Optical absorption and electrical properties of MPc (M =Fe, Cu, Zn)-TCNQ interfaces for optoelectronic applications

Sánchez-Vergara, María Elena; Gallardo, D. Medrano; Estrada, I.L. Vera; Sandoval, O. Jiménez

doi:10.1016/j.jpcs.2018.01.005

Cited by 13 publications

(5 citation statements)

References 47 publications

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“…A notable feature is dual operating regime; al low voltages (V ≤ 0.5 V), it is nearly ohmic. The current increases at a slightly lower rate after 0.5 V. The abrupt shift in slope indicates that the device has reached a Space Charge Limited Current (SCLC) regime, which is dictated by an exponential trap distribution [57][58][59][60]. By raising the voltages (V ≥ 0.5 V) to increase the current, it was possible to create a condition in which the carriers do not migrate fast enough and concentrate in a region of the heterostructure.…”

Section: Fabrication Of Thin Film Device and Electrical Characterizationmentioning

confidence: 99%

Deposition and Characterization of Heterostructures Based on Doped Ferrocene for Film-Device Applications

2022

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Novel heterostructures based on ferrocenium hexafluorophosphate (FcPF6), 2,6-dihydroxyanthraquinone (DHAQ) or 2,6-diaminoanthraquinone (DAAQ), zinc phthalocyanine (ZnPc) and nylon 11 were deposited by the high-vacuum thermal evaporation (HVTE) technique. Morphological and mechanical characterizations of these organic heterostructures FcPF6:DHAQ/nylon(ZnPc) and FcPF6:DAAQ/nylon(ZnPc) were carried out. Subsequently, corresponding optical parameters were calculated. The heterostructure with FcPF6:DHAQ presented the lowest optical band gap and fundamental band gap at 1.55 eV and 2.45 eV, respectively. The nylon(ZnPc) layer favors the optical behavior and places these heterostructures within organic low-bandgap semiconductor range. Additionally, devices were fabricated, and their electrical behavior was evaluated. The ITO/FcPF6:DHAQ/nylon(ZnPc)/Ag device exhibits ohmic behavior, and the ITO/FcPF6:DAAQ/nylon(ZnPc)/Ag device exhibits ohmic behavior at low voltages, but at V ≥ 5 V, its behavior changes to Space Charge Limited Current (SCLC). This device carries a maximum current of 0.02 A, three orders of magnitude higher than the current carried by the device with the DHAQ. The SCLC conduction mechanism showed a hole mobility of 9.27 × 10−8 (cm2)/Vs, the concentration of thermally excited holes of 3.01 × 1023 m−3, and trap concentration of 3.93 × 1021 m−3. FcPF6:DHAQ/nylon(ZnPc) and FcPF6:DAAQ/nylon(ZnPc) are potential candidates for organic devices as an emitter layer and active layer, respectively.

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Section: Fabrication Of Thin Film Device and Electrical Characterizationmentioning

confidence: 99%

Deposition and Characterization of Heterostructures Based on Doped Ferrocene for Film-Device Applications

2022

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“…where C is the film's capacitance, determined from results obtained by Dumm et al [12] for Li 2 Pc and A is the device's transversal area. Finally, the total trap concentration is given by [32]:…”

Section: Device Characterizationmentioning

confidence: 99%

Effect of Organic Dopants in Dimetallophthalocyanine Thin Films: Application to Optoelectronic Devices

Sánchez-Vergara¹,

Osorio-Lefler²,

Osorio-Lefler³

et al. 2019

AMPC

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Semiconductor films of organic, doped dimetallophthalocyanine M 2 Pcs (M = Li, Na) on different substrates were prepared by synthesis and vacuum evaporation. Tetrathiafulvalene (TTF) and tetracyanoquinodimethane (TCNQ) were used as dopants and the structure and morphology of the semiconductor films were studied using IR spectroscopy, X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS). The absorption spectra recorded in the ultraviolet-visible region for the deposited films showed the Q and Soret bands related to the electronic π-π* transitions in M 2 Pc molecules. Optical characterization of the films indicates electronic transitions characteristic of amorphous thin films with optical bandgaps between 1.2 and 2.4 eV. Finally, glass/ITO/doped M 2 Pc/Ag thin-film devices were produced and their electrical behavior was evaluated by using the four-tip collinear method. The devices manufactured from Na 2 Pc have a small rectifying effect, regardless of the organic dopant used, while the device manufactured from Li 2 Pc-TCNQ presents ohmic-like behavior at low voltages, with an insulating threshold around 19 V. Parameters such as the hole mobility (µ), the concentration of thermally-generated holes (p 0), the concentration of traps per unit of energy (P 0) and the total trap concentration (N t(e)) were also determined for the Li 2 Pc-TTF device.

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“…Tetracyanoquinodimethane (TCNQ), a well‐known organic semiconductor was first synthesized by Hertler et al [1–2] . Molecular materials obtained from TCNQ have a sturdy position in materials chemistry research due to versatile applications in optoelectronics, [3–4] organic conductors [5–7] and non‐linear optical (NLO) materials as they possesses high dipole moment, hyper polarizability in ground state [6,8–10] . Owing to a strong π ‐electron capability and facile nucleophilic substitution on TCNQ, reactions of TCNQ with primary/secondary amines lead to the mono/di‐substituted derivatives known as diaminodicyanoquinodimethanes (DADQ's) exhibiting quite different optical responses [9–12] .…”

Section: Introductionmentioning

confidence: 99%

Design and Development of Distinct Tetracyanoquinodimethane Derivatives Exhibiting Dual Effect of Fluorescence and Anticancer Activity

et al. 2021

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Tetracyanoquinodimethane (TCNQ) is known to react with primary/secondary amines to generate mono/di‐substituted TCNQ derivatives resulting in optical (fluorescence) and non‐linear optical characteristics. However, the choice of amine plays a key role in the sequel of certain material attributes. Nevertheless, demonstration of TCNQ derivatives, specifically obtained by reacting TCNQ with simple & small amine side chains of existing anticancer drugs, emerging in dual effect of fluorescence as well as anticancer activity, is not explored so far and has been still existing as a gap in TCNQ related research. Additionally, mono/di‐substituted TCNQ's owning strong fluorescence in solutions (∼10 to 104 order) than their solids are still lacking and are in need to be generated. In this regard, we aimed to synthesize straightforward TCNQ derivatives in single step by reacting TCNQ with specific (simple and small) amines being side chains of existing anticancer drugs (a contemporary design approach) and successfully obtained novel mono/di‐substituted TCNQ derivatives manifesting dual effect of fluorescence and anticancer activity. In this fashion, we have avoided the usage of bulky main moiety of an anticancer molecule, since our aim was not to use the total anticancer drug as such, like in a Pro‐drug preparation, but we intended to use the minimal part of an anticancer drug to invent novel TCNQ derivatives as anticancer active fluorophores. Wavelength of maximum emission for all the five potent molecules was within ∼525 nm‐696 nm. All compounds showed moderate anticancer activity against different cancer cell lines and IC50 values were in the range of 11 to 49 μM, when the synthesized novel compounds were tested in B16F10, MDA‐MB‐231 and A549 cell lines. Henceforth, this study has emanated in the first generation TCNQ derivatives as organic fluorescent anticancer active molecules.

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Optical absorption and electrical properties of MPc (M =Fe, Cu, Zn)-TCNQ interfaces for optoelectronic applications

Cited by 13 publications

References 47 publications

Deposition and Characterization of Heterostructures Based on Doped Ferrocene for Film-Device Applications

Deposition and Characterization of Heterostructures Based on Doped Ferrocene for Film-Device Applications

Effect of Organic Dopants in Dimetallophthalocyanine Thin Films: Application to Optoelectronic Devices

Design and Development of Distinct Tetracyanoquinodimethane Derivatives Exhibiting Dual Effect of Fluorescence and Anticancer Activity

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