Université Libre de Bruxelles

Chimie des Polymères CP 206/01

Campus de la Plaine

1050 Bruxelles


Office : 1C5 113

Phone : +32 2 650 53 95

Fax : +32 2 650 54 10

E-mail :


Guillaume Schweicher is a FNRS Research Associate (Chercheur Qualifié) at the Université Libre de Bruxelles (ULB, Belgium) and a visiting scientist at the University of Cambridge (UK) and at IMEC (Interuniversity Microelectronics Centre, Belgium). He received his Master in Chemical Engineering (2008) and Ph.D. (2012) from ULB, followed by post-doctoral appointments at Stanford University (US, 2013, Zhenan Bao), the University of Cambridge (UK, 2014-2019, Henning Sirringhaus) and ULB (Belgium, 2019-2021, Yves Geerts). In 2021, Guillaume got awarded a tenured “Chercheur Qualifié” position from the FNRS to start his group, at ULB, in October of the same year. His research interests aim at developing novel organic and hybrid semiconducting materials for a greener and more sustainable electronics. For him, microscopy images are bridging the gap between science and art, intriguing and leading to reflection. Since October 2019, he started to interact with Ohme, a Belgian transdisciplinary and creative label, as an Associate Researcher on the establishment of art and sciences contents in accessible, educational and interactive formats. Some of his shots have been presented during the exhibition “.IMG | des images qui se regardent”, 08-09/2020, See U, Brussels, Belgium and “Order Of Operations”, 06-07/2021, BOZAR, Brussels, Belgium. So far, the most notable outcome from this collaboration is the realisation of the audiovisual performance: “Tales of Entropy”, staging the irresistible beauty and poetry of an organic compound changing its physical state in a thermal gradient, under polarized light, premiered 2020/10/23, Pilar, Brussels.


  • Transport properties of condensed matter
  • Electronic properties of materials and transport
  • Molecular electronics
  • Structural properties of materials
  • Solid state materials
  • Thin films

Key Publications

A full publication list can be found on Google Scholar

Alignment of Organic Semiconductors

  • G. Schweicher, G. Gbabode, F. Quist, O. Debever, N. Dumont, S. Sergeyev, Y. H. Geerts* “Homeotropic and Planar Alignment of Discotic Liquid Crystals: The Role of the Columnar Mesophase” Chemistry of Materials 2009, 21, 5867
    DOI: 10.1021/cm902634r
  • G. Schweicher, N. Paquay, C. Amato, R. Resel, M. Koini, S. Talvy, V. Lemaur, J. Cornil, Y. H. Geerts*, G. Gbabode “Toward Single Crystal Thin Films of Terthiophene by Directional Crystallization using a Thermal Gradient” Crystal Growth and Design 2011, 11, 3663
    DOI: 10.1021/cg2007793
  • G. Schweicher, G. Liu*, P. Fastré, R. Resel, M. Abbas, G. Wantz, Y. H. Geerts, “Directional Crystallization of C8-BTBT-C8 Thin Films in a Temperature Gradient” Materials Chemistry Frontiers 2021, 5, 249
    DOI: 10.1039/D0QM00472C

Rational Design of Organic Semiconductors

  • G. Schweicher, V. Lemaur, C. Niebel, C. Ruzié, O. Goto, W.-Y. Lee, Y. Kim, Y. Diao, J.-B. Arlin, J. Karpinska, A. R. Kennedy, S. R. Parkin, Y. Olivier, S. C. B. Mannsfeld, J. Cornil, Y. H. Geerts*, Z. Bao*“Bulky End-Capped [1]Benzothieno[3,2-b]benzothiophenes: Reaching High Mobility Organic Semiconductors by Fine Tuning of the Crystalline Solid-State Order” Advanced Materials 2015, 27, 19, 3066
    DOI: 10.1002/adma.201500322
  • H. Y. Chen*, G. Schweicher*, M. Planells, S. M. Ryno, K. Broch, A. J. P. White, D. Simatos, M. Little, C. Jellett, S. Cryer, A. Marks, M. Hurhangee, J.-L. Brédas, H. Sirringhaus, I. McCulloch “Crystal Engineering of Dibenzothiophenothieno[3,2-b]thiophene (DBTTT) Isomers for Organic Field-Effect Transistors” Chemistry of Materials 2018, 30, 7587
    DOI: 10.1021/acs.chemmater.8b02757

Charge Transport Mechanisms

  • S. Illig*, A. S. Eggeman, A. Troisi, L. Jiang, C. Warwick, M. Nikolka, G. Schweicher, S. G. Yeates, Y. H. Geerts, J. E. Anthony, H. Sirringhaus* “Reducing dynamic disorder in small molecule organic semiconductors by suppressing large-amplitude thermal motions” Nature Communications 2016, 7, 10736
    DOI: 10.1038/ncomms10736
  • T. YusukeG. Schweicher, B. Chattopadhyay, T. Sakurai, J.-B. Arlin, C. Ruzié, A. Aliev, A. Ciesielski, S. Colella, A. R. Kennedy, V. Lemaur, Y. Olivier, R. Hadji, L. Sanguinet, F. Castet, S. Osella, D. Dudenko, D. Beljonne, J. Cornil, P. Samorì, S. Seki*, Y. H. Geerts* “Unraveling Unprecedented Charge Carrier Mobility through Structure Property Relationship of Four Isomers of Didodecyl[1]benzothieno[3,2-b][1]benzothiophene” Advanced Materials 2016, 28, 33, 7106
    These authors contributed equally to this work.
    DOI: 10.1002/adma.201601285
  • G. Schweicher*, M. T. Ruggiero, G. D’Avino, D. J. Harkin, K. Broch, D. Venkateshvaran, G. Liu, A. Richard, C. Ruzié, J. Armstrong, A. R. Kennedy, K. Shankland, K. Takimiya, Y. H. Geerts, J. A. Zeitler, S. Fratini*, H. Sirringhaus* “Chasing the ‘killer’ phonon mode for the rational design of low disorder, high mobility molecular semiconductors” Advanced Materials 2019, 31, 1902407
    These authors contributed equally to this work.
    DOI: 10.1002/adma.201902407

Spin Transport Mechanisms

  • A. Wittmann, G. Schweicher, K. Broch, J. Novak, V. Lami, D. Cornil, E. R. McNellis, O. Zadvorna, D. Venkateshvaran, K. Takimiya, Y. H. Geerts, J. Cornil, Y. Vaynzof, J. Sinova, S. Watanabe, H. Sirringhaus* “Tuning Spin Current Injection at Ferromagnet/Non-Magnet Interfaces by Molecular Design”. Physical Review Letters 2020, 124, 027204
    DOI: 10.1103/PhysRevLett.124.027204

Heat Transport Mechanisms

  • M. N. Gueye, A. Vercouter, R. Jouclas, D. Guérin, V. Lemaur, G. Schweicher *, S. Lenfant, A. Antidormi, Y. Geerts, C. Melis, J. Cornil*, D. Vuillaume*, “Thermal conductivity of benzothieno-benzothiophene derivatives at the nanoscale” Nanoscale 2021, 13, 3800
    DOI: 10.1039/D0NR08619C
  • Selezneva, A. Vercouter, G. Schweicher , V. Lemaur, K. Broch, A. Antidormi, K. Takimiya, V. Coropceanu, J.-L. Brédas, C. Melis*, J. Cornil*, H. Sirringhaus* “Strong Suppression of Thermal Conductivity in the Presence of Long Terminal Alkyl Chains in Low-Disorder Molecular Semiconductors”. Advanced Materials 2021, 33, 37, 2008708
    These authors contributed equally to this work.
    DOI: 10.1002/adma.202008708

Stability of electronic devices 

  • M. Nikolka*, G. Schweicher, J. Armitage, I. Nasrallah, C. Jellett, Z. Guo, M. Hurhangee, A. Sadhanala, I. McCulloch, C. B. Nielsen, H. Sirringhaus* “Performance Improvements in Conjugated Polymer Devices by Removal of Water-Induced Traps” Advanced Materials 2018, 30, 1801874
    DOI: 10.1002/adma.201801874


  • G. Schweicher, G. Garbay, R. Jouclas, F. Vibert, F. Devaux, Y. H. Geerts* “Molecular Semiconductors for Logic Operations: Dead-end or Bright Future?” Advanced Materials 2020, 32, 10, 1905909
    DOI: 10.1002/adma.201905909
  • S. Fratini, M. Nikolka, A. Salleo, G. Schweicher, H. Sirringhaus* “Charge transport in high-mobility conjugated polymers and molecular semiconductors” Nature Materials 2020, 19, 491
    DOI: 10.1038/s41563-020-0647-2