HOMO band structure and anisotropic effective hole mass in thin crystalline Pentacene films

Details HOMO band structure and anisotropic effective hole mass in thin crystalline Pentacene films HOMO band structure and anisotropic effective hole mass in thin crystalline Pentacene films

2009-07-29

arxiv.org/abs/0907.5191v2

R. C. Hatch et al., Phys. Rev. B 80, 081411(R) (2009)

Physics

Condensed Matter

Materials Science

20 pages, 4 figures, 1 table and appendix

Scientific paper

10.1103/PhysRevB.80.081411

The band dispersion of the two highest occupied molecular orbital (HOMO)-derived bands in thin crystalline Pentacene films grown on Bi(001) was determined by photoemission spectroscopy. Compared to first-principles calculations our data show a significantly smaller band width and a much larger band separation indicating that the molecular interactions are weaker than predicted by theory--a direct contradiction to previous reports by Kakuta et al. [Phys. Rev. Lett. 98, 247601 (2007)]. The effective hole mass m* at M-bar is found to be anisotropic and larger than theoretically predicted. Comparison of m* to field effect mobility measurements shows that the band structure has a strong influence on the mobility even at room temperature where we estimate the scattering rate to be tau ~3 fs.

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