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.
|Journal||Physical Review Letters|
|State||Published - Aug 28 2020|
Bibliographical noteFunding 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.
© 2020 American Physical Society.
ASJC Scopus subject areas
- Physics and Astronomy (all)