Ambipolar charge transport in non-peripherally substituted octahexyl zinc phthalocyanine

Chaure, Nandu B.; Barard, Seema; Ray, Asim K.; Cammidge, Andrew N.; Cook, Michael J.

doi:10.1209/0295-5075/104/57005

Cited by 8 publications

(4 citation statements)

References 26 publications

(20 reference statements)

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“…High drift motilities of up to 1.4 cm 2 V −1 s −1 and 0.5 cm 2 V −1 s −1 for both hole and electrons in the crystalline solid phase of (6PcH 2 ) were obtained at rt from the TOF measurement [26]. The mobility values of 8GdPc 2 are at least one order of magnitude higher than those reported for non-peripherally octahexyl substituted ambipolar zinc (ZnPc 6 ) phthalocyanine [27].…”

Section: Resultsmentioning

confidence: 77%

Newly synthesised gadolinium bis-phthalocyanine sandwich complex: ambipolar organic semiconductor

Barard

Kreouzis

Cammidge

et al. 2018

Semicond. Sci. Technol.

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Time of flight photocurrent transient studies on 5 μm thick solution processed films of novel non-peripherally octa-octyl-substituted liquid crystalline gadolinium bis-1,4,8,11,15,18,22,25octakis(octyl) phthalocyanines (8GdPc 2 ) provide a quantitative analysis of the intrinsic ambipolar charge transport relative to mesomorphic structure of this lanthanide compound. Characteristic liquid crystalline phases of these molecules have been identified from differential scanning calorimetry supported by observation from the UV-visible absorption, showing crystal-columnar mesophase and columnar mesophase-isotropic liquid transitions at 64.2 °C and 162 °C, respectively. The TOF carrier mobility is found to be structure dependent and highest values of 4.73×10 −6 m 2 V −1 s −1 and 1.6×10 −6 m 2 V −1 s −1 have been estimated for hole and electron mobilities for hexagonally packed, columnar structures of the spin-coated films. These results are exploitable for development of single molecule based all organic complimentary analogue and digital circuits with tunable field effect performance.

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Section: Resultsmentioning

confidence: 77%

Newly synthesised gadolinium bis-phthalocyanine sandwich complex: ambipolar organic semiconductor

Barard

Kreouzis

Cammidge

et al. 2018

Semicond. Sci. Technol.

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“…To find out the charge transport mechanism in ZnTTBPc–RGO, I – V characteristics have been recorded in the 88–320 K temperature range (the data for sample G are shown in Figure S5 in the Supporting Information). Pure ZnTTBPc shows a transition from crystal phase to liquid crystal mesophase at ∼335 K. , The I – V data in the mesophase are not stable which restricts us to take data up to 320 K. , The temperature ( T ) dependent resistance ( R ) of samples F, G, and H (Figure a) depicts decreasing nature with increasing temperature owing to semiconducting behavior . This nonlinear behavior of resistance follows the equation where R 0 is a prefactor, T 0 represents the characteristic temperature related to the energy needed for charge carrier hopping, and p is an exponent.…”

Section: Results and Discussionmentioning

confidence: 99%

Charge Transfer and Ultrafast Nonlinear Optical Properties above Percolation Threshold in Graphene-Induced ZnTTBPc

et al. 2020

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Electrically conducting matrix comprised of graphene and organic molecule is immensely versatile and has a broad range of potential applications. Highly soluble zinc tetra-tert-butyl phthalocyanine−reduced graphene oxide (ZnTTBPc−RGO) blend samples have been synthesized with different RGO concentrations (0−1 volume fraction). The electrical conductivity of ZnTTBPc−RGO samples indicates a percolating behavior with the three-dimensional percolation threshold of ∼0.167 vol. fraction of RGO. Room temperature as well as temperature dependent (100−320 K) photosensitivity (P) measurements go through a maximum at ∼0.33 vol. fraction of RGO content (namely sample G). Calculated P values exhibit a decreasing trend with increasing temperature and have been ascribed to enhanced scattering mechanisms. Resistivity data suggest that the charge transport process of ZnTTBPc− RGO is consistent with Efros−Shklovskii variable range hopping mechanism at 88−320 K. Moreover, comprehensive measurements on nonlinear absorption (NLA) of ZnTTBPc−RGO show a significant enhancement in nonlinear optical properties compared to pure ZnTTBPc when measured with ∼100 fs, 1 kHz laser pulse at 540 nm in an intensity range of 37−130 GW/cm 2 . Comparative measurements on P and NLA coefficient show highest values for sample G compared to others along with faster electron transfer rate, confirmed by femtosecond transient absorption spectroscopy measurements. These results provide a way of characterizing ZnTTBPc−RGO blend for optoelectronic device applications.

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“…This value is three orders of magnitude higher than one obtained for similar configured 2 μm thick 6ZnPc drop-cast films. 22 This relatively high mobility is attributed to the larger, well defined 6CuPc crystallites formed during slow cooling of the sample. For both bias voltages, the photo-current is found to have progressively decreased over time.…”

Section: Resultsmentioning

confidence: 99%

Electron Charge Transport in Non-Peripherally Substituted Copper Phthalocyanine

Chaure

Barard

Chambrier

et al. 2020

ECS J. Solid State Sci. Technol.

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Bottom-gate, bottom-contact organic thin film transistors (OTFTs) were fabricated using solvent soluble copper-1,4,8,11,15,18,22,25-octakis(hexyl)phthalocyanine as the active semiconductor layer. The compound was deposited as 70 nm thick spin-coated films onto gold source-drain electrodes supported on octadecyltrichlorosilane treated 250 nm thick SiO2 gate insulator. The analysis of experimental results showed the n-type field effect behaviour. Devices annealed at 100 oC under vacuum were found to exhibit the field-effect mobility of 0.0989 cm2 V−1 s−1, with an on/off current modulation ratio of ∼106, a reduced threshold voltage of 0.7 V and a sub-threshold swing of 2.12 V decade−1. The variations in surface morphology of the devices are found reflected considerably in the electrical measurements. The device contact resistance was found to be decreased as the gate bias increased and also with the annealing.

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Ambipolar charge transport in non-peripherally substituted octahexyl zinc phthalocyanine

Cited by 8 publications

References 26 publications

Newly synthesised gadolinium bis-phthalocyanine sandwich complex: ambipolar organic semiconductor

Newly synthesised gadolinium bis-phthalocyanine sandwich complex: ambipolar organic semiconductor

Charge Transfer and Ultrafast Nonlinear Optical Properties above Percolation Threshold in Graphene-Induced ZnTTBPc

Electron Charge Transport in Non-Peripherally Substituted Copper Phthalocyanine

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