Optical and Electrical Properties of TTF-MPcs (M = Cu, Zn) Interfaces for Optoelectronic Applications

Sánchez-Vergara, María Elena; Leyva-Esqueda, Mariel; Alvarez-Bada, J. R.; Garcı́a-Montalvo, Verónica; Rojas-Montoya, Iván D.; Jiménez‐Sandoval, O.

doi:10.3390/molecules201219742

Cited by 18 publications

(6 citation statements)

References 37 publications

(81 reference statements)

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“…The diode-like behavior of this material could be attributed to the addition of TTF in the doping process, which leads to the formation of a homogeneous material with an apparent p-n junction. CuPc-TTF behavior could be attributed to the formation of alternative paths for carrier conduction due to p-type doping of the organic semiconductor with TTF, as has been reported in earlier studies [48]. It is worth mentioning that the measurements were done at room temperature under different illumination conditions in order to evaluate how would the device behave under the effect of solar irradiation, including natural and artificial white light, as well as red, orange, yellow, green, blue, and UV light.…”

Section: Resultssupporting

confidence: 60%

CuPc: Effects of its Doping and a Study of Its Organic-Semiconducting Properties for Application in Flexible Devices

et al. 2019

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This study refers to the doping of organic semiconductors by a simple reaction between copper phthalocyanine and tetrathiafulvalene or tetracyanoquinodimethane. The semiconductor films of copper phthalocyanine, doped with tetrathiafulvalene donor (CuPc-TTF) and tetracyanoquinodimethane acceptor (CuPc-TCNQ) on different substrates, were prepared by vacuum evaporation. The structure and morphology of the semiconductor films were studied with infrared (IR) spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). The absorption spectra for CuPc-TTF, recorded in the 200–900 nm UV–vis region for the deposited films, showed two peaks: a high energy peak, around 613 nm, and a second one, around 695 nm, with both peaks corresponding to the Q-band transition of the CuPcs. From the spectra, it can also be seen that CuPc-TTF has a B-band at around 330 nm and has a bandgap of approximately 1.4 eV. The B-band in the CuPc-TCNQ spectrum is quite similar to that of CuPc-TTF; on the other hand, CuPc-TCNQ does not include a Q-band in its spectrum and its bandgap value is of approximately 1.6 eV. The experimental optical bandgaps were compared to the ones calculated through density functional theory (DFT). In order to prove the effect of dopants in the phthalocyanine semiconductor, simple devices were manufactured and their electric behaviors were evaluated. Devices constituted by the donor-acceptor active layer and by the hollow, electronic-transport selective layers, were deposited on rigid and flexible indium tin oxide (ITO) substrates by the vacuum sublimation method. The current–voltage characteristics of the investigated structures, measured in darkness and under illumination, show current density values of around 10 A/cm2 for the structure based on a mixed-PET layer and values of 3 A/cm2 for the stacked-glass layered structure. The electrical properties of the devices, such as carrier mobility (μ) were obtained from the J–V characteristics. The mobility values of the devices on glass were between 1.59 × 109 and 3.94 × 1010 cm2/(V·s), whereas the values of the devices on PET were between 1.84 × 109 and 4.51 × 109 cm2/(V·s). The different behaviors of the rigid and flexible devices is mainly due to the effect of the substrate.

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Section: Resultssupporting

confidence: 60%

CuPc: Effects of its Doping and a Study of Its Organic-Semiconducting Properties for Application in Flexible Devices

et al. 2019

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“…Results shown in Table 2 were compared to those reported in the literature, regarding typical values for doped MPcs such as M = Ni, Cu, Co, Pb, Zn and falling in the ranges of SCLC behavior such as P 0 between 8 × 10 43 to 1.15 × 10 47 J −1 •m −3 and 6 × 10 20 to 9. [28]. SCLC behavior is corroborated by comparison of the results to those found in the literature.…”

Section: Device Characterizationsupporting

confidence: 72%

“…This process leads to the formation of a homogeneous material with a behavior resembling that of a p-n junction. DSMB's larger conductivity could be attributed to the formation of alternative paths for carrier conduction when doping a p-type organic semiconductor with TTF, as has been reported in previous studies [28]. On the other hand, DSMD's behavior could also be related to the fact that, as has been demonstrated in other studies, TCNQ doping of p-type semiconductors, such as Na 2 Pc, could turn them into n-type semiconductors [29] [30].…”

Section: Device Characterizationsupporting

confidence: 64%

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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“…3a-a ’). Previous studies also reported the broad peak at 2θ value less than 30° for the amorphous nature of chitosan 68 . The peak at 25.3° was absent in the diffraction spectra of pure CS while it can be observed in the patterns of nanocomposites of CS-TiO 2 (diff.…”

Section: Resultsmentioning

confidence: 76%

Chitosan-titanium oxide fibers supported zero-valent nanoparticles: Highly efficient and easily retrievable catalyst for the removal of organic pollutants

Ali

Khan

Kamal

et al. 2018

Sci Rep

132

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Different chitosan-titanium oxide (CS-TiO2-x, with x = TiO2 loadings of 1, 5, 10,15 and 20 wt%) nanocomposite fibers were prepared and kept separately in each salt solution of CuSO4, CoNO3, AgNO3 and NiSO4 to adsorb Cu2+, Co2+, Ag+, and Ni+ ions, respectively. The metal ions loaded onto CS-TiO2 fibers were reduced to their respective zero-valent metal nanoparticles (ZV-MNPs) like Cu0, Co0, Ag0 and Ni0 by treating with NaBH4. The CS-TiO2 fibers templated with various ZV-MNPs were characterized and investigated for their catalytic efficiency. Among all prepared ZV-MNPs, Cu0 nanoparticles templated on CS-TiO2-15 fibers exhibited high catalytic efficiency for the reduction of dyes (methyl orange (MO), congo red (CR), methylene blue (MB) and acridine orange (AO)) and nitrophenols (4-nitrohphenol (4-NP), 2-nitrophenol (2-NP), 3-nitrophenol (3-NP) and 2,6-dinitrophenol (2,6-DNP)). Besides the good catalytic activities of Cu/CS-TiO2-15 fibers, it could be easily recovered by simply pulling the fiber from the reaction medium.

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Optical and Electrical Properties of TTF-MPcs (M = Cu, Zn) Interfaces for Optoelectronic Applications

Cited by 18 publications

References 37 publications

CuPc: Effects of its Doping and a Study of Its Organic-Semiconducting Properties for Application in Flexible Devices

CuPc: Effects of its Doping and a Study of Its Organic-Semiconducting Properties for Application in Flexible Devices

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

Chitosan-titanium oxide fibers supported zero-valent nanoparticles: Highly efficient and easily retrievable catalyst for the removal of organic pollutants

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