Spin Fine Structure Reveals Biexciton Geometry in an Organic Semiconductor

K. M. Yunusova, S. L. Bayliss, T. Chanelière, V. Derkach, J. E. Anthony, A. D. Chepelianskii, L. R. Weiss

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


In organic semiconductors, biexcitons are key intermediates in carrier multiplication and exciton annihilation. Their local geometry governs their electronic properties and yet has been challenging to determine. Here, we access the structure of the recently discovered S=2 quintet biexciton state in an organic semiconductor using broadband optically detected magnetic resonance. We correlate the experimentally extracted spin structure with the molecular crystal geometry to identify the specific molecular pairings on which biexciton states reside.

Original languageEnglish
Article number097402
JournalPhysical Review Letters
Issue number9
StatePublished - Aug 28 2020

Bibliographical note

Funding Information:
We are thankful for insightful discussions with H. Bouchiat and R. H. Friend and acknowledge support from ANR SPINEX and Labex ANR-10-LABX-0039-PALM. L. R. W. acknowledges support from Clare College, Cambridge. The authors declare no competing financial interests.

Publisher Copyright:
© 2020 American Physical Society.

ASJC Scopus subject areas

  • Physics and Astronomy (all)


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