@phdthesis{Lundt2019,
  author    = {Lundt, Nils},
  title     = {Strong light-matter coupling with 2D materials},
  doi       = {10.25972/OPUS-18733},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-187335},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2019},
  abstract  = {This publication is dedicated to investigate strong light-matter coupling with excitons in 2D materials. This work starts with an introduction to the fundamentals of excitons in 2D materials, microcavities and strong coupling in chapter 2. The experimental methods used in this work are explained in detail in chapter 3. Chapter 4 covers basic investigations that help to select appropriate materials and cavities for the following experiments. In chapter 5, results on the formation of exciton-polaritons in various materials and cavity designs are presented. Chapter 6 covers studies on the spin-valley properties of exciton-polaritons including effects such as valley polarization, valley coherence and valley-dependent polariton propagation. Finally, the formation of hybrid-polaritons and their condensation are presented in chapter 7.},
  subject      = {Exziton-Polariton},
  language  = {en}
}
@phdthesis{HechtgebWagener2019,
  author    = {Hecht [geb. Wagener], Reinhard Johannes},
  title     = {Processing and Characterization of Bulk Heterojunction Solar Cells Based on New Organic n-Type Semiconductors},
  doi       = {10.25972/OPUS-16138},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-161385},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2019},
  abstract  = {This thesis established the fabrication of organic solar cells of DA dye donors and fullerene acceptors under ambient conditions in our laboratory, however, with reduced power conversion efficiencies compared to inert conditions. It was shown that moisture had the strongest impact on the stability and reproducibility of the solar cells. Therefore, utilization of robust materials, inverted device architectures and fast fabrication/characterization are recommended if processing takes place in air. Furthermore, the dyad concept was successfully explored in merocyanine dye-fullerene dyads and power conversion efficiencies of up to 1.14 \% and 1.59 \% were measured under ambient and inert conditions, respectively. It was determined that the major drawback in comparison to comparable BHJ devices was the inability of the dyad molecules to undergo phase separation. Finally, two series of small molecules were designed in order to obtain electron transport materials, using the acceptor-core-acceptor motive. By variation of the acceptor units especially the LUMO levels could be lowered effectively. Investigation of the compounds in organic thin film transistors helped to identify promising molecules with electron transport properties. Electron transport mobilities of up to 7.3 × 10-2 cm2 V-1 s-1 (ADA2b) and 1.39 × 10-2 cm2 V-1 s-1 (AπA1b) were measured in air for the ADA and AπA dyes, respectively. Investigation of selected molecules in organic solar cells proved that these molecules work as active layer components, even though power conversion efficiencies cannot compete with fullerene based devices yet. Thus, this thesis shows new possibilities that might help to develop and design small molecules as substitutes for fullerene acceptors.},
  subject      = {Heterosolarzelle},
  language  = {en}
}