Röck, Eva Gabriela (2025). Conductivity of doped organic semiconductors: Insights from THz time-domain spectroscopy. (Thesis). Universität Bern, Bern
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Abstract
Organic semiconductors have emerged as materials that combine the properties of organic molecules and electronics. They are easy to process in solution, provide chemical tunability, are flexible, lightweight, semi-transparent, and bio-compatible, which opens the door to electronics with those properties. Doping is a pivotal method to modulate the conductivity of these materials by inducing charge carriers. Yet, a comprehensive understanding of the conductivity, its origin, potential and limits, remains elusive. This thesis explores the conductivity in doped organic semiconductors, providing innovative and original insights through the application of ultrafast spectroscopy. By employing terahertz (THz) time-domain spectroscopy and optical pump–THz probe spectroscopy, this work investigates the frequency dependent complex conductivity of organic semiconductor and organic–inorganic hybrid semiconductor films. Three recent achievements in enhanced conductivity are highlighted in the chapters. The incorporation of glycolated side-chains in conjugated polymers leads to enhanced conductivity which originates from an increased mobility of charges. The use of the strong oxidant Magic Blue and anion exchange doping leads to a higher number of charges, while also enabling higher mobility via recrystallisation. And lastly, the development of non-fullerene acceptor molecules for efficient charge transfer in hybrid materials and generation of mobile charges in optoelectronics. Hence, this thesis presents relevant and novel investigations that aim to ultimately advance the conductivity of organic electronics.
| Item Type: | Thesis |
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| Dissertation Type: | Cumulative |
| Date of Defense: | 31 March 2025 |
| Subjects: | 500 Science > 540 Chemistry |
| Institute / Center: | 08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
| Depositing User: | Hammer Igor |
| Date Deposited: | 30 Sep 2025 15:21 |
| Last Modified: | 10 Oct 2025 07:47 |
| URI: | https://boristheses.unibe.ch/id/eprint/6750 |
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