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Panagiotis Keivanidis

Project Leader

Fellow-PhD

IIT@POLIMI


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Bio

h-index=16 (Web of Science, June 2014), ResearcherID (Thomson Reuters)

 Panagiotis E. Keivanidis was born in Pireas, Greece in 1976. In the period of 1995 – 2000 he studied Chemistry at the Chemistry Department of University of Crete in Heraklion, Greece. In 1998 he completed his practical work in the industrial sector (SaniCot SA, Piraeus) and in 2000 he completed his Diploma Thesis in the Luminescence Group of Prof. A. Meijerink, at the University of Utrecht, the Netherlands. In 2001 he worked as a lab assistant in the Sol-Gel Lab of the Institute of Materials Science, at the National Centre for Scientific Research ‘Demokritos’ in Athens, Greece. In 2005 he received his PhD (magna cum laude) in Natural Sciences (doctor rerum naturalium) from Johannes Gutenberg University of Mainz in Germany for his studies on the electronic energy transfer processes in π-conjugated polymers, in the Solid State Chemistry Group of Prof. G. Wegner at the Max Planck Institute for Polymer Research (MPI-P). In the period of 2005 – 2008 he was a Research Associate in the Optoelectronics Group of Prof. Sir R. H. Friend in the Cavendish Laboratory at Cambridge, UK where he performed research on the development of low dark-current solution-processed organic photodetectors and on the study of perylene diimide derivatives as functional n-type materials in organic photodiodes and solar cells. In the period of 2008 – 2010 he was a Research Associate in the Group of Experimental Solid State Physics in the Blackett Laboratory at Imperial College London working with Prof. J. Nelson and Prof. D. D. C. Bradley. During his staying in London he performed transient absorption and delayed luminescence spectroscopic experiments (in the μs - ms time range), for correlating the efficiency of charge photogeneration and recombination in organic photovoltaic composites with their layer microstructure. He has been active in the attraction of funds for research (Laser Lab Europe, Royal Society) and for the establishment of research networks between Imperial College and external collaborators. He was a visiting scientist in the Chemical Physics Group, at the Chemical Centre of University of Lund, Sweden and in the Organic Optoelectronics Group at MPI-P. He is the author and co-author of more than 30 peer-reviewed articles appeared in international scientific Journals and he is the co-inventor in one international patent with SONY International (Europe), US Patent 7,683,363 (2010), EP1484379, AU 2004/202413, JP 2005/049824.

 Since September 2010 he holds a project leader position in the Device Technology & Chemical Physics Group at the CNST@PoliMi. To this end he has been the supervisor of four PhD students, two post-doctoral research associates, two Master students and two 3rd Year undergraduate students. Formally, he is a co-supervisor in a Marie Curie Initial Training Network (project DESTINY).

 In the period 05/2012 - 05/2014 he held an Intra European Marie Curie Fellowship (project DELUMOPV) and he served as a Marie Curie Ambassador for the dissemination of European scientific activities on the field of Organic Electronics in high schools of southern European countries (Spain, Greece, Portugal).

 In December 2013 Panos accepted an Assistant Professor position offered by the Department of Mechanical Engineering and Materials Science and Engineering of the Cyprus University of Technology, in Limassol, Cyprus (official starting date 01/09/2014).

Projects

The Keivanidis research group is active in the electro-optical characterization of organic nanostructured materials to be used in organic photovoltaic (OPV) and photonic applications and it pays special attention on the elucidation of the structure-property-function relationships that dictate the performance of these systems.


Emphasis is given on the development of experimental tools and fabrication protocols that can uncork the existing bottlenecks to the protection, the optimization and the sensitization of organic electronic devices. Within this context, research projects are currently ongoing on:

i) the development of fullerene-free organic solar cells based on low-cost perylene diimide electron acceptors,

ii) the optimization of solid-state organic photon up-converters,

iii) the use of phosphorimetric spectroscopy techniques for the study of solution-processed barrier materials that aim to  protect Organic Electonics,

iv) the correlation of delayed (in the μs time-scale) charge transfer luminescence in OPV composites with charge transport properties of the composites,

v) the identification of the limiting factors in power-generating and light-sensing devices with the use of transient photocurrent and transient photovoltage characterization measurements,

vi) the use of sol-gel protocols for the development of metal oxides to be used as charge extraction layers in power-generating and photo-detecting devices.

 

BASED ON EXTERNAL FUNDING

- The Royal Society International Exchanges Scheme-2013/R3: 'Understanding how to improve non-fullerene based organic solar cells'

- Intra European Marie Curie Fellow: FP7-PEOPLE-2011-IEF project DELUMOPV 

- Principle investigator: John S. Latsis Public Benefit Foundation Research Project 2013

- Principle investigator: collaborative project between SAES Getters and CNST@PoliMi IIT

- Co-supervisor: FP7-PEOPLE-2012-ITN project DESTINY

- R&D project SOLAR PRINT betewen OMET s.r.l. and CNST@PoliMi IIT

Selected Publications

36. Goudarzi H. and Keivanidis P. E.,  'Triplet-Triplet Annihilation Induced Up-Converted Delayed Luminescence in Solid State Organic Composites: Monitoring Low-Energy Photon Up-Conversion at Low Temperatures', J. Phys. Chem. C, 2014, DOI 10.1021/jp5052936

35. Singh R., Giussani E., Mrόz M. M., Di Fonzo F., Fazzi D., Cabanillas-González J., Oldridge L., Vaenas N., Kontos A. G., Falaras P., Grimsdale A. C., Jacob J., Müllen K., Keivanidis P. E., 'On the role of aggregation effects in the performance of perylene-diimide based solar cells', Organic Electronics, 15, 7, 1347, 2014, View author presentation!

34. Aluicio-Sarduy E., Baidak A., Vougioukalakis G. C., Keivanidis P. E., 'Phosphorimetric Characterization of Solution-Processed Polymeric Oxygen-Barriers for the Encapsulation of Organic Electronics', J. Phys. Chem. C, 118, 5, 2361, 2014

33. Abramavičius V., Amarasinghe Vithanage D., Devižis A., Infahsaeng Y., Bruno A., Foster S., Keivanidis P. E., Abramavičius D., Nelson J., Yartsev A., Sundström V., Gulbinas V., 'Carrier motion in as-spun and annealed P3HT:PCBM blends revealed by ultrafast optical electric field probing and Monte Carlo simulations', Phys. Chem. Chem. Phys., 16, 2686, 2014

32. Kan Z., Colella L., Canesi E. V., Lerario G., Kumar R. Sai Santosh, Bonometti V., Mussini P. R., Cavallo G., Terraneo G., Pattanasattayavong P., Anthopoulos T. D., Bertarelli C., Keivanidis P. E., ‘Triple bulk heterojunctions as means for recovering the microstructure of photoactive layers in organic solar cell devices’, Solar Energy Mater. & Solar Cells, 120, 37, 2014, View author presentation!

31. Ye T., Singh R., Butt H.-J., Floudas G., Keivanidis P. E., 'Effect of local and global structural order on the performance of perylene diimide excimeric solar cells', ACS Appl. Mater. Interfaces, 5 , 11844, 2013

30. Farina M., Ye T., Lanzani G., di Donato A., Venanzoni G., Mencarelli D., Pietrangelo T., Morini A., Keivanidis P. E., 'Fast Ultrahigh-Density Writing of Low Conductivity Patterns on Semiconducting Polymers', Nat. Commun., 4, 2668, 2013

29. Singh R., Mrόz M. M., Di Fonzo F., Cabanillas-Gonzalez J., Marchi E., Bergamini G., Müllen K., Jacob J., Keivanidis P. E., 'Improving the layer morphology of solution-processed perylene diimide organic solar cells with the use of a polymeric interlayer', Organic Photonics and Photovoltaics, 1, 24, 2013

28. Amarasinghe Vithanage D., Devizis A., Abramavicius V., Infahsaeng Y.,  Abramavicius D., MacKenzie R. C. I., Keivanidis P. E., Yartsev A., Hertel D., Nelson J., Sundstrom V. & Gulbinas V.,  ‘Visualizing charge separation in bulk heterojunction organic solar cells’, Nat. Commun., 4, 2334, 2013, See also Research Highlights in Nature Nanotechnology!

27. Voigt M. M., Mackenzie R. C. I., King S. P., Yau C. P., Atienzar P.,Dane J., Keivanidis P. E., Zadrazil I., Bradley D. D. C., Nelson J., 'Gravure printing inverted organic solar cells: The influence of ink properties on film quality and device performance', Solar Energy Mater. & Solar Cells, 105, 77, 2012

26. Keivanidis P. E., Kamm V., Zhang W., Floudas G., Laquai F., McCulloch I., Bradley D. D. C., Nelson J., ‘Correlating emissive non-geminate recombination with photocurrent generation efficiency in polymer:perylene diimide organic photovoltaic blend films’, Adv. Funct. Mater., 22, 2318, 2012

25. Kirkpatrick J., Keivanidis P. E., Bruno A., Ma F., Haque S., Yartsev A., Sundstrom V., Nelson J., ‘Ultrafast Transient Optical Studies of Charge Pair Generation and Recombination in Poly-3-Hexylthiophene(P3ht):[6,6]Phenyl C61 Butyric Methyl Acid Ester (PCBM) Blend Films’, J. Phys. Chem. B, 115, 15174, 2011

24. Keivanidis P. E., Laquai F., Robertson J. W. F., Baluschev S., Jacob J., Müllen K., Wegner G., ‘Electron-exchange assisted photon energy up-conversion in thin films of π-conjugated polymeric composites’, J. Phys. Chem. Lett., 2, 1893, 2011

23. Keivanidis P. E., Laquai F., Howard I. A., Friend R. H., ‘Room temperature phase demixing in bulk heterojunction layers of solution-processed organic photodetectors: The effect of active layer ageing on the device electro-optical properties’,Adv. Funct. Mater. 21, 1355, 2011

22. Faist M., Keivanidis P. E., Foster S., Durrant J. R., Bradley D. D. C., Nelson J., ‘Effect of multiple fullerene adducts on charge generation in poly(3-hexylthiophene-2, 5- diyl):[6, 6]-phenyl-C61 butyric acid methyl ester photovoltaic blends ’, J. Polym. Sci. Pol. Phys., 49, 45,  2011

21. Voigt M. M., Mackenzie R. C. I., Yau C. P., Atienzar P., Dane J.,Keivanidis P. E., Bradley D. D. C., NelsonJ., ‘Gravure printing for three subsequent solar cell layers of inverted structures on flexiblle subtrates’, Solar Energy Mater. & Solar Cells, 95, 731, 2011

20. Keivanidis P. E., Kamm V., Dyer – Smith C., Zhang W., Laquai F., McCulloch I., Bradley D. D. C., Nelson J.,  ‘Delayed luminescence spectroscopy of organic photovoltaic binary blend films: Probing the emissive non-geminate charge recombination’, Adv. Mater., 22, 5183, 2010

19. Keivanidis P. E., Ho P. K. H., Friend R. H., Greenham N. C., ‘The dependence of device dark current on the active-layer morphology of solution-processed organic photodetectors’, Adv. Funct. Mater, 20, 3895, 2010

18. Keivanidis P. E., Clarke T. M., Lilliu S., Agostineli T., MacDonald J. E., Durrant J. R., Bradley D. D. C., Nelson J., ‘Dependence of Charge Separation Efficiency on Film Microstructure in Poly(3-hexylthiophene-2,5-diyl): [6,6]-Phenyl-C61 Butyric Acid Methyl Ester Blend Films’, J. Phys. Chem. Lett., 734, 1, 2010

17. Howard I. A., Laquai F., Keivanidis P. E., Friend R. H., Greenham N. C., ‘Perylene as an Electron Acceptor in Organic Solar Cells: Charge Generation and Relaxation Studied by Ultrafast Transient Absorption’, J. Phys. Chem. C, 21225, 113, 2009

16. Friedel B., Keivanidis P. E., Brenner T., Friend R. H., Greenham N. C., ‘Effects of Layer Thickness and Annealing of PEDOT:PSS Layers in Organic Photodetectors’, Macromolecules, 6741, 42, 2009

15. Keivanidis P. E., Baluschev S., Lieser G., Wegner G., ‘Inherent photon energy recycling effects in the up-converted delayed luminescence dynamics of poly(fluorene):Pt(II)octaethyl porphyrin blends’, Chem. Phys. Chem., 10, 2316, 2009

14. Keivanidis P. E., Khong S. -H., Greenham N. C., Ho P. K. H., Friend R. H.,  ‘All-solution based device engineering of multilayer polymeric photodiodes: minimizing dark current’, Appl. Phys. Lett., 173303, 94, 2009

13. Foster S., Finlayson C., Keivanidis P. E., Friend R. H., Otten M., Lu L., Schwartz E., Nolte R., Rowan A., ‘Improved Performance of Perylene-based Photovoltaic Cells using Polyisocyanopeptide Arrays’, Macromolecules, 2023, 42, 2009

12. Kang J.,  Jo J., Jo Y., Lee S. -Y.,  Keivanidis P. E.,  Wegner G., Yoon D. Y., ‘Time-Resolved Photoluminescence Study of Low-Energy Emission Mechanisms in Oligofluorene and Polyfluorene Films’, Polymer, 49, 26, 5700, 2008

11. Keivanidis P. E., Howard I. A., Friend R. H., ‘Intermolecular interactions of perylene diimides in photovoltaic blends of fluorene copolymers: Disorder effects on photophysical properties, film morphology and device efficiency’, Adv. Funct. Mater., 3189, 18,  2008

10. Keivanidis P. E., Greenham N. C., Sirringhaus H., Friend R. H., Blakesley J. C., Speller R., Campoy-Quiles M., Agostinelli T., Bradley D. D. C., Nelson J., ‘X-ray stability and response of polymeric photodiodes for imaging applications’, Appl. Phys. Lett., 023304,  92, 2008 See coverage in Biophotonics!

9. Blakesley J. C., Keivanidis P. E., Campoy-Quiles M., Newman C. R., Jin Y., Speller R., Sirringhaus H., Greenham N. C., Nelson J., Stavrinou P., ‘Organic semiconductor devices for X-ray imaging’, Nucl. Instrum. Meth. Phys. Res. A, 580, 774, 2007

8. Chochos C. L., Kallitsis J. K., Keivanidis P. E., Baluschev S., Gregoriou V. G., ‘Thermally stable blue emitting terfluorene block copolymers’, J. Phys. Chem. B.,  110 (10), 4657, 2006

7. Laquai F., Keivanidis P. E., Baluschev S., Jacob J., Müllen K., Wegner G., ‘Low-threshold amplified spontaneous emission in thin films of poly(tetraarylindenofluorene)’, Appl. Phys. Lett., 261917, 87, 2005

6. Baluschev S., Jacob J., Avlasevich Y.S, Keivanidis P. E., Miteva T., Grimsdale A.C., Müllen K. and Wegner G., ‘Enhanced operational stability of the up-conversion fluorescence in films of palladium-porphyrin end-capped poly(pentaphenylene)’, Chem. Phys. Chem., 6 (7), 1193, 2005 See cover page in Chem. Phys. Chem!

5. Keivanidis P. E., Jacob J., Oldridge L., Sonar P., Carbonnier B., Baluschev S., Grimsdale A. C, Müllen K., Wegner G., ‘Photophysical characterization of light-emitting poly(indenofluorene)s’, Chem. Phys. Chem., 6 (7), 6, 1650, 2005

4. Baluschev S., Keivanidis P. E., Wegner G., Jacob J., Grimsdale A.C., Müllen K., Miteva T., Yasuda A., Nelles G., ‘Upconversion photoluminescence in poly(ladder-type-pentaphenylene) doped with metal (II)-octaethyl porphyrins’, Appl. Phys. Lett., 061904,  86, 2005

3. Keivanidis P. E., Baluschev S., Miteva T., Nelles G., Scherf U., Yasuda A., Wegner G. , Adv. Mater., ‘Up-conversion photoluminescence in polyfluorene doped with metal (II)-octaethyl porphyrins’, 15 (24), 2095, 2003

2. Lupton J. M., Schouwink P., Keivanidis P. E., Grimsdale A. C., Müllen K., ‘Influence of dendronization on spectral diffusion and aggregation in conjugated polymers’, Adv. Funct. Mater. 13 (2), 154, 2003

1. Trapalis C. C., Keivanidis P., Kordas G., Zaharescu M., Crisan M., Szatvanyi A., Gartner M., ‘TiO2(Fe3+) nanostructured thin films with antibacterial properties’, Thin Solid Films,  433 (1-2), 186, 2003

Awards

- Offered a sponsorship from the Cambridge Integrated Knowledge Centre in Advanced Manufacturing Technologies and Electronics, CIKC

- Received the Nature Materials Best Poster award in the E-MRS 2007 in Strasbourg, France

- Awarded with the distinction of ‘Outstanding Scientist performing scientific research abroad’ from the Ministry of National Defence of the Hellenic Republic

 

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