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Materials Research Institute

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Dr Theo Kreouzis

Senior Lecturer

Department School of Physics and Astronomy
 G O Jones 115, Mile End
Telephone +44 (0)20 7882 3432
Email t.kreouzis@qmul.ac.uk
Homepage http://ph.qmul.ac.uk/directory/t.kreouzis

Research Keywords

Organic semiconductors, Devices, Charge transport, Magnetoresistance

Research Interests

Charge transport in organic semiconductors. Mobility measurements by Time of Flight, Dark Injection transients and by j-V and Field Effect Transistor characterisation. Magnetoresistance in organic compounds and magnetic effects on efficiency, current and charge carrier mobility. Photovoltaic action using organics.

 

Key Publications

Nuccio L, Willis M, Schulz L, Fratini S, Messina F, D'Amico M, Pratt FL, Lord JS, McKenzie I, Loth M, Purushothaman B, Anthony J, Heeney M, Wilson RM, Hern├índez I, Cannas M, Sedlak K, Kreouzis T, Gillin WP and Bernhard C (2013). Importance of spin-orbit interaction for the electron spin relaxation in organic semiconductors. Phys Rev Lett  vol. 110, (21) 10.1103/PhysRevLett.110.216602

Khademi S, Song JY, Wyatt PB, Kreouzis T and Gillin WP (2012). Ambipolar charge transport in traditional organic hole transport layers. Adv Mater  vol. 24, (17) 2278-2283. 10.1002/adma.201103830

Schulz L, Nuccio L, Willis M, Desai P, Shakya P, Kreouzis T, Malik VK, Bernhard C, Pratt FL, Morley NA, Suter A, Nieuwenhuys GJ, Prokscha T, Morenzoni E, Gillin WP and Drew AJ (2011). Engineering spin propagation across a hybrid organic/inorganic interface using a polar layer. Nat Mater  vol. 10, (1) 39-44. 10.1038/nmat2912

Gillin WP, Zhang SJ, Rolfe NJ, Desai P, Shakya P, Drew AJ and Kreouzis T (2010). Determining the influence of excited states on current transport in organic light emitting diodes using magnetic field perturbation. Phys Rev B  vol. 82, (19) 10.1103/PhysRevB.82.195208

Song JY, Stingelin N, Drew AJ, Kreouzis T and Gillin WP (2010). Effect of excited states and applied magnetic fields on the measured hole mobility in an organic semiconductor. Phys Rev B  vol. 82, (8) 10.1103/PhysRevB.82.085205

2017

DONNAN RS, Sushko O, Dubrovka R, Pigeon M, Kreouzis T and Parini C (2017). Comparative Study of Sub-THz FSS Filters Fabricated by Inkjet Printing, Microprecision Material Printing, and Photolithography. Ieee  Ieee Transactions On Terahertz Science and Technology  vol. 7, (2) 184-190. 10.1109/TTHZ.2017.2662582

2016

Gu H, Chang S, Lu H, Holford DF, Zhang T, Hu J, Gillin WP and Kreouzis T (2016). Impurity effects on charge transport and magnetoconductance in a single layer poly(3-hexyl-thiophene) device. Applied Physics Letters  vol. 108, (20) 203301-203301. 10.1063/1.4950859

GILLIN WP, Zhang T, holford DF, Gu H, Kreouzis T and zhang S (2016). Hole-exciton interaction induced high field decay of magneto-electroluminescence in Alq3-based organic light-emitting diodes at room temperature. American Institute of Physics (Aip)  Applied Physics Letters  vol. 108, 10.1063/1.4939871

2015

Gu H, Chang S, Holford D, Zhang T, Lu H, Kreouzis T and Gillin WP (2015). Annealing and doping-dependent magnetoresistance in single layer poly(3-hexyl-thiophene) organic semiconductor device. Organic Electronics: Physics, Materials, Applications  vol. 17, 51-56. 10.1016/j.orgel.2014.11.019

2014

Zhang HT, Han S, Desai P, Zhan YQ, Li W, Si W, Scott K, Drew AJ, Gillin WP, Zhang SJ and Kreouzis T (2014). Ferromagnetic-organic interfacial states and their role on low voltage current injection in tris-8-hydroxyquinloline (Alq3) organic spin valves. Applied Physics Letters  vol. 105, (20) 10.1063/1.4902539

Gu H, Kreouzis T and Gillin WP (2014). The transition from bipolaron to triplet-polaron magnetoresistance in a single layer organic semiconductor device. Organic Electronics  vol. 15, (8) 1711-1716. 10.1016/j.orgel.2014.04.036

Zhang S, Willis M, Gotto R, Roy KA, Rolfe NJ, Kreouzis T and Gillin WP (2014). Understanding the role of electron and hole trions on current transport in aluminium tris(8-hydroxyquinoline) using organic magnetoresistance. Applied Physics Letters  vol. 104, (4) 10.1063/1.4863684

Zhang H, Desai P, Zhan YQ, Drew AJ, Gillin WP and Kreouzis T (2014). The importance of holes in aluminium tris-8-hydroxyquinoline (Alq(3)) devices with Fe and NiFe contacts. Applied Physics Letters  vol. 104, (1) 10.1063/1.4861120

2013

Zhang S, Kreouzis T and Gillin WP (2013). Low temperature magnetic field effects on the efficiency of aluminium tris(8-hydroxyquinoline) based organic light emitting diodes in the absence of magnetoresistance. Synthetic Metals  vol. 173, 46-50. 10.1016/j.synthmet.2012.11.016

Nuccio L, Willis M, Schulz L, Fratini S, Messina F, D'Amico M, Pratt FL, Lord JS, McKenzie I, Loth M, Purushothaman B, Anthony J, Heeney M, Wilson RM, Hern├índez I, Cannas M, Sedlak K, Kreouzis T, Gillin WP and Bernhard C (2013). Importance of spin-orbit interaction for the electron spin relaxation in organic semiconductors. Phys Rev Lett  vol. 110, (21) 10.1103/PhysRevLett.110.216602

2012

Kreouzis T and Whitehead KS (2012). Charge transport in Reactive Mesogens and Liquid Crystal Polymer networks. Liquid Crystalline Semiconductors: Materials, Properties and Applications , Editors: Kelly SM, O'Neill M and Bushby R. Springer Verlag 

Zhang S, Rolfe NJ, Desai P, Shakya P, Drew AJ, Kreouzis T and Gillin WP (2012). Modeling of positive and negative organic magnetoresistance in organic light-emitting diodes. Physical Review B  vol. 86, (7) 10.1103/PhysRevB.86.075206

Khademi S, Song JY, Wyatt PB, Kreouzis T and Gillin WP (2012). Ambipolar charge transport in traditional organic hole transport layers. Adv Mater  vol. 24, (17) 2278-2283. 10.1002/adma.201103830

Chaure NB, Pal C, Barard S, Kreouzis T, Ray AK, Cammidge AN, Chambrier I, Cook MJ, Murphy CE and Cain MG (2012). A liquid crystalline copper phthalocyanine derivative for high performance organic thin film transistors. Journal of Materials Chemistry  vol. 22, (36) 19179-19189. 10.1039/c2jm33301e

2011

Schulz L, Willis M, Nuccio L, Shusharov P, Fratini S, Pratt FL, Gillin WP, Kreouzis T, Heeney M, Stingelin N, Stafford CA, Beesley DJ, Bernhard C, Anthony JE, McKenzie I, Lord JS and Drew AJ (2011). Importance of intramolecular electron spin relaxation in small molecule semiconductors. Phys Rev B  vol. 84, (8) 10.1103/PhysRevB.84.085209

Muller C, Zhigadlo ND, Kumar A, Baklar MA, Karpinski J, Smith P, Kreouzis T and Stingelin N (2011). Enhanced Charge-Carrier Mobility in High-Pressure-Crystallized Poly(3-hexylthiophene). Macromolecules  vol. 44, (6) 1221-1225. 10.1021/ma102529f

Schulz L, Nuccio L, Willis M, Desai P, Shakya P, Kreouzis T, Malik VK, Bernhard C, Pratt FL, Morley NA, Suter A, Nieuwenhuys GJ, Prokscha T, Morenzoni E, Gillin WP and Drew AJ (2011). Engineering spin propagation across a hybrid organic/inorganic interface using a polar layer. Nat Mater  vol. 10, (3) 10.1038/nmat2962

Schulz L, Nuccio L, Willis M, Desai P, Shakya P, Kreouzis T, Malik VK, Bernhard C, Pratt FL, Morley NA, Suter A, Nieuwenhuys GJ, Prokscha T, Morenzoni E, Gillin WP and Drew AJ (2011). Engineering spin propagation across a hybrid organic/inorganic interface using a polar layer. Nat Mater  vol. 10, (1) 39-44. 10.1038/nmat2912

2010

Gillin WP, Zhang SJ, Rolfe NJ, Desai P, Shakya P, Drew AJ and Kreouzis T (2010). Determining the influence of excited states on current transport in organic light emitting diodes using magnetic field perturbation. Phys Rev B  vol. 82, (19) 10.1103/PhysRevB.82.195208

Baklar MA, Koch F, Kumar A, Domingo EB, Campoy-Quiles M, Feldman K, Yu L, Wobkenberg P, Ball J, Wilson RM, McCulloch I, Kreouzis T, Heeney M, Anthopoulos T, Smith P and Stingelin N (2010). Solid-state processing of organic semiconductors. Adv Mater  vol. 22, (35) 3942-3947. 10.1002/adma.200904448

Song JY, Stingelin N, Drew AJ, Kreouzis T and Gillin WP (2010). Effect of excited states and applied magnetic fields on the measured hole mobility in an organic semiconductor. Phys Rev B  vol. 82, (8) 10.1103/PhysRevB.82.085205

Dhandapani D, Morley NA, Gibbs MRJ, Kreouzis T, Shakya P, Desai P and Gillin WP (2010). The Effect of Injection Layers on a Room Temperature Organic Spin Valve. Ieee T Magn  vol. 46, (6) 1307-1310. 10.1109/TMAG.2010.2043818

KREOUZIS T (2010). Cross-Linked Liquid Crystalline Systems: From Rigid Polymer Networks to Elastomers. Cross-Linked Liquid Crystalline Systems: From Rigid Polymer Networks to Elastomers , Editors: Crawford GP, Broer D and Zumer S. Crc 

McCairn MC, Kreouzis T and Turner ML (2010). Microwave accelerated synthesis and evaluation of conjugated oligomers based on 2,5-di-thiophene-[1,3,4]thiadiazole. J Mater Chem  vol. 20, (10) 1999-2006. 10.1039/b922714h

Baklar M, Barard S, Sparrowe D, Wilson RM, McCulloch I, Heeney M, Kreouzis T and Stingelin N (2010). Bulk charge transport in liquid-crystalline polymer semiconductors based on poly(2,5-bis(3-alkylthiophen-2-yl)thieno[3,2-b]thiophene). Polym Chem-Uk  vol. 1, (9) 1448-1452. 10.1039/c0py00056f

2009

Rolfe NJ, Heeney M, Wyatt PB, Drew AJ, Kreouzis T and Gillin WP (2009). Elucidating the role of hyperfine interactions on organic magnetoresistance using deuterated aluminium tris(8-hydroxyquinoline). Phys Rev B  vol. 80, (24) 10.1103/PhysRevB.80.241201

Kumar A, Baklar MA, Scott K, Kreouzis T and Stingelin-Stutzmann N (2009). Efficient, Stable Bulk Charge Transport in Crystalline/Crystalline Semiconductor-Insulator Blends. Adv Mater  vol. 21, (44) 4447-+. 10.1002/adma.200900717

Zhang SJ, Song JY, Kreouzis T and Gillin WP (2009). Measurement of the intersystem crossing rate in aluminum tris(8-hydroxyquinoline) and its modulation by an applied magnetic field. J Appl Phys  vol. 106, (4) 10.1063/1.3204015

Barlow IA, Kreouzis T and Lidzey DG (2009). High-speed electroluminescence modulation of a conjugated-polymer light emitting diode. Appl Phys Lett  vol. 94, (24) 10.1063/1.3147208

Drew AJ, Hoppler J, Schulz L, Pratt FL, Desai P, Shakya P, Kreouzis T, Gillin WP, Suter A, Morley NA, Malik VK, Dubroka A, Kim KW, Bouyanfif H, Bourqui F, Bernhard C, Scheuermann R, Nieuwenhuys GJ, Prokscha T and Morenzoni E (2009). Direct measurement of the electronic spin diffusion length in a fully functional organic spin valve by low-energy muon spin rotation. Nat Mater  vol. 8, (2) 109-114. 10.1038/NMAT2333

Barard S, Heeney M, Chen L, Colle M, Shkunov M, McCulloch I, Stingelin N, Philips M and Kreouzis T (2009). Separate charge transport pathways determined by the time of flight method in bimodal polytriarylamine. J Appl Phys  vol. 105, (1) 10.1063/1.3054180

2008

Song JY, Stingelin N, Gillin WP and Kreouzis T (2008). Reduced hole mobility due to the presence of excited states in poly-(3-hexylthiophene). Appl Phys Lett  vol. 93, (23) 10.1063/1.3049129

Shakya P, Desai P, Kreouzis T, Gillin WP, Tuladhar SM, Ballantyne AM and Nelson J (2008). The effect of applied magnetic field on photocurrent generation in poly-3-hexylthiophene:[6,6]-phenyl C61-butyric acid methyl ester photovoltaic devices. Journal of Physics-Condensed Matter  vol. 20, (45) 10.1088/0953-8984/20/45/452203

Rolfe N, Desai P, Shakya P, Kreouzis T and Gillin WP (2008). Separating the roles of electrons and holes in the organic magnetoresistance of aluminum tris(8-hydroxyquinoline) organic light emitting diodes. J Appl Phys  vol. 104, (8) 10.1063/1.3000454

Shakya P, Desai P, Somerton M, Gannaway G, Kreouzis T and Gillin WP (2008). The magnetic field effect on the transport and efficiency of group III tris(8-hydroxyquinoline) organic light emitting diodes. J Appl Phys  vol. 103, (10) 10.1063/1.2932079

Drew AJ, Pratt FL, Hoppler J, Schulz L, Malik-Kumar V, Morley NA, Desai P, Shakya P, Kreouzis T, Gillin WP, Kim KW, Dubroka A and Scheuermann R (2008). Intrinsic mobility limit for anisotropic electron transport in Alq3. Phys Rev Lett  vol. 100, (11) 10.1103/PhysRevLett.100.116601

Shakya P, Desai P, Kreouzis T and Gillin WP (2008). Magnetoresistance in triphenyl-diamine derivative blue organic light emitting devices. J Appl Phys  vol. 103, (4) 10.1063/1.2885097

Rolfe N, Desai P, Shakya P, Kreouzis T and Gillin WP (2008). Separating the roles of electrons and holes in the organic magnetoresistance of aluminum tris(8-hydroxyquinoline) organic light emitting diodes. Journal of Applied Physics  vol. 104, 10.1063/1.3000454

2007

Desai P, Shakya P, Kreouzis T and Gillin WP (2007). Magnetoresistance in organic light-emitting diode structures under illumination. Phys Rev B  vol. 76, (23) 10.1103/PhysRevB.76.235202

Tang HY, Donnan RS and Kreouzis T (2007). An optically controlled phase shifter employing the organic semiconductor poly(3-hexylthiophene). Appl Phys Lett  vol. 91, (20) 10.1063/1.2806936

Desai P, Shakya P, Kreouzis T and Gillin WP (2007). The role of magnetic fields on the transport and efficiency of aluminum tris(8-hydroxyquinoline) based organic light emitting diodes. J Appl Phys  vol. 102, (7) 10.1063/1.2787158

Barlow IA, Kreouzis T and Lidzey DG (2007). A polymer light-emitting diode as an optical communication light source. Org Electron  vol. 8, (5) 621-624. 10.1016/j.orgel.2007.04.003

Desai P, Shakya P, Kreouzis T, Gillin WP, Morley NA and Gibbs MRJ (2007). Magnetoresistance and efficiency measurements of Alq(3)-based OLEDs. Phys Rev B  vol. 75, (9) 10.1103/PhysRevB.75.094423

GILLIN WP (2007). Magnetoresistance and efficiency measurements of Alq3-based OLEDs. Phys. Rev. B  vol. 75, 094423-094429. 10.1103/PhysRevB.75.094423

Baldwin RJ, Kreouzis T, Shkunov M, Heeney M, Zhang W and McCulloch I (2007). A comprehensive study of the effect of reactive end groups on the charge carrier transport within polymerized and nonpolymerized liquid crystals. J Appl Phys  vol. 101, (2) 10.1063/1.2432045

Khan RUA, Poplavskyy D, Kreouzis T and Bradley DDC (2007). Hole mobility within arylamine-containing polyfluorene copolymers: A time-of-flight transient-photocurrent study. Phys Rev B  vol. 75, (3) 10.1103/PhysRevB.75.035215

2006

McCulloch I, Bailey C, Genevicius K, Heeney M, Shkunov M, Sparrowe D, Tierney S, Zhang W, Baldwin R, Kreouzis T, Andreasen JW, Breiby DW and Nielsen MM (2006). Designing solution-processable air-stable liquid crystalline crosslinkable semiconductors. Philos Trans a Math Phys Eng Sci  vol. 364, (1847) 2779-2787. 10.1098/rsta.2006.1854

Kim EG, Schmidt K, Caseri WR, Kreouzis T, Stingelin-Stutzmann N and Bredas JL (2006). Magnus' green salt revisited: Impact of platinum-platinum interactions on electronic structure and carrier mobilities. Adv Mater  vol. 18, (15) 2039-+. 10.1002/adma.200600252

Kreouzis T, Poplavskyy D, Tuladhar SM, Campoy-Quiles M, Nelson J, Campbell AJ and Bradley DDC (2006). Temperature and field dependence of hole mobility in poly(9,9-dioctylfluorene). Phys Rev B  vol. 73, (23) 10.1103/PhysRevB.73.235201

2005

Kreouzis T, Baldwin RJ, Shkunov M, McCulloch I, Heeney M and Zhang W (2005). High mobility ambipolar charge transport in a cross-linked reactive mesogen at room temperature. Appl Phys Lett  vol. 87, (17) 10.1063/1.2117632

Bushby RJ, Donovan KJ, Kreouzis T and Lozman OR (2005). Molecular engineering of triphenylene-based discotic liquid crystal conductors. Opto-Electron Rev  vol. 13, (4) 269-279.

2003

Choulis SA, Nelson J, Kim Y, Poplavskyy D, Kreouzis T, Durrant JR and Bradley DDC (2003). Investigation of transport properties in polymer/fullerene blends using time-of-flight photocurrent measurements. Appl Phys Lett  vol. 83, (18) 3812-3814. 10.1063/1.1624636

Osterbacka R, Genevicius K, Pivrikas A, Juska G, Arlauskas K, Kreouzis T, Bradley DDC and Stubb BH (2003). Quantum efficiency and initial transport of photogenerated charge carriers in pi-conjugated polymers. Synthetic Metals  vol. 139, (3) 811-813. 10.1016/S0379-6779(03)00267-4

Juska G, Genevicius K, Osterbacka R, Arlauskas K, Kreouzis T, Bradley DDC and Stubb H (2003). Initial transport of photogenerated charge carriers in pi-conjugated polymers. Phys Rev B  vol. 67, (8) 10.1103/PhysRevB.67.081201

Bunning JC, Donovan KJ, Kreouzis T, Scott K, Bushby RJ, Boden N and Lozman OR (2003). Quantum efficiencies of photogeneration in discotic liquid crystals. Part 2: Electric field and temperature dependence. Molecular Crystals and Liquid Crystals  vol. 397, 563-571. 10.1080/15421406390214194

Scott K, Donovan KJ, Kreouzis T, Bunning JC, Bushby RJ, Boden N and Lozman OR (2003). Quantum efficiency of photogeneration in discotic liquid crystals: Part 1: Temperature and wavelength dependence. Molecular Crystals and Liquid Crystals  vol. 397, 553-561. 10.1080/15421400390214185

Donovan KJ, Kreouzis T, Scott K, Bunning JC, Bushby RJ, Boden N, Lozman OR and Movaghar B (2003). Molecular engineering the phototransport properties of discotic liquid crystals. Molecular Crystals and Liquid Crystals  vol. 396, 91-112. 10.1080/15421400390213221

2002

Pecchia A, Lozman OR, Movaghar B, Boden N, Bushby RJ, Donovan KJ and Kreouzis T (2002). Photoconductive transients and one-dimensional charge carrier dynamics in discotic liquid crystals. Phys Rev B  vol. 65, (10) 10.1103/PhysRevB.65.104204

2001

Boden N, Bushby RJ, Donovan K, Liu QY, Lu ZB, Kreouzis T and Wood A (2001). 2,3,7, 8,12,13-Hexakis[2-(2-methoxyethoxy)ethoxy]-tricycloquinazoline: a discogen which allows enhanced levels of n-doping. Liq Cryst  vol. 28, (12) 1739-1748. 10.1080/02678290110082383

Kreouzis T, Donovan KJ, Boden N, Bushby RJ, Lozman OR and Liu Q (2001). Temperature-independent hole mobility in discotic liquid crystals. J Chem Phys  vol. 114, (4) 1797-1802. 10.1063/1.1334958

2000

Kreouzis T, Scott K, Donovan KJ, Boden N, Bushby RJ, Lozman OR and Liu Q (2000). Enhanced electronic transport properties in complementary binary discotic liquid crystal systems. Chemical Physics  vol. 262, (2-3) 489-497. 10.1016/S0301-0104(00)00323-2

Donovan KJ and Kreouzis T (2000). Deconvolution of time of flight photocurrent transients and electronic response time in columnar liquid crystals. Journal of Applied Physics  vol. 88, (2) 918-923. 10.1063/1.373755

1998

Donovan KJ, Kreouzis T, Boden N and Clements J (1998). One dimensional carrier trapping in the crystalline phase of a columnar liquid crystal. Journal of Chemical Physics  vol. 109, (23) 10400-10408. 10.1063/1.477695

Boden N, Bushby RJ, Clements J, Donovan K, Movaghar B and Kreouzis T (1998). Charge dynamics and recombination kinetics in columnar discotic liquid crystals. Physical Review B  vol. 58, (6) 3063-3074. 10.1103/PhysRevB.58.3063

1995

Boden N, Bushby RJ, Clements J, Movaghar B, Donovan KJ and Kreouzis T (1995). Mechanism of charge transport in discotic liquid crystals. Phys Rev B Condens Matter  vol. 52, (18) 13274-13280. 10.1103/PhysRevB.52.13274

TBC

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