallinity and close packing in crystals, leading to high-performance FETs.

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Fabrication of ring oscillators using organic molecules of phenacene and perylenedicarboximide

Abstract: A ring oscillator consisting of p-channel and n-channel organic FETs.

Cited by 5 publications

References 46 publications

Ultraviolet Light-Activated Charge Modulation Heterojunction for Versatile Organic Thin Film Transistors

Ultraviolet Light-Activated Charge Modulation Heterojunction for Versatile Organic Thin Film Transistors

Design and performance analysis of low phase noise LC-voltage controlled oscillator

Charge Transport Capabilities of Dibenzo[n]phenacenes (n = 5–7): Influence of Trap States and Molecular Packing

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