Spectroscopic Study of Anisotropic Excitons in Single Crystal Hexacene.
The linear optical response of hexacene single crystals over a spectral range of 1.3-1.9 eV was studied using polarization-resolved reflectance spectroscopy at cryogenic temperatures. We observe strong polarization anisotropy for all optical transitions. Pronounced deviations from the single-molecule, solution-phase spectra are present, with a measured Davydov splitting of 180 meV, indicating strong intermolecular coupling. The energies and oscillator strengths of the relevant optical transitions and polarization-dependent absorption coefficients are extracted from quantitative analysis of the data.
†Departments of Physics and Electrical Engineering, Columbia University, New York, New York 10027, United States.
Alexey
A
Chernikov
†Departments of Physics and Electrical Engineering, Columbia University, New York, New York 10027, United States.
Omer
O
Yaffe
‡Department of Chemistry, Columbia University, New York, New York 10027, United States.
Bharat
B
Kumar
‡Department of Chemistry, Columbia University, New York, New York 10027, United States.
Yu
Y
Zhong
‡Department of Chemistry, Columbia University, New York, New York 10027, United States.
Colin
C
Nuckolls
†Departments of Physics and Electrical Engineering, Columbia University, New York, New York 10027, United States.
Tony F
TF
Heinz
Davydov splitting; hexcene; linear acene; solution-phase; spectroscopy