Hund excitations and the efficiency of Mott solar cells
- Petocchi, Francesco Department of Physics, University of Fribourg, Switzerland
- Beck, Sophie Materials Theory, ETH Zurich, Switzerland
- Ederer, Claude Materials Theory, ETH Zurich, Switzerland
- Werner, Philipp Department of Physics, University of Fribourg, Switzerland
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26.08.2019
Published in:
- Physical Review B. - 2019, vol. 100, no. 7, p. 075147
English
We study the dynamics of photoinduced charge carriers in semirealistic models of LaVO3 and YTiO3 polar heterostructures. It is shown that two types of impact ionization processes contribute to the carrier multiplication in these strongly correlated multiorbital systems: The first mechanism involves local spin state transitions, while the second mechanism involves the scattering of high-kinetic-energy carriers. Both processes act on the 10-fs timescale and play an important role in the harvesting of high-energy photons in solar cell applications. As a consequence, the optimal gap size for Mott solar cells is substantially smaller than for semiconductor devices.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Physique
- Language
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- English
- Classification
- Physics
- License
- License undefined
- Identifiers
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- RERO DOC 327471
- DOI 10.1103/PhysRevB.100.075147
- Persistent URL
- https://folia.unifr.ch/unifr/documents/308223
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