Effect of γ-radiation on the conduction mechanism of thermal vacuum deposited copper phthalocyanine thin films

Arshak, A.; Zleetni, S.M.; Arshak, K.; Harris, John A.

doi:10.1109/nano.2001.966426

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…The effects of -radiation on the absorbance bands, permittivity and conduction mechanisms of thermal vacuum deposited CuPc thin films were investigated [26]. Fig.…”

Section: B Dosimeters Based On Mepc Filmsmentioning

confidence: 99%

“…7 demonstrates the UV/visible absorbance spectra for as-deposited and -irradiated CuPc thin films. These are believed to result from the interaction of the ultraviolet and visible light with molecular orbitals in the configuration and also from the overlapping of electronic orbitals on the central copper atom [26]. Both B-and Q-absorbance bands experienced large rises when CuPc thin films were exposed to -rays.…”

Section: B Dosimeters Based On Mepc Filmsmentioning

confidence: 99%

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Thin and thick films of metal oxides and metal phthalocyanines as gamma radiation dosimeters

Arshak¹,

Arshak²,

Zleetni³

et al. 2004

IEEE Trans. Nucl. Sci.

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Numerous efforts were devoted to investigating the influence of radiation on metal oxides and polymer materials for dosimetry applications. Metal oxides, such as NiO, LaFeO 3 , CeO 2 , TeO 2 , In 2 O 3 , SiO and MnO, and polymers, such as CuPc, NiPc, MnPc and CoPc, were used as the active constituents in the fabrication of -radiation sensors. Thin and thick film devices were made in various topologies to form resistors, capacitors, pn-junctions and transistors. It was found that the properties of the active films (and, hence, their sensitivity to radiation) could be controlled by doping their constituent materials with carbon and mixing them in different proportions.The 60 Co and 137 Cs sources were used to expose the samples to -radiation. Current-voltage characteristics, optical absorption spectra, Raman spectra, SEM and XRD measurements were recorded for the samples after each exposure procedure and values of radiation damage were estimated.Thin film devices were found to be more sensitive to radiation than their thick film counterparts. Annealing was used to restore the properties of thick film devices after they were damaged with radiation. Thick films could be therefore reused on a repeatable basis, but thin film devices could not, as the heat treatments necessary for annealing were found to cause diffusion of the electrode materials.In this work, the possibility of fabricating a device that would satisfy the requirement of a particular application, such as sensitivity to -radiation and working dose region, was experimentally demonstrated. Based on the findings, these devices were found to provide a cost-effective alternative for room temperature real time -radiation dosimeter applications.Index Terms-Gamma radiation, metal oxides, metal phthalocyanines, MOS, optical and electrical properties, personal dosimeter, pn-junction, thin and thick films.

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“…The effects of -radiation on the absorbance bands, permittivity and conduction mechanisms of thermal vacuum deposited CuPc thin films were investigated [26]. Fig.…”

Section: B Dosimeters Based On Mepc Filmsmentioning

confidence: 99%

Section: B Dosimeters Based On Mepc Filmsmentioning

confidence: 99%

Thin and thick films of metal oxides and metal phthalocyanines as gamma radiation dosimeters

Arshak¹,

Arshak²,

Zleetni³

et al. 2004

IEEE Trans. Nucl. Sci.

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“…Metal-substituted and metal-free phthalocyanine polymers have recently attracted considerable interest due to their high thermal and chemical stability [1][2][3][4][5][6][7][8][9]. The most attractive property of the phthalocyanines is their similarity in structure to the two most important biological molecules; chlorophyll and haemoglobin [10].…”

Section: Introductionmentioning

confidence: 99%

γ-radiation Sensor Using Optical and Electrical Properties of Manganese Phthalocyanine (MnPc) Thick Film

Arshak

Zleetni

Arshak

2002

Sensors

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Manganese phthaloyanine polymer thick films were fabricated using screenprinting techniques. The optical parameters were obtained from the analysis of the absorption spectra over a wavelength range of 385-900nm. The d.c. electrical measurements were carried out in a range of 0-30 volts. The effects of γ-radiation on the optical and the electrical properties were investigated for dosimetry applications. The optical energy band gaps of these films showed a decrease in their values with the increase in the radiation dose. The electronic transition has changed from direct allowed for the as-printed films (unexposed to γ-rays) to indirect allowed for the irradiated samples. Both the as-printed and irradiated Ag/MnPc/Ag devices demonstrated a Schottky conduction mechanism. Both the absorbance and the capacitance of the MnPc thick films displayed a highly consistent linear response to γ-ray exposure.

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γ-radiation dosimeter using the optical and electrical properties of Al/S/CuPc/Al thin films

Arshak

Zleetni

Arshak

et al.

2002 23rd International Conference on Microelectronics. Proceedings (Cat. No.02TH8595)

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Effect of γ-radiation on the conduction mechanism of thermal vacuum deposited copper phthalocyanine thin films

Cited by 4 publications

References 11 publications

Thin and thick films of metal oxides and metal phthalocyanines as gamma radiation dosimeters

Thin and thick films of metal oxides and metal phthalocyanines as gamma radiation dosimeters

γ-radiation Sensor Using Optical and Electrical Properties of Manganese Phthalocyanine (MnPc) Thick Film

γ-radiation dosimeter using the optical and electrical properties of Al/S/CuPc/Al thin films

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