Real-Time Tracking of Singlet Exciton Diffusion in Organic Semiconductors

Oleg V. Kozlov, Foppe De Haan, Ross A. Kerner, Barry P. Rand, David Cheyns, Maxim S. Pshenichnikov

Research output: Contribution to journalArticle

17 Scopus citations

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 C70 layers as a model system, we demonstrate an extremely high diffusion coefficient of D≈3.5×10-3 cm2/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.

Original languageEnglish (US)
Article number057402
JournalPhysical Review Letters
Volume116
Issue number5
DOIs
StatePublished - Feb 4 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Kozlov, O. V., De Haan, F., Kerner, R. A., Rand, B. P., Cheyns, D., & Pshenichnikov, M. S. (2016). Real-Time Tracking of Singlet Exciton Diffusion in Organic Semiconductors. Physical Review Letters, 116(5), [057402]. https://doi.org/10.1103/PhysRevLett.116.057402