Optical conductivity and optical effective mass in a high-mobility organic semiconductor: Implications for the nature of charge transport
Type
ArticleKAUST Department
KAUST Solar Center (KSC)Laboratory for Computational and Theoretical Chemistry of Advanced Materials
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Date
2014-12-03Permanent link to this record
http://hdl.handle.net/10754/555959
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Show full item recordAbstract
We present a multiscale modeling of the infrared optical properties of the rubrene crystal. The results are in very good agreement with the experimental data that point to nonmonotonic features in the optical conductivity spectrum and small optical effective masses. We find that, in the static-disorder approximation, the nonlocal electron-phonon interactions stemming from low-frequency lattice vibrations can decrease the optical effective masses and lead to lighter quasiparticles. On the other hand, the charge-transport and infrared optical properties of the rubrene crystal at room temperature are demonstrated to be governed by localized carriers driven by inherent thermal disorders. Our findings underline that the presence of apparently light carriers in high-mobility organic semiconductors does not necessarily imply bandlike transport.Citation
Optical conductivity and optical effective mass in a high-mobility organic semiconductor: Implications for the nature of charge transport 2014, 90 (24) Physical Review BPublisher
American Physical Society (APS)Journal
Physical Review BarXiv
1501.00098Additional Links
http://link.aps.org/doi/10.1103/PhysRevB.90.245112ae974a485f413a2113503eed53cd6c53
10.1103/PhysRevB.90.245112