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Popescu A, Younts RA, Hoffman B, et al. Monitoring Charge Separation Processes in Quasi-One-Dimensional Organic Crystalline Structures. Nano Lett. 2017;17(10):6056-6061doi: 10.1021/acs.nanolett.7b02471.
Popescu, A., Younts, R. A., Hoffman, B., McAfee, T., Dougherty, D. B., Ade, H. W., Gundogdu, K., & Bondarev, I. V. (2017). Monitoring Charge Separation Processes in Quasi-One-Dimensional Organic Crystalline Structures. Nano letters, 17(10), 6056-6061. https://doi.org/10.1021/acs.nanolett.7b02471
Popescu, Adrian, et al. "Monitoring Charge Separation Processes in Quasi-One-Dimensional Organic Crystalline Structures." Nano letters vol. 17,10 (2017): 6056-6061. doi: https://doi.org/10.1021/acs.nanolett.7b02471
Popescu A, Younts RA, Hoffman B, McAfee T, Dougherty DB, Ade HW, Gundogdu K, Bondarev IV. Monitoring Charge Separation Processes in Quasi-One-Dimensional Organic Crystalline Structures. Nano Lett. 2017 Oct 11;17(10):6056-6061. doi: 10.1021/acs.nanolett.7b02471. Epub 2017 Sep 11. PMID: 28873308.
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Nano Lett. 2017 Oct 11;17(10):6056-6061. doi: 10.1021/acs.nanolett.7b02471. Epub 2017 Sep 11.

Monitoring Charge Separation Processes in Quasi-One-Dimensional Organic Crystalline Structures.

Nano letters

Adrian Popescu, Robert A Younts, Benjamin Hoffman, Terry McAfee, Daniel B Dougherty, Harald W Ade, Kenan Gundogdu, Igor V Bondarev

Affiliations

  1. Department of Math and Physics, North Carolina Central University , Durham, North Carolina 27707, United States.
  2. Department of Physics and Engineering Physics, Tulane University , New Orleans, Louisiana 70118, United States.

PMID: 28873308 DOI: 10.1021/acs.nanolett.7b02471

Abstract

We perform the transient absorption spectroscopy experiments to investigate the dynamics of the low-energy collective electron-hole excitations in α-copper phthalocyanine thin films. The results are interpreted in terms of the third-order nonlinear polarization response function. It is found that, initially excited in the molecular plane, the intramolecular Frenkel exciton polarization reorients with time to align along the molecular chain direction to form coupled Frenkel-charge-transfer exciton states, the eigenstates of the one-dimensional periodic molecular lattice. The process pinpoints the direction of the charge separation in α-copper phthalocyanine and similar organic molecular structures. Being able to observe and monitor such processes is important both for understanding the physical principles of organic thin film solar energy conversion device operation and for the development of organic optoelectronics in general.

Keywords: Crystalline phthalocyanines; Frenkel excitons; charge-transfer excitons; polarization

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