Zobrazeno 1 - 10
of 110
pro vyhledávání: '"Frank Ortmann"'
Autor:
Gareth John Moore, Florian Günther, Kaila M. Yallum, Martina Causa’, Anna Jungbluth, Julien Réhault, Moritz Riede, Frank Ortmann, Natalie Banerji
Publikováno v:
Nature Communications, Vol 15, Iss 1, Pp 1-11 (2024)
Abstract The interconversion dynamics between charge transfer state charges (CTCs) and separated charges (SCs) is still an unresolved issue in the field of organic photovoltaics. Here, a transient absorption spectroscopy (TAS) study of a thermally ev
Externí odkaz:
https://doaj.org/article/3996875bfdd34f658cb0054f92a91d7a
Publikováno v:
npj 2D Materials and Applications, Vol 8, Iss 1, Pp 1-9 (2024)
Abstract The electrostatic potential within porous materials critically influences applications like gas storage, catalysis, sensors and semiconductor technology. Precise control of this potential in covalent organic frameworks (COFs) is essential fo
Externí odkaz:
https://doaj.org/article/f5470d5d043d410396232432937627a2
Autor:
Kai Müller, Karl S. Schellhammer, Nico Gräßler, Bipasha Debnath, Fupin Liu, Yulia Krupskaya, Karl Leo, Martin Knupfer, Frank Ortmann
Publikováno v:
Nature Communications, Vol 14, Iss 1, Pp 1-8 (2023)
Abstract Exciton bandwidths and exciton transport are difficult to control by material design. We showcase the intriguing excitonic properties in an organic semiconductor material with specifically tailored functional groups, in which extremely broad
Externí odkaz:
https://doaj.org/article/793dd35315694add9c20ebc1e6fdd56c
Publikováno v:
Communications Physics, Vol 6, Iss 1, Pp 1-8 (2023)
Abstract Various simulation approaches exist to describe charge transport in organic solids, offering significantly different descriptions of the physics of electron-phonon coupling. This variety introduces method-dependent biases, which inevitably r
Externí odkaz:
https://doaj.org/article/33b9476c6c7143e880c50f975e769cbf
Publikováno v:
Scientific Reports, Vol 13, Iss 1, Pp 1-15 (2023)
Abstract We investigate a family of hexagonal 2D covalent organic frameworks (COFs) with phenyl and biphenyl spacer units and different chemical linker species. Chemical trends are elucidated and attributed to microscopic properties of the $$\pi$$ π
Externí odkaz:
https://doaj.org/article/1082e5468d474813a2ef105ae44d7682
Publikováno v:
npj Computational Materials, Vol 8, Iss 1, Pp 1-11 (2022)
Abstract The modeling of charge transport in organic semiconductors usually relies on the treatment of molecular vibrations by assuming a certain limiting case for all vibration modes, such as the dynamic limit in polaron theory or the quasi-static l
Externí odkaz:
https://doaj.org/article/130056c549424bf79b9b05c05ab5c84a
Autor:
Michel Panhans, Sebastian Hutsch, Johannes Benduhn, Karl Sebastian Schellhammer, Vasileios C. Nikolis, Tim Vangerven, Koen Vandewal, Frank Ortmann
Publikováno v:
Nature Communications, Vol 11, Iss 1, Pp 1-10 (2020)
A steep absorption edge is preferred for high performance solar cells, but is less common for organic solar cells (OSCs). Here Panhans et al. find that the absorption tails are dominated by zero point vibrations and are responsible for the lowering o
Externí odkaz:
https://doaj.org/article/3d3c4ec1b7904a1fb3e1bff160a1b6f8
Autor:
Yufei Zhong, Martina Causa’, Gareth John Moore, Philipp Krauspe, Bo Xiao, Florian Günther, Jonas Kublitski, Rishi Shivhare, Johannes Benduhn, Eyal BarOr, Subhrangsu Mukherjee, Kaila M. Yallum, Julien Réhault, Stefan C. B. Mannsfeld, Dieter Neher, Lee J. Richter, Dean M. DeLongchamp, Frank Ortmann, Koen Vandewal, Erjun Zhou, Natalie Banerji
Publikováno v:
Nature Communications, Vol 11, Iss 1, Pp 1-10 (2020)
It has been commonly believed that the driving force at the donor-acceptor heterojunction is vital to efficient charge separation in organic solar cells. Here Zhong et al. show that the driving force can be as small as 0.05 eV without compromising th
Externí odkaz:
https://doaj.org/article/cda0d3993448476fa3d0fb5c0b9f32dd
Autor:
Konrad Merkel, Frank Ortmann
Publikováno v:
JPhys Materials, Vol 7, Iss 1, p 015001 (2023)
We present a theoretical method for calculating optical absorption spectra based on maximally localized Wannier functions, which is suitable for large periodic systems. For this purpose, we calculate the exciton Hamiltonian, which determines the Beth
Externí odkaz:
https://doaj.org/article/47281587b1764a448b610e07bd8c8186
Autor:
Martin Schwarze, Karl Sebastian Schellhammer, Katrin Ortstein, Johannes Benduhn, Christopher Gaul, Alexander Hinderhofer, Lorena Perdigón Toro, Reinhard Scholz, Jonas Kublitski, Steffen Roland, Matthias Lau, Carl Poelking, Denis Andrienko, Gianaurelio Cuniberti, Frank Schreiber, Dieter Neher, Koen Vandewal, Frank Ortmann, Karl Leo
Publikováno v:
Nature Communications, Vol 10, Iss 1, Pp 1-9 (2019)
The performance of organic semiconductor devices depends heavily on molecular parameters. Here, Schwarze et al. point out that the molecular quadrupole moment largely influences device energy levels and show how quadrupole moments can reduce the ener
Externí odkaz:
https://doaj.org/article/6b93d2e0a9134a73bd901b9197e273eb