Mats Fahlman

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Background

Master’s degree in Physics and Electrical Engineering, Link?ping University, 1991.

Ph.D. in Surface Physics and Chemistry, Link?ping University, 1995.

Postdoc at the Ohio State University, 1996-1998.

Assistant Professor, Department of Physics, Chemistry and Biology, Link?ping University, 1998-1999.

Associated Professor, Department of Science and Technology, Campus Norrk?ping, Link?ping University, 1999-2005.

Dean of Education in Physics and Electronic, Department of Science and Technology, Campus Norrk?ping, Link?ping University, 2001-2002.

Director of the Physics and Electronics sub-department, Department of Science and Technology, Campus Norrk?ping, Link?ping University, 2001- 2005, 2007.

Member of the Board of Directors, National Synchrotron Radiation Laboratory MAX-Lab, Lund, Sweden, 2001 – 2010.

Co-recipient of the EU Descartes Prize for development of polymer based light emitting diodes, 2003.

Director of the Master of Engineering Programs at the Norrk?ping Campus, Link?ping University, 2003-2006.

Chairman of the FASM (the Association for Synchrotron Radiation Users at MAX-lab) board, 2004-2007.

Professor in experimental physics 2005

Deputy director of the Electrical Engineering, Physics and Mathematical programs at Link?ping University, 2007 – 2008.

Professor in Surface Physics and Chemistry, Department of Physics, Chemistry and Biology, Link?ping University 2008 - present.

Won the G?ran Gustafsson Prize in Physics, 2013.



Research

Though my early interests included quantum chemical modeling of electronic structure in condensed organic materials, my research is now centered on experimental studies of semiconducting and conducting organic and hybrid organic systems. The approach is to do basic science on topics of technological importance, often in collaboration with companies. A wide variety of surface science techniques are used with emphasis on (resonant) photoelectron spectroscopy and x-ray absorption, mainly carried out at synchrotron radiation laboratories such as MAX-lab in Lund, but also using XPS/UPS equipment in our labs.

I currently pursue two main topics of research. One is the study of organic/organic and metal/organic interfaces (interface engineering) and their role in applications such as light emitting diodes, photovoltaic cells (solar cells), hybrid organic spin-valves, transistors and functional coatings (anti-static, anti-corrosion, bio-compatibility, magnetic). The other topic is hybrid organic spintronics, where we do materials development and thin film deposition of semiconducting organic-based molecular room temperature magnets, basic materials characterization and prototype device design and fabrication.

 

Recent Publications

A summary of my peer-reviewed journal publications and citations can be found here.

 

2014

 

Hybrid Interface States and Spin Polarization at Ferromagnetic Metal-Organic Heterojunctions: Interface Engineering for Efficient Spin Injection in Organic Spintronics, Shengwei Shi, Zhengyi Sun, Amilcar Bedoya, Patrizio Graziosi, Xin Li, Xianjie Liu, Luis Hueso, Valentin A. Dediu, Yi Luo, and Mats Fahlman, Advanced Functional Materials, in press.

Semi-metallic polymers, Olga Bubnova, Zia Ullah Khan, Hui Wang, Slawomir Braun, Drew R. Evans, Manrico Fabretto, Pejman Hojati-Talemi, Daniel Dagnelund, Jean-Baptiste Arlin, Yves H. Geerts, Simon Desbief, Dag W. Breiby, Jens W. Andreasen, Roberto Lazzaroni, Weimin M. Chen, Igor Zozoulenko, Mats Fahlman, Peter J. Murphy, Magnus Berggren and Xavier Crispin, Nature Materials, 13 (2014) 190. doi:10.1038/nmat3824


2013

 

Oxygen- and Water-Based Degradation in [6,6]-Phenyl-C61-Butyric Acid Methyl Ester (PCBM) Films, Qinye Bao, Xianjie Liu, Slawomir Braun and Mats Fahlman, Adv. Energy Mater., 2013, DOI: 10.1002/aenm.201301272

The Effect of Gate Electrode Work-Function on the Source Charge Injection in Electrolyte-Gated Organic Field-Effect Transistors,Simone Fabiano, Slawomir Braun, Mats Fahlman, Xavier Crispin and Magnus Berggren , Adv. Funct. Mater., 2013, 10.1002/adfm.201302070

 

Energy level alignment in Au/Pentacene/PTCDA trilayer stacks, P. Sehati, S. Braun and M. Fahlman, Chem. Phys. Lett., 2013, http://www.sciencedirect.com/science/article/pii/S0009261413009263

 

Role of intrinsic molecular dipole in energy level alignment at organic interfaces, Linda Lindell, Deniz ?ak?r, Geert Brocks, Mats Fahlman, and Slawomir Braun; Appl. Phys. Lett., http://dx.doi.org/10.1063/1.4809567 .

Photoelectron spectroscopy and modeling of interface properties related to organic photovoltaic cells, Mats Fahlman, Parisa Sehati, Wojciech Osikowicz, Slawomir Braun, Michel P. de Jong, Geert Brocks, J. Electron Spectrosc. Relat. Phenom., 190 (2013) 33–41.

 

Amphiphilic semiconducting copolymer as compatibility layer for printing polyelectrolyte-gated OFETs, H. Sinno, H.T. Nguyen, A. Hagerstrom, M. Fahlman, L. Lindell, O. Coulembier, P. Dubois, X. Crispin, I. Engquist, M. Berggren, Org. Electron., 14 (2013) 790.


2012

 

Charge equilibration and potential steps in organic semiconductor multilayers, G. Brocks, D. Cakir, M. Bokdam, M.P. de Jong, M. Fahlman, Org. Electron. 13 (2012) 1793.

The study of organic semiconductor/ferromagnet interfaces in organic spintronics: A short review of recent progress, Yiqiang Zhan and Mats Fahlman, J. Polym. Sci., Part B: Polym. Phys., 50 (2012) 1453.

Modeling charge transfer at organic donor-acceptor semiconductor interfaces, D. ?akir, M. Bokdam, M.P. de Jong, M. Fahlman, G. Brocks, Appl. Phys. Lett., 100 (2012) 203302.


2011

 

Spontaneous Charge Transfer and Dipole Formation at the Interface Between P3HT and PCBM, Harri Aarnio, Parisa Sehati, Slawomir Braun, Mathias Nyman, Michel P. de Jong, Mats Fahlman, Ronald ?sterbacka, Adv. Energy Mater., 1 (2011) 792.

Hybridization-induced oscillatory magnetic polarization of C(60) orbitals at the C(60)/Fe(001) interface, T.L.A. Tran, P.K.J. Wong, M.P. de Jong, W.G. van der Wiel, Y.Q. Zhan, M. Fahlman, Appl. Phys. Lett., 98 (2011) 222505.

Modified Surface Electronic and Magnetic Properties of La(0.6)Sr(0.4)MnO(3) Thin Films for Spintronics Applications, F.H Li, Y.Q. Zhan, T.H. Lee, X.J. Liu, A. Chikamatsu, T.F. Guo, H.J. Lin, J.C.A. Huang and M. Fahlman, J. Phys. Chem. C, 115 (2011) 16947.

Nitrile-Substituted QA Derivatives: New Acceptor Materials for Solution-Processable Organic Bulk Heterojunction Solar Cells, T.L. Zhou, T. Jia, B.N. Kang, F.H. Li,M. Fahlman, Y. Wang, Adv. Energy Mater.,   1 (2011) 431.

Electrochemical Control of Growth Factor Presentation To Steer Neural Stem Cell Differentiation, A. Herland, K.M. Persson, V. Lundin, M. Fahlman, M. Berggren, E.W.H. Jager, A.I. Teixeira, Angewandte Chemie - International edition, 50 (2011) 12529.

Photoinduced work function changes by isomerization of a densely packed azobenzene-based SAM on Au: a joint experimental and theoretical study, N. Crivillers, A. Liscio, F. Di Stasio, C. Van Dyck, S. Osella, D. Cornil, S. Mian, G. M. Lazzerini, O. Fenwick, E. Orgiu, F. Reinders, S. Braun, M. Fahlman, M. Mayor, J. Cornil, V. Palermo, F. Cacialli and P. Samorì, Phys. Chem. Chem. Phys., 13 (2011) 14302.

Optimization of the thermoelectric figure of merit in the conducting polymer poly(3,4-ethylenedioxythiophene), Olga Bubnova, Zia Ullah Khan, Abdellah Malti, Slawomir Braun, Mats Fahlman, Magnus Berggren and Xavier Crispin, Nature Materials, 10 (2011) 429.

Electronic structure of thin film cobalt tetracyanoethylene, Co(TCNE)x, E. Carlegrim, Y. Zhan, M.P. de Jong and M. Fahlman, Synthetic Metals 161 (2011) 1892– 1897.

Local Surface Potential of pi-Conjugated Nanostructures by Kelvin Probe Force Microscopy: Effect of the Sampling Depth, Andrea Liscio, Vincenzo Palermo, Oliver Fenwick, Slawomir Braun, Klaus Müllen, Mats Fahlman, Franco Cacialli and Paolo Samorí, Small, 7 (2011) 634.

Determination of energy level alignment at interfaces of hybrid and organic solar cells under ambient environment, Robert J. Davis, Matthew T. Lloyd, Summer R. Ferreira, Matthew J. Bruzek, Scott E. Watkins, Linda Lindell, Parisa Sehati, Mats Fahlman, John E. Anthony and Julia W. P. Hsu, J. Mater. Chem., 21 (2011) 1721.

Ultra-fast charge transfer in organic electronic materials and at hybrid interfaces studied using the core-hole clock technique, R. Friedlein, S. Braun, M.P. de Jong, W. Osikowicz, M. Fahlman and W.R. Salaneck, Journal of Electron Spectroscopy and Related Phenomena 183 (2011) 101.


2010

 

Thermoelectric properties of conducting polymers: The case of poly(3-hexylthiophene), Y. Xuan, X. Liu, S. Desbief, P. Leclère, M. Fahlman, R. Lazzaroni, M. Berggren, J. Cornil, D. Emin, and X. Crispin, Phys. Rev. B, 82 (2010) 115454.

Experimental evidence for ferromagnetism at room temperature in MgO thin films, Mukes Kapilashrami, Jun Xu, K.V. Rao, Lyuba Belova, Elin Carlegrim and Mats Fahlman, J. Phys: Condens. Matter, 22 (2010) 345004.

Characterization of the Ni/V(TCNE)x interface for hybrid spintronics applications, Elin Carlegrim, Yiqiang Zhan, Fenghong Li, Xianjie Liu and Mats Fahlman, Organic Electronics, 11 (2010) 1020.

Energy level alignment at metal-organic and organic-organic interfaces in bulk heterojunction solar cells, Parisa Sehati, Slawomir Braun, Linda Lindell, Xianjie Liu, L. Mattias Andersson and Mats Fahlman,

IEEE Journal of Selected Topics in Quantum Electronics, 16 (2010) 1718.

Electronic structure and molecular orientation of pentacene thin films on ferromagnetic La0.7Sr0.3MnO3, Fenghong Li, Patrizio Graziosi, Qun Tang, Yiqiang Zhan, Xianjie Liu, Valentin Dediu, and Mats Fahlman, Phys. Rev. B, http://link.aps.org/doi/10.1103/PhysRevB.81.205415

Efficient Spin Injection Through Exchange Coupling at Organic Semiconductor/Ferromagnet Heterojunctions, Yiqiang Zhan, Erik Holmstr?m, Raquel Lizárraga, Olle Eriksson, Xianjie Liu, Fenghong Li, Elin Carlegrim, Sven Stafstr?m and Mats Fahlman, Adv. Mater., 22 (2010) 1626.

Fermi level pinning at donor-acceptor molecular hetero-junctions in multi-layered thin film stack of TTF and TCNQ, Slawomir Braun, Xianjie Liu, William R. Salaneck and Mats Fahlman, Organic Electronics, 11 (2010) 212.

Solution processed ZnO nanowires/polyfluorene heterojunctions for large area lightening, A. Wadeasa, G. Tzamalis, P. Sehati, O. Nur, M. Fahlman, M. Willander, M. Berggren, X. Crispin, Chem. Phys. Lett., 490 (2010) 200.

Origin of the surface recombination centers in ZnO nanorods arrays by X-ray photoelectron spectroscopy, LL. Yang, Q.X. Zhao, M. Willander, X.J. Liu, M. Fahlman, J.H. Yang, Appl. Surf. Sci., 256 (2010) 3592.

Effective Suppression of Surface Recombination in ZnO Nanorods Arrays during the Growth Process, LL. Yang, Q.X. Zhao, M. Willander, X.J. Liu, M. Fahlman, J.H. Yang, Crystal Growth & Design, 10 (2010) 1904.


2009

 

Benzothiadiazole-Based Linear and Star Molecules: Design, Synthesis, and Their Application in Bulk Heterojunction Organic Solar Cells, Weiwei Li, Chun Du, Fenghong Li, Yi Zhou, Mats Fahlman, Zhishan Bo and Fengling Zhang, Chem. Mater., 12 (2009) 5327.

Tuning the Energy Levels of Photochromic Diarylethene Compounds for Opto-electronic Switch Devices, F.L.E. Jakobsson, P. Marsal, S. Braun, M. Fahlman, M. Berggren, J. Cornil and X. Crispin, J. Phys. Chem. C 113 (2009) 18396.

Interfacial electronic properties of pentacene tuned by a molecular monolayer of C60, X. Liu, Y. Zhan, S. Braun, F. Li, and M. Fahlman, Phys. Rev. B, 80 (2009) 115401.

Ferromagnetism above room temperature in nickel-tetracyanoethylene thin films, Pramod Bhatt, A. Kanciurzewska, E. Carlegrim, M. Kapilashrami, L. Belova, K. Venkat Rao and M. Fahlman, J. Mater. Chem., 19 (2009) 6610.

Tuning Work Function of Noble Metals As Promising Cathodes in Organic Electronic Devices, F.H. Li, Y. Zhou, F.L. Zhang, X.J. Liu,Y.Q. Zhan and M. Fahlman, Chem. Mater., 21 (2009) 2798.

Energy-Level Alignment at Organic/Metal and Organic/Organic Interfaces, S. Braun, W.R. Salaneck and M. Fahlman, Adv. Mater., 21 (2009) 1450.

The role of aluminum oxide buffer layer in organic spin-valves performance, Y.Q. Zhan, X.J. Liu, F.H. Li, I. Bergenti P. Graziosi, V. Dediu, M. Fahlman, Appl. Phys. Lett., 94 (2009) 053301.

Electronic structure of thin film iron-tetracyanoethylene: Fe(TCNE)x, Pramod Bhatt, E. Carlegrim, A. Kanciurzewska, M.P. de Jong, M. Fahlman, Appl Phys A, 95 (2009) 131.

Iron-Catalyzed Polymerization of Alkoxysulfonate-Functionalized 3,4-Ethylenedioxythiophene Gives Water-Soluble Poly(3,4-ethylenedioxythiophene) of High Conductivity, R.H. Karlsson A. Herland, M. Hamedi, J.A. Wigenius, A. Aslund, X.J. Liu, M. Fahlman, O. Inganas, P. Konradsson, Chem. Mater., 21 (2009) 1815.

Degradation of microporous polyaniline film by UV–ozone treatment, S. Golczak, A. Kanciurzewska, J.J. Langer and M. Fahlman, Polymer Degradation and Stability 94 (2009) 350.


2008

 

Energy level alignment and chemical interaction at Alq3/Co interfaces for organic spintronic devices, Y.Q. Zhan, M.P. de Jong, F.H. Li, V. Dediu, M. Fahlman, and W.R. Salaneck, Phys. Rev. B 78 (2008) 045208.

Air-stable organic-based semiconducting room temperature thin film magnet for spintronics applications, E. Carlegrim, A. Kanciurzewska, P. Nordblad and M. Fahlman, Appl. Phys. Lett., 92 (2008) 163308.

Near-edge x-ray absorption studies of Na-doped tetracyanoethylene films: A model system for the V(TCNE)x room-temperature molecular magnet, E. Carlegrim, B. Gao, A. Kanciurzewska, M.P. de Jong, Z. Wu, Y. Luo, and M. Fahlman, Phys. Rev. B 77 (2008) 054420.

The unoccupied electronic structure of the semi-conducting room temperature molecular magnet V(TCNE)2, E. Carlegrim, A. Kanciurzewska, M.P. de Jong, C. Tengstedt and M. Fahlman, Chem. Phys. Lett. 452 (2008) 173.

Control of Neural Stem Cell Adhesion and Density by an Electronic Polymer Surface Switch, Carmen Salto, Emilien Saindon, Maria Bolin, Anna Kanciurzewska, Mats Fahlman, Edwin W. H. Jager, Pentti Tengvall, Ernest Arenas, and Magnus Berggren, Langmuir, 24 (2008) 14133.

Comparative XPS surface study of polyaniline thin films, Sebastian Golczak, Anna Kanciurzewska, Mats Fahlman, Krzysztof Langer, Jerzy J. Langer, Solid State Ionics, 179 (2008) 2234.


2007

 

Photoelectron Spectroscopy of Conjugated Polymers, M. P. de Jong, G. Greczynski, W. Osikowicz, R. Friedlein, X. Crispin, M. Fahlman, W. R. Salaneck in: "Handbook of Conducting Polymers, Third Edition", T. A. Skotheim and J. R. Reynolds (ed.), CRC Press, Taylor & Francis Group, Boca Raton, 2007.

Electronic Structure of Surfaces and Interfaces in Conjugated Systems, M. L?gdlund, M. Fahlman, S. J?nsson, and W. R. Salaneck, in: "Semiconducting Polymers: Chemistry, Physics and Engineering", Second Edition, G. Hadziioannou and G. G. Malliarius, Editors, Wiley-VCH, p-141 (2007). ISBN: 978-3-527-31271-9.

Influence of Ti layer thickness on solid state amorphization and magnetic properties of annealed Ti/Ni multilayer, P. Bhatt, S.M. Chaudhari and M. Fahlman, J. Phys: Condens. Matter 19 (2007) 376210.

Study on Poly(3,4-ethylene dioxythiophene)-Poly(styrenesulfonate) as a plastic counter electrode in dye sensitized solar cells, A. Kanciurzewska, E. Dobruchowska, A. Baranzahi, E. Carlegrim, M. Fahlman and M.A. Girtu, J. Optoel. Adv. Mat., 9 (2007) 1052.

Electronic structure of hybrid interfaces for polymer-based electronics, M. Fahlman, A. Crispin, X. Crispin, S.K.M. Henze, M.P. de Jong, W. Osikowicz, C. Tengstedt and W.R. Salaneck, J. Phys.: Condens. Matter 19 (2007) 183202.

Chemical bonding in V(TCNE)x (x~2) thin-film magnets grown in situ, M. P. de Jong, C. Tengstedt, A. Kanciurzewska, E. Carlegrim, W. R. Salaneck, and M. Fahlman, Phys. Rev. B,75 (2007) 064407.

The effect of pH on the over-oxidation of PEDOT:PSS, P. Tehrani, A. Kanciurzewska, X. Crispin, N.D. Robinson, M. Fahlman, M. Berggren, Solid State Ionics 177 (2007) 3521.


2006

 

Towards all-plastic flexible light emitting diodes, F.L.E. Jakobsson, X. Crispin, L. Lindell, A. Kanciurzewska, M. Fahlman, W.R. Salaneck, M. Berggren, Chem. Phys. Lett. 433 (2006) 110.

Transition between energy level alignment regimes at a low band gap polymer-electrode interfaces, A. Crispin, X. Crispin, M. Fahlman, M. Berggren, W.R. Salaneck, Appl. Phys. Lett. 89 (2006) 213503.

Ultraviolet light-ozone treatment of poly(3,4-ethylenedioxy-thiophene)-based materials resulting in increased work functions, Carl Tengstedt, Anna Kanciurzewska, Michel P. de Jong, Slawomir Braun, William R. Salaneck and Mats Fahlman, Thin Solid Films 515 (2006) 2085.

Ultraviolet photoelectron spectroscopy of polymers, M.P. de Jong, R. Friedlein, W. Osikowicz, W.R. Salaneck and M. Fahlman, Mol.Crys. & Liq. Crys. 455 (2006) 193.

Energetics at Au top- and bottom contacts on conjugated polymers, W. Osikowicz, M. P. de Jong, S. Braun, C. Tengstedt, M. Fahlman and W.R. Salaneck, Appl. Phys. Lett. 88 193504 (2006).

Fermi level pinning at conjugated polymer interfaces, C. Tengstedt, W. Osikowicz, W.R. Salaneck, I.D. Parker, C-H. Hsu and M. Fahlman, Appl. Phys. Lett. 88 (2006) 053502.

X-ray Magnetic Circular Dichroism and Resonant Photoemission of V(TCNE)x Hybrid Magnets, C. Tengstedt, M.P. de Jong, A. Kanciurzewska, E. Carlegrim, and M. Fahlman, Phys. Rev. Lett. 96 (2006) 057209.


2005

 

Photoemission of Alq3 and C60 films on Al and LiF/Al substrates, S.K.M. J?nsson, W.R. Salaneck and M. Fahlman, J. Appl. Phys., J. Appl. Phys., 98 (2005) 14901.

Photoelectron spectroscopy of the contact between the cathode and the active layers in plastic solar cells: the role of LiF, S.K.M. J?nsson, E. Carlegrim, F. Zhang, W.R. Salaneck and M. Fahlman, Jpn. J. Appl. Phys., 44 (2005) 3695.

Orbital-specific dynamic charge transfer from Fe(II)-tetraphenylporphyrin molecules to molybdenum disulfide substrates, M.P. de Jong, R. Friedlein, S.L. Sorensen, G. Ohrwall, W. Osikowicz, C. Tengsted, S.K.M. J?nsson, M. Fahlman, W.R. Salaneck, Phys. Rev. B., 72 (2005) 035448.

Study and comparison of conducting polymer hole transporting layers in light emitting devices, C. Tengstedt, A. Crispin, C. Hsu, H. Skulason, I.D. Parker, W.R. Salaneck and M. Fahlman, Org. El., 6 (2005) 21.

Evidence for Mn2+ ions at surfaces of La0.7Sr0.3MnO3 thin films, M. P. de Jong, I. Bergenti, V. A. Dediu, M. Fahlman , M. Marsi, C. Taliani, Phys. Rev. B, 71 (2005) 014434.

Interfacial properties of photovoltaic TiO2/dye/PEDOT–PSS heterojunctions, E.M.J. Johansson, A. Sandell, H. Siegbahn, H. Rensmo, B. Mahrov, G. Boschloo, E. Figgemeier, A. Hagfeldt, S.K.M. J?nsson and M. Fahlman, Synt. Met. 149 (2005) 157.

 

                                                                                                                                                                Editor: Jian Wei

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