Journalartikel
Autorenliste: Rangel, Tonatiuh; Rinn, Andre; Sharifzadeh, Sahar; da Jornada, Felipe H.; Pick, Andre; Louie, Steven G.; Witte, Gregor; Kronik, Leeor; Neaton, Jeffrey B.; Chatterjee, Sangam
Jahr der Veröffentlichung: 2018
Seiten: 284-289
Zeitschrift: Proceedings of the National Academy of Sciences
Bandnummer: 115
Heftnummer: 2
ISSN: 0027-8424
Open Access Status: Green
DOI Link: https://doi.org/10.1073/pnas.1711126115
Verlag: National Academy of Sciences
Abstract:
Organic materials are promising candidates for advanced optoelectronics and are used in light-emitting diodes and photovoltaics. However, the underlying mechanisms allowing the formation of excited states responsible for device functionality, such as exciton generation and charge separation, are insufficiently understood. This is partly due to the wide range of existing crystalline polymorphs depending on sample preparation conditions. Here, we determine the linear optical response of thin-film single-crystal perylene samples of distinct polymorphs in transmission and reflection geometries. The sample quality allows for unprecedented high-resolution spectroscopy, which offers an ideal opportunity for judicious comparison between theory and experiment. Excellent agreement with first-principles calculations for the absorption based on the GW plus Bethe-Salpeter equation (GW-BSE) approach of many-body perturbation theory (MBPT) is obtained, from which a clear picture of the low-lying excitations in perylene emerges, including evidence of an exciton-polariton stopband, as well as an assessment of the commonly used Tamm-Dancoff approximation to the GW-BSE approach. Our findings on this well-controlled system can guide understanding and development of advanced molecular solids and functionalization for applications.
Zitierstile
Harvard-Zitierstil: Rangel, T., Rinn, A., Sharifzadeh, S., da Jornada, F., Pick, A., Louie, S., et al. (2018) Low-lying excited states in crystalline perylene, Proceedings of the National Academy of Sciences, 115(2), pp. 284-289. https://doi.org/10.1073/pnas.1711126115
APA-Zitierstil: Rangel, T., Rinn, A., Sharifzadeh, S., da Jornada, F., Pick, A., Louie, S., Witte, G., Kronik, L., Neaton, J., & Chatterjee, S. (2018). Low-lying excited states in crystalline perylene. Proceedings of the National Academy of Sciences. 115(2), 284-289. https://doi.org/10.1073/pnas.1711126115
Schlagwörter
ABSORPTION-SPECTRA; BAND-GAPS; excited states; GREENS-FUNCTION; many-body perturbation theory; QUASI-PARTICLE
