cfaed Seminar Series

cfaed Seminar Series

Prof. Dr. Michael Sommer , TU Chemnitz, Institut für Chemie

Defective conjugated polymers: syntheses, main chain defect analyses and high performance materials

15.11.2017 (Wednesday) , 14:00 - 15:30
Chemie Neubau, Seminar room CHE 182 (ground floor) , Bergstr. 66 , 01069 Dresden


This presentation reports on the characterization of electronic main-chain defects unintentionally formed during the synthesis of conjugated polymers under non-optimum conditions and their consequences in electronic devices. While a plethora of new building blocks and suitable candidates of high performance conjugated polymers have been presented recently, much less attention has been devoted to batch-to-batch reproducibility, device reproducibility and comparability of literature results. It is shown that main chain electronic defects unintentionally form through homocoupling reactions that are prevalent and significantly impact the performance of electronic devices (e.g. solar cells).[1-6] Importantly, such defect structures can form independent of the polycondensation method used, and thus need to be analyzed from case to case. Several examples of high-performance conjugated polymers made by C-H activation polycondensation or Suzuki polycondensation will be presented in which main chain defects are analyzed on a quantitative basis. It is suggested that main chain defects must be considered in addition to molecular weight and dispersity to explore the full potential of a polymeric semiconductor, and to enhance comparability of results.[6]



[1] Lombeck, F.; Komber, H.; Gorelsky, S.; Sommer, M. ACS MacroLett 2014, 3, 819.
[2] Luzio, A.; Fazzi, D.; Nübling, F.; Matsidik, R.; Straub, A.; Komber, H.; Giussani, E.; Watkins, S.; Barbatti, M.; Thiel, W.; Gann, E.; Thomsen, L.; McNeill, C. R.; Caironi, M.; Sommer, M. Chem. Mater. 2014, 26, 6233-6240
[3] Lombeck, F., Matsidik, R., Komber, H., Sommer, M., Macromol. Rapid Commun. 2015, 36, 231
[4] Matsidik, R., Komber, H., Luzio, A., Caironi, M., Sommer, M, J. Am. Chem. Soc. 2015, 137, 6705-6711
[5] S. Broll, F. Nübling, A. Luzio, H. Komber, M. Caironi, M. Sommer, Macromolecules 2015, 48, 7481–7488
[6] F. Lombeck et al., Adv. Energy Mater. 2016, 6, 1601232.



04/17-present Full Professor (W3) for Polymer Chemistry at TU Chemnitz
10/14-04/17 Member of the Freiburger Institute for Interactive Materials and Bioinspired
Technologies (FIT)
02/12-04/17 Laboratory head of the Scale-Up Laboratory at the Freiburg Materials Research
Center (FMF)
02/12-04/17 Group leader at the Department of Macromolecular Chemistry Freiburg
01/10-01/12 Postdoc at the Melville Laboratory for Polymer Synthesis, University of Cambridge,
UK (Prof. W. Huck)
06/05-09/09 Research affiliate a at the Department of Macromolecular Chemistry I, University
of Bayreuth (Prof. M. Thelakkat)


12/16 Helmut-Holzer Prize of the Wissenschaftliche Gesellschaft Freiburg
09/15 Reimund-Stadler Prize of the GDCh for young Professor Aspirants in the field of Polymer-Chemistry
06/15 Max-Buchner-Research Foundation of the DECHEMA
01/15 ADUC Prize for Habilitations 2015
05/10 Otto Warburg Prize “Best PhD Thesis in Chemistry 2009” from the University of Bayreuth

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