Real-Time Tracking of Singlet Exciton Diffusion in Organic Semiconductors.
Phys Rev Lett
; 116(5): 057402, 2016 Feb 05.
Article
em En
| MEDLINE
| ID: mdl-26894732
ABSTRACT
Exciton diffusion in organic materials provides the operational basis for functioning of such devices as organic solar cells and light-emitting diodes. Here we track the exciton diffusion process in organic semiconductors in real time with a novel technique based on femtosecond photoinduced absorption spectroscopy. Using vacuum-deposited C_{70} layers as a model system, we demonstrate an extremely high diffusion coefficient of D≈3.5×10^{-3} cm^{2}/s that originates from a surprisingly low energetic disorder of <5 meV. The experimental results are well described by the analytical model and supported by extensive Monte Carlo simulations. The proposed noninvasive time-of-flight technique is deemed as a powerful tool for further development of organic optoelectronic components, such as simple layered solar cells, light-emitting diodes, and electrically pumped lasers.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2016
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Article