Dr Maxim Shkunov
Lecturer in Nano Electronics, Postgraduate Admissions Tutor
Email: m.shkunov@surrey.ac.uk
Phone: Work: 01483 68 6082
Room no: 15 ATI 02
Further information
Biography
Maxim Shkunov studied physics and applied mathematics at Moscow Institute of Physics and Technology and trained at Russian Academy of Sciences (Moscow) prior to receiving his PhD in condensed matter physics from the University of Utah, USA, where he conducted research in ultrafast spectroscopy and laser action in conjugated polymers, microcavities and photonic crystals. He has since developed and evolved his research to encompass charge transport phenomena in organic semiconductors, plastic field-effect transistors, self-assembly at organic/inorganic interfaces, self-organisation with pi-conjugated liquid crystals and polymers, semiconducting nanowires, solution processable nanowire electronics and organic-inorganic hybrid devices. He has over 19 years of experience in the field and worked at Cavendish Laboratory (U. Cambridge) and Merck Chemicals (UK). Maxim (co)-authored more than 90 publications, including articles in peer reviewed journals, book chapter and patents. He is now a Lecturer in Nanoelectronics at the Advanced Technology Institute with a range of research, teaching, and administrative duties.
Further details can be found on personal web page.
Publications
Highlights
- . (2009) 'Semiconducting Thienothiophene Copolymers: Design, Synthesis, Morphology, and Performance in Thin-Film Organic Transistors'. WILEY-V C H VERLAG GMBH ADVANCED MATERIALS, 21 (10-11), pp. 1091-1109.
Journal articles
- . (2012) 'Spectroscopic and morphological investigation of conjugated photopolymerisable quinquethiophene liquid crystals'. Current Applied Physics, 12 (SUPPL. 1)
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(2012) 'Heavy metallic oxide nanoparticles for enhanced sensitivity in semiconducting polymer x-ray detectors'. IOP Publishing Nanotechnology, 23 (23) Article number 235502 Full text is available at: http://epubs.surrey.ac.uk/605295/
Abstract
Semiconducting polymers have previously been used as the transduction material in x-ray dosimeters, but these devices have a rather low detection sensitivity because of the low x-ray attenuation efficiency of the organic active layer. Here, we demonstrate a way to overcome this limitation through the introduction of high density nanoparticles having a high atomic number (Z) to increase the x-ray attenuation. Specifically, bismuth oxide (Bi O ) nanoparticles (Z=83 for Bi) are added to a poly(triarylamine) (PTAA) semiconducting polymer in the active layer of an x-ray detector. Scanning electron microscopy (SEM) reveals that the Bi O nanoparticles are reasonably distributed in the PTAA active layer. The reverse bias dc currentvoltage characteristics for PTAABi O diodes (with indium tin oxide (ITO) and Al contacts) have similar leakage currents to ITO/PTAA/Al diodes. Upon irradiation with 17.5keV x-ray beams, a PTAA device containing 60wt% Bi O nanoparticles demonstrates a sensitivity increase of approximately 2.5 times compared to the plain PTAA sensor. These results indicate that the addition of high-Z nanoparticles improves the performance of the dosimeters by increasing the x-ray stopping power of the active volume of the diode. Because the Bi O has a high density, it can be used very efficiently, achieving a high weight fraction with a low volume fraction of nanoparticles. The mechanical flexibility of the polymer is not sacrificed when the inorganic nanoparticles are incorporated. © 2012 IOP Publishing Ltd.
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(2011) 'High charge-carrier mobilities in blends of poly(triarylamine) and TIPS-pentacene leading to better performing X-ray sensors'. Organic Electronics: physics, materials, applications, 12 (11), pp. 1903-1908.Full text is available at: http://epubs.surrey.ac.uk/7284/
Abstract
A new class of X-ray sensor - in which there is a blend of poly(triarylamine) (PTAA) and 6,13-bis(triisopropylsilylethynyl) (TIPS)-pentacene in the active layer of a diode structure - has been developed. The crystalline pentacene provides a fast route for charge carriers and leads to enhanced performance of the sensor. The first time-of-flight charge-carrier mobility measurement of this blend is reported. The mobility of PTAA and TIPS-pentacene in a 1:25 molar ratio was found to be 2.2 × 10 cm V s (averaged for field strengths between 3 × 10 and 4 × 10 V cm ), which is about 17 times higher than that obtained in PTAA over the same range of field strengths. This higher mobility is correlated with a fourfold increase in the X-ray detection sensitivity in the PTAA:TIPS-pentacene devices. © 2011 Elsevier B.V. All rights reserved.
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(2011) 'The incorporation of mono- and bi-functionalized multiwall carbon nanotubes in organic photovoltaic cells.'. Nanotechnology, England: 22 (26)Full text is available at: http://epubs.surrey.ac.uk/3011/
Abstract
We have successfully prepared mono- and bi-functionalized multiwall carbon nanotubes (MWCNT) with thiophene, amine and thiophene-amine groups. The dispersion of nanotubes has been enhanced and stable optimized dispersions in organic solvents were obtained. These functionalized nanotubes have been successfully incorporated into bulk heterojunction (BHJ) organic photovoltaic (OPV) cells with a poly (3-hexyl thiophene) (P3HT) and [6, 6]-phenyl-C(61)-butyric acid methyl ester (PCBM) photoactive blended layer. The incorporation of MWCNT with different functional groups, in the active layer, results in different cell performance with respect to a reference cell. A maximum power conversion efficiency of 2.5% is achieved with the inclusion of thiophene functionalized nanotubes. This improvement in the device performance is attributed to an extension of the exciton dissociation volume and charge transport properties through the nanotube percolation network in P3HT/CNT, PCBM/CNT or both phases. This is believed to be due to more efficient dispersion of the functionalized nanotubes within the photoactive composite layer.
- . (2011) 'Structural and electrical characterization of ZnO films grown by spray pyrolysis and their application in thin-film transistors'. Advanced Functional Materials, 21 (3), pp. 525-531.
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(2011) 'Solution processable nanowire field-effect transistors'. Materials Research Society Symposium Proceedings, 1287, pp. 69-74.Full text is available at: http://epubs.surrey.ac.uk/715281/
Abstract
Hybrid field-effect-transistors (FETs) with germanium nanowire (NW) arrays and organic gate dielectric are presented. The nanowire deposition steps are fully compatible with printed electronics route. NW FETs demonstrate good performance with On/Off ratios of ~10 and hole mobilities of ∼13 cm /Vs in both nitrogen and air atmosphere. These results suggest that the hybrid nanowire FETs could be used in large area inexpensive electronics. © 2011 Materials Research Society.
- . (2011) 'Spectroscopic and morphological investigation of conjugated photopolymerisable quinquethiophene liquid crystals'. Current Applied Physics,
- . (2010) 'Spray-Deposited Li-Doped ZnO Transistors with Electron Mobility Exceeding 50 cm(2)/Vs'. WILEY-BLACKWELL ADVANCED MATERIALS, 22 (42), pp. 4764-+.
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(2010) 'Achieving a Stable Time Response in Polymeric Radiation Sensors under Charge Injection by X-rays'. AMER CHEMICAL SOC ACS APPLIED MATERIALS & INTERFACES, 2 (6), pp. 1692-1699.doi: 10.1021/am100220yFull text is available at: http://epubs.surrey.ac.uk/2962/
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(2010) 'Stability of top- and bottom-gate amorphous polymer field-effect transistors'. AMER INST PHYSICS APPLIED PHYSICS LETTERS, 97 (24) Article number ARTN 243507 doi: 10.1063/1.3525933Full text is available at: http://epubs.surrey.ac.uk/715282/
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(2009) 'Characterization of thick film poly(triarylamine) semiconductor diodes for direct x-ray detection'. AMER INST PHYSICS JOURNAL OF APPLIED PHYSICS, 106 (6) Article number ARTN 064513 doi: 10.1063/1.3225909Full text is available at: http://epubs.surrey.ac.uk/712273/
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(2009) 'Amorphous carbon and carbon nitride bottom gate thin film transistors'. AMER INST PHYSICS APPLIED PHYSICS LETTERS, 95 (10) Article number ARTN 102102 doi: 10.1063/1.3224834
- . (2009) 'Semiconducting Thienothiophene Copolymers: Design, Synthesis, Morphology, and Performance in Thin-Film Organic Transistors'. WILEY-V C H VERLAG GMBH ADVANCED MATERIALS, 21 (10-11), pp. 1091-1109.
- . (2009) 'Solid-State Supramolecular Organization of Polythiophene Chains Containing Thienothiophene Units'. WILEY-V C H VERLAG GMBH ADVANCED MATERIALS, 21 (10-11), pp. 1193-1198.
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(2009) 'Separate charge transport pathways determined by the time of flight method in bimodal polytriarylamine'. AMER INST PHYSICS JOURNAL OF APPLIED PHYSICS, 105 (1) Article number ARTN 013701 doi: 10.1063/1.3054180
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(2008) 'Organic field-effect transistors of poly(2,5-bis(3-dodecylthiophen-2-yl)thieno[2,3-b] thiophene) deposited on five different silane self-assembled monolayers'. ROYAL SOC CHEMISTRY CHEMICAL COMMUNICATIONS, (7), pp. 871-873.doi: 10.1039/b715536k
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(2007) 'Electronic structure and charge-transport properties of polythiophene chains containing thienothiophene units: A joint experimental and theoretical study'. AMER CHEMICAL SOC CHEMISTRY OF MATERIALS, 19 (20), pp. 4949-4956.doi: 10.1021/cm071279m
- . (2007) 'A study of the effects metal residues in poly(9,9-dioctylfluorene) have on field-effect transistor device characteristics'. ELSEVIER SCIENCE SA SYNTHETIC METALS, 157 (21), pp. 872-875.
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(2007) 'A comprehensive study of the effect of reactive end groups on the charge carrier transport within polymerized and nonpolymerized liquid crystals'. AMER INST PHYSICS JOURNAL OF APPLIED PHYSICS, 101 (2) Article number ARTN 023713 doi: 10.1063/1.2432045Full text is available at: http://epubs.surrey.ac.uk/261/
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(2007) 'The synthesis of robust, polymeric hole-transport materials from oligoarylamine substituted styrenes'. ROYAL SOC CHEMISTRY JOURNAL OF MATERIALS CHEMISTRY, 17 (20), pp. 2088-2094.doi: 10.1039/b614235d
- . (2006) 'Designing solution-processable air-stable liquid crystalline crosslinkable semiconductors.'. Philos Transact A Math Phys Eng Sci, England: 364 (1847), pp. 2779-2787.
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(2006) 'Liquid-crystalline semiconducting polymers with high charge-carrier mobility.'. Nat Mater, England: 5 (4), pp. 328-333.doi: 10.1038/nmat1612
- . (2006) 'Liquid crystal semiconductors and their application in field effect transistors'. SID Conference Record of the International Display Research Conference, , pp. 104-107.
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(2005) 'Thiophene and selenophene copolymers incorporating fluorinated phenylene units in the main chain: Synthesis, characterization, and application in organic field-effect transistors'. AMER CHEMICAL SOC CHEMISTRY OF MATERIALS, 17 (26), pp. 6567-6578.doi: 10.1021/cm051563i
Conference papers
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(2009) 'Flexible radiation dosimeters incorporating semiconducting polymer thick films'. Proceedings of SPIE - The International Society for Optical Engineering, 7449doi: 10.1117/12.829619Full text is available at: http://epubs.surrey.ac.uk/736487/
Abstract
Flexible radiation dosimeters have been produced incorporating thick films (>1 μm) of the semiconducting polymer poly([9,9-dioctylfluorenyl-2,7-diyl] -co-bithiophene). Diode structures produced on aluminium-metallised poly(imide) substrates, and with gold top contacts, have been examined with respect to their electrical properties. The results suggest that a Schottky conduction mechanism occurs in the reverse biased diode, with a barrier to charge injection at the aluminium electrode. Optical absorption/emission spectra reveal a band gap of 2.48 eV for the polymer. The diodes have been used for direct charge detection of 17 keV X-rays, generated by a molybdenum source. Using operating voltages of -10 and -50 V respectively, sensitivities of 54 and 158 nC/mGy/cm have been achieved. Increasing the operating voltage shows that the diodes are stable up to approximately -200 V without significant increase in the dark current of the device (<0.2 nA). © 2009 Copyright SPIE - The International Society for Optical Engineering.
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(2008) 'Electrical properties of reactive liquid crystal semiconductors'. JAPAN SOC APPLIED PHYSICS JAPANESE JOURNAL OF APPLIED PHYSICS, Nagano, JAPAN: International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies 47 (1), pp. 488-491.doi: 10.1143/JJAP.47.488
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(2006) 'The influence of molecular weight on the microstructure and thin film transistor characteristics of pBTTT polymers.'. SPIE-INT SOC OPTICAL ENGINEERING ORGANIC FIELD-EFFECT TRANSISTORS V, San Diego, CA: Conference on Organic Field-Effect Transistors V 6336doi: 10.1117/12.682874
- . (2005) 'Designing air stable thiophene polymers based on control of conjugation length.'. AMER CHEMICAL SOC ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, San Diego, CA: 229th National Meeting of the American-Chemical-Society 229, pp. U1148-U1148.
Book chapters
- . (2010) 'Polymerizable Liquid Crystal Networks for Semiconductor Applications'. in Crawwford GP, Broer D, Žumer S (eds.) Cross-Linked Liquid Crystalline Systems: From Rigid Polymer Networks to Elastomers CRC
Teaching
Molecular Electronics (MSc)
Frontiers of Nanotechnology / Energy (MSc)
Electronic and Photonic Devices (Level 2)
Final year projects (Level 3)
MSc projects
Departmental Duties
Prizes Officer for EE
International Committee member for FEPS
