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Electrical characterization of the organic semiconductor Ag/CuPc/Au Schottky diode

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Journal of Semiconductors 2011年第4期32卷 52-56页

作者： mutabar Shah m.H.Sayyad Kh.S.karimov Ghulam Ishaq Khan Institute of Engineering Sciences and Technology physical Technical Institute of Academy of Sciences

This paper reports on the fabrication and investigation of a surface-type organic semiconductor copper phthalocyanine（CuPc） based diode.A thin film of CuPc of thickness 100 nm was thermally sublimed onto a glass substrate with preliminary deposited metallic electrodes to form a surface-type Ag/CuPc/Au Schottky *** current-voltage characteristics were measured at room temperature under dark *** barrier height was calculated as 1.05 *** values of mobility and conductivity was found to be 1.74×10;cm;/（V·s） and 5.5×10;Ω;·cm;,*** low voltages the device showed ohmic conduction and the space charge limited current conduction mechanisms were dominated at higher voltages.

关键词： Schottky diode copper phthalocyanine thin film organic semiconductor mobility

Surface-type humidity sensor based on cellulose-PEPC for telemetry systems

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Journal of Semiconductors 2011年第1期32卷 103-107页

作者： Kh.S.karimov m.Saleem T.A.Qasuria m.Farooq GIK Institute of Engineering Sciences and Technology physical Technical Institute Aini St.299/1Dushanbe734063Tajikistan

Au/cellulose-PEPC/Au surface-type humidity sensors were fabricated by drop-casting cellulose and poly-N-epoxypropylcarbazole （PEPC） blend thin films. A blend of 2wt% of each cellulose and PEPC in benzol was used for the deposition of humidity sensing films. Blend films were deposited on glass substrates with preliminary deposited surface-type gold electrodes. Films of different thicknesses of cellulose and PEPC composite were deposited by drop-casting technique. A change in electrical resistance and capacitance of the fabricated devices was observed by increasing the relative humidity in the range of 0-95% RH. It was observed that the capacitances of the sensors increase, while their resistances decrease with increasing the relative humidity. The sensors were connected to op-amp square wave oscillators. It was observed that with increasing the relative humidity, the oscillator＇s frequencies were also increased in the range of 4.2-12.0 kHz for 65μm thick film sample, 4.1-9.0 kHz for 88μm thick film sample, and 4.2-9.0 kHz for 210μm sample. Effects of film thickness on the oscillator＇s frequency with respect to humidity were also investigated. This polymer humidity sensor controlled oscillator can be used for short-range and long-range remote systems at environmental monitoring and assessment of the humidity level.

关键词： surface-type sensor: cellulose poly-N-epoxvoropylcarbazole humidity sensor controlled oscillator

Effect of pressure on the electrical properties of flexible NiPc thin films fabricated by rubbing-in technology

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Chinese Physics B 2021年第1期30卷 328-331页

作者： Khasan S karimov Fahmi F muhammadsharif Zubair Ahmad m muqeet Rehman Rashid Ali GIK Institute of Engineering Sciences and Technology TopiDistrict SwabiKPK23640Pakistan Center for Innovative Development of Science and New Technologies of Academy of Sciences of Tajikistan Dushanbe734025 Department of Physics Faculty of Science and HealthKoya University44023 KoyaKurdistan Region-F.R.Iraq Center for Advanced materials(CAm) Qatar UniversityP.O.Box 2713DohaQatar Department of Electronic Engineering Jeju National UniversityJejuRepublic of Korea

Nickel phthalocyanine(Ni Pc) film was deposited onto the surface of flexible conductive glass by rubbing-in technology and used to fabricate devices based on ITO/Ni Pc/CNT/rubber structure. The I–V characteristics of the devices were investigated under different uniaxial pressures of 200, 280, and 480 gf/cm^(2), applied perpendicular to the surface of the Ni Pc film. Results showed that the nonlinearity coefficients of the I–V curves are in the range of 2 to 3, which was found to be decreased with the increase of the pressure. The rectification ratio of the devices was estimated to be varied from 1.5 to 3 based on the applied pressure. Concluding, the resistance of the active layers was decreased with the increase of both pressure and voltage. We believe that using the rubbing-in technology under sufficient applied pressure it is possible to utilize Ni Pc for the development of various electronic devices such as diodes, nonlinear resistors, and sensors.

关键词： pressure electrical property NiPc thin film rubbing-in technology

Optical sensors based on the NiPc-CoPc composite films deposited by drop casting and under the action of centrifugal force

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Chinese Physics B 2017年第6期26卷 114-118页

作者： Noshin Fatima muhammad m Ahmed Khasan S karimov Zubair Ahmad Fahmi Fariq muhammad Department of Electrical Engineering Capital University of Science and Technology (CUST) Islamabad 44000 Pakistan GIK Institute of Engineering Sciences and Technology Topi District Swabi KPK 23640 Pakistan Center for Innovative Development of Science and New Technologies of Academy of Sciences Aini 299/2 Dushanbe 734063 Tajikistan Center for Advanced materials (CAm) Qatar University P. O. Box 2713 Doha Qatar Center for Composites Institute for Vehicle Systems & Engineering Faculty of Mechanical Engineering Universiti Teknologi Malaysia 81310 Johor Bahru Johor Malaysia Soft materials & Devices Laboratory Department of Physics Faculty of Science and Health Koya University Danielle Mitten'and Boulevard Koya 45 Kurdistan Region Iraq

In this study, solution processed composite films of nickel phthalocyanine（NiPc） and cobalt phthalocyanine（CoPc）are deposited by drop casting and under centrifugal force. The films are deposited on surface-type inter-digitated silver electrodes on ceramic alumina substrates. The effects of illumination on the impedance and capacitance of the NiPc–CoPc composite samples are investigated. The samples deposited under centrifugal force show better conductivity than the samples deposited by drop casting technique. In terms of impedance and capacitance sensitivities the samples fabricated under centrifugal force are more sensitive than the drop casting samples. The values of impedance sensitivity（Sz）are equal to（-1.83） mΩ·cm^2/mW and（-5.365） mΩ·cm^2/mW for the samples fabricated using drop casting and under centrifugal force, respectively. Similarly, the values of capacitance sensitivity（Sc） are equal to 0.083 pF·cm^2/mW and 0.185 pF·cm～2/mW for the samples fabricated by drop casting and under centrifugal force. The films deposited using the different procedures could potentially be viable for different operational modes（i.e., conductive or capacitive） of the optical sensors. Both experimental and simulated results are discussed.

关键词： optical sensors capacitive mode impedance mode centrifugal deposition

Novel pressure and displacement sensors based on carbon nanotubes

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Chinese Physics B 2015年第1期24卷 560-563页

作者： Kh.S.karimov Khaulah Sulaiman Zubair Ahmad Khakim m.Akhmedov A.mateen GIK Institute of Engineering Sciences and Technology Topi District Swabi KPK 23640 Pakistan Physical Technical Institute of Academy of Sciences Rudaki Ave. 33 Dushanbe 734025 Tajikistan Low Dimensional materials Research Centre (LDmRC) Department of Physics Faculty of Science University of Malaya 50603 Kuala Lumpur Malaysia Center for Innovative Development of Science and New Technologies of Academy of Sciences Rudaki Ave. 33 Dushanbe 734025 Tajikistan Faculty of materials Science and Engineering Institute of Space Technology Islamabad 44000 Pakistan

We report newly designed pressure and displacement capacitive sensors based on a flexible paper–CNT *** carbon nanotube（CNT） powder was deposited on a thin paper substrate and was pressed at an elevated *** sheet resistance of the paper–CNT films was in the range of 2–4 kΩ/cm^2. The paper–CNT films were used to fabricate pressure and displacement sensors. The sensitivities of the pressure and the displacement sensors were found to be17.3 p F·m^2/k N and 0.93 10-3p F/μm, respectively. The experimental results were compared with the simulated data and they found good agreement with each other.

关键词： carbon nanotube sensors composite capacitance

Development of magnesium-Dominant Soils Under Irrigated Agriculture in Southern Kazakhstan

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Pedosphere 2009年第3期19卷 331-343页

作者： A. karimov m. QADIR A. NOBLE F. VYSHPOLSKY K. ANZELm International Water management Institute (IWmI) Central Asia Regional Office Tashkent 700000 (Uzbekistan) International Center for Agricultural Research in the Dry Areas (ICARDA) Aleppo 5466 (Syria) International Water management Institute (IWmI) Colombo 2075 (Sri Lanka) International Water management Institute (IWmI) c/o WorldFish Center Penang 11960 (Malaysia) Water Conservation Laboratory The Kazakh Research Institute of Water Management Ministry of Agriculture Taraz480022 (Kazakhstan) Southern Kazakhstan Hydrogeology and Land Reclamation Expedition Shymkent (Kazakhstan)

Irrational irrigation practices in the Arys Turkestan Canal command area in the southern part of Kazakhstan have led to the formation of soils with poor physical and chemical properties. To study whether irrigation and leaching practices and/or groundwater rise have contributed to the accumulation of mg2+ on the cation exchange complex of these soils, historical changes in soil and groundwater quality were used as source data and the Visual mINTEQ model was applied to analyze the chemical composition of water and soils in the study area. The imposed irrigation regime and the leaching of light sierosem soils led to the dissolution and subsequent leaching of inherent gypsum and organic matter from the soil profile. Further, the domination of bicarbonate in the irrigation water promoted weathering of the carbonate minerals present as calcite. The higher concentrations of mg2+ in comparison to Ca2+ in the irrigation water resulted in the replacement of Na+ by mg2+ on the cation exchange complex. In the lower part of the command area, shallow groundwater has contributed to the accumulation of Na+ and to a large extent of mg2+ on the cation exchange sites.

关键词： exchangeable magnesium high-magnesium soil and water Kazakhstan land degradation

Ag/PEPC/NiPc/ZnO/Ag thin film capacitive and resistive humidity sensors

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Journal of Semiconductors 2010年第5期31卷 45-50页

作者： Kh.S.karimov Kuan Yew Cheong m.Saleem Imran murtaza m.Farooq Ahmad Fauzi mohd Noor GIK Institute of Engineering Sciences and Technology TopiDistrict SwabiNWFP 23640Pakistan Physical Technical Institute of Academy of Sciences Rudaki Ave 33Dushanbe734025Tajikistan School of materials & mineral Resources Engineering Engineering CampusUniversiti Sains Malaysia14300 Nibong TebalPenangMalaysia

A thin film of blended poly-N-epoxypropylcarbazole（PEPC）（25 wt.%）,nickel phthalocyanine（NiPc）（50 wt.%） and ZnO nano-powder（25 wt.%） in benzene（5 wt.%） was spin-coated on a glass substrate with silver electrodes to produce a surface-type Ag/PEPC/NiPc/ZnO/Ag capacitive and resistive *** with two different PEPC/NiPc/ZnO film thicknesses（330 and 400 nm） were fabricated and *** effects of humidity on capacitance and resistance of the Ag/PEPC/NiPc/ZnO/Ag sensors were investigated at two frequencies of the applied voltage：120 Hz and 1 *** was observed that at 120 Hz under humidity of up to 95%RH the capacitance of the sensors increased by 540 times and resistance decreased by 450 times with respect to humidity conditions of 50%RH. It was found that the sensor with a thinner semiconducting film（330 nm） was more sensitive than the sensor with a thicker film（400 nm）.The sensitivity was improved when the sensor was used at a lower frequency as compared with a high *** is assumed that the humidity response of the sensors is associated with absorption of water vapors and doping of water molecules in the semiconductor blend *** had been proven by simulation of the capacitance-humidity relationship.

关键词： organic semiconductor poly-N-epoxypropylcarbazole nickel phthalocyanine nano-powder ZnO sensor

Characterization of vanadyl phthalocyanine based surface-type capacitive humidity sensors

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Journal of Semiconductors 2010年第11期31卷 9-14页

作者： Fakhra Aziz m.H.Sayyad Khassan S.karimov m.Saleem Zubair Ahmad S.mahmood Khan Ghulam Ishaq Khan Institute of Engineering Sciences and Technology Topi-23640Pakistan Low Dimensional material Research Center Department of PhysicsUniversity of Malaya50603 Kuala LumpurMalaysia Physical Technical Institute Aini St-299/1Dushanbe734063Tajikistan Department of mechanical Engineering 20 Symonds Street AucklandUniversity of AucklandNew Zealand

This study presents the fabrication and characterization of novel surface-type capacitive humidity sensors using vanadyl phthalocyanine（VOPc） as the active *** devices,which comprise three different thicknesses, have been fabricated using the thermal evaporation technique.A thin film of VOPc is deposited on thoroughly cleaned glass substrates with pre-patterned Ag *** capacitive effect of the samples under humidity has been investigated. Comparison of the samples with different thicknesses shows that the thinnest device seems more sensitive towards *** humidity dependent capacitance properties of the sensor make it beneficial for use in commercial hygrometers.

关键词： surface-type capacitance vanadyl phthalocyanine humidity sensor organic semiconductor

Optical transmission in thin films of vanadium compounds

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Journal of Semiconductors 2014年第7期35卷 10-14页

作者： Kh.S.karimov m.mahroof-Tahir m.Saleem N.Ahmad A.Rashid GIK Institute of Engineering Sciences and Technology TopiDistrict SwabiKPK 23640Pakistan Physical Technical Institute of Academy of Sciences Rudaki Ave33Dushanbe 734025Tajikistan Saint Cloud State University 720 Fourth Avenue SouthSaint CloudMN 56301-4498USA Government College of Science Wahdat RoadLahore 54570Pakistan

Thin films of five vanadium compounds/composite：（1） VO2（3-fl）（3-fl = 3-Hydroxyflavone）, （2） VO（pbd）：（pbd = 1-Phenyl-l, 3-butadione）, （3） VO（dbm）2 （dbm = Dibenzoylmethane）, （4） VPc （Vanadyl Phthalocyanine） and （5） V2O5-PEPC （V2O5- poly-N-epoxypropylcarbazole composite）, were deposited by the dropcasting method from the solution in benzene. The transmittance-irradiance relationships were investigated and the transmission in the visible spectrum and optical images were obtained as well. It was found that the transmittance of the VO2（3-fl）, VO（pbd）2, VO（dbm）2 and VPc, was practically independent of the irradiance; whereas the transmittance of V2O5-PEPC decreased by 4% for thin and 9% for thick films with an increase of the irradiance.

关键词： vanadium compound/composite semiconductor thin film transmittance irradiance