Persistence in photoconductivity and optical property of nanostructured copper (II) phthalocyanine thin films

Karan, Santanu; Basak, Durga; Mallik, Biswanath

doi:10.1016/j.cap.2010.01.011

Cited by 17 publications

(12 citation statements)

References 38 publications

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“…Finally, the bands around 3308 and 3077 cm −1 correspond to the stretching vibrations for N–H, and the band around 1652 cm −1 corresponds to the C=O vibrations of the polymeric matrix. The crystalline structure of the MgPc is another variant that can be monitored by IR spectroscopy, due to its different polymorphs forms [ 33 , 34 , 35 , 36 , 37 ]. The MgPc α-form and the β-form can be identified by a band around 720 cm −1 and a band around 778 cm −1 , respectively [ 33 , 34 , 35 , 36 , 37 ].…”

Section: Resultsmentioning

confidence: 99%

“…These was done to verify the incorporation of semiconductor particles into the matrix and also to determine the crystalline form present in doped MgPc. The MgPc shows two main crystalline forms: alpha (α) and beta (β), which can be verified at 777 and 720 cm −1 , respectively [33,34,35,36,37]. Furthermore, to evaluate the effect of Nylon 11 on the semiconductor, doped MgPc and intrinsic thin films were deposited additionally.…”

Section: Methodsmentioning

confidence: 99%

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New Development of Membrane Base Optoelectronic Devices

et al. 2017

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It is known that one factor that affects the operation of optoelectronic devices is the effective protection of the semiconductor materials against environmental conditions. The permeation of atmospheric oxygen and water molecules into the device structure induces degradation of the electrodes and the semiconductor. As a result, in this communication we report the fabrication of semiconductor membranes consisting of Magnesium Phthalocyanine-allene (MgPc-allene) particles dispersed in Nylon 11 films. These membranes combine polymer properties with organic semiconductors properties and also provide a barrier effect for the atmospheric gas molecules. They were prepared by high vacuum evaporation and followed by thermal relaxation technique. For the characterization of the obtained membranes, Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS) were used to determine the chemical and microstructural properties. UV-ViS, null ellipsometry, and visible photoluminescence (PL) at room temperature were used to characterize the optoelectronic properties. These results were compared with those obtained for the organic semiconductors: MgPc-allene thin films. Additionally, semiconductor membranes devices have been prepared, and a study of the device electronic transport properties was conducted by measuring electrical current density-voltage (J-V) characteristics by four point probes with different wavelengths. The resistance properties against different environmental molecules are enhanced, maintaining their semiconductor functionality that makes them candidates for optoelectronic applications.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

New Development of Membrane Base Optoelectronic Devices

et al. 2017

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“…It is difficult to determine the crystalline arrangement from TEM imaging in real space, so a wider characterization by IR spectroscopy was required. IR spectroscopy was specifically used to identify the structural nature of FePc, given that the IR spectrum depends on the crystal structure [4]. MPcs are known to have different polymorphs which are strongly identified by the IR absorption technique [4,5].…”

Section: Resultsmentioning

confidence: 99%

“…IR spectroscopy was specifically used to identify the structural nature of FePc, given that the IR spectrum depends on the crystal structure [4]. MPcs are known to have different polymorphs which are strongly identified by the IR absorption technique [4,5]. It has been reported that the α-form of MPc can be characterized by a band around 720 cm −1 , while the β-form can be characterized by a band at a greater wave number at approximately 778 cm −1 [4][5][6][7].…”

Section: Resultsmentioning

confidence: 99%

Preparation and Structural Characterization of Metallophthalocyanine Particles Embedded in a Polymer Matrix

Sánchez-Vergara¹,

Ubeda²,

Ochoa³

et al. 2017

Phthalocyanines and Some Current Applications

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In this work, thin-film deposition of FePc particles nucleated and grown in gels was carried out in air by spin coating. The surface morphology and structure of these films were analysed by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The optical parameters have been investigated using spectrophotometric measurements of transmittance in the wavelength range of 200-1100 nm. The absorption spectra recorded in the UV-Vis region for the deposited samples showed a single band, namely the B or Soret band in the region between 285 and 305 nm. The dependence of the Tauc and Cody optical gaps associated with the thickness of the film was determined and found to be around 4.2 eV from direct transitions and 3.8 eV from non-direct transitions. The films' electric properties and their dependence in the presence of radiation of several wavelengths were evaluated. At lower voltages, ohmic conduction is evident, while space-charge limited conductivity (SCLC) governed by an exponential trap distribution is to be found at higher voltages.

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“…[ 13,14 ] This material with different nano/ micro structures highly influence the charge carrier injection and electrical transport process with other organic systems. [ 15 ] The films produced by different physical deposition techniques have a disadvantage, which is to lift off and place it over the actual device due to strong material‐ substrate interaction. From modern day perspective, freestanding flexible electronic devices are the future.…”

Section: Introductionmentioning

confidence: 99%

Copper (II) Phthalocyanine (CuPc) Based Optoelectronic Memory Device with Multilevel Resistive Switching for Neuromorphic Application

Das

Samanta

Sarkar

et al. 2021

Adv Elect Materials

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The 1D nanotubular organic semiconductor, copper (II) phthalocyanine (CuPc), embedded in poly‐methyl methacrylate (PMMA) is employed for the first time for multilevel resistive switching (RS) and neuromorphic applications. Single–double bonded planar CuPc tubes are synthesized via simple solvothermal methods and dispersed in the PMMA solution with different weight concentrations. The composite sample is deposited on an ITO coated transparent, flexible and conducting PET substrate to form Ag/CuPc@PMMA/ ITO device. I–V characterizations of the cell reveal a formation free, bipolar, non‐volatile, multilevel RS effect. The device shows a significantly large resistance ON/OFF ratio of 104, low threshold operating voltage (<2 V), large endurance (>104 cycles) and long retention time (>104 s) at room temperature. The multilevel resistive states are induced by visible light illumination. Based on the experimental data, the conduction mechanism of this type of RS memory device under the optical and the electrical impulse is attributed by the charge trapping and detrapping methods. The synaptic short‐term and long‐term potentiation are also studied on the device during the identical pulse training process. The proposed RS active material is a potential candidate for future artificial neural systems that simulate characteristics of human memory.

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Persistence in photoconductivity and optical property of nanostructured copper (II) phthalocyanine thin films

Cited by 17 publications

References 38 publications

New Development of Membrane Base Optoelectronic Devices

New Development of Membrane Base Optoelectronic Devices

Preparation and Structural Characterization of Metallophthalocyanine Particles Embedded in a Polymer Matrix

Copper (II) Phthalocyanine (CuPc) Based Optoelectronic Memory Device with Multilevel Resistive Switching for Neuromorphic Application

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