Light Quasiparticles Dominate Electronic Transport in Molecular Crystal Field-Effect Transistors

Z. Q. Li, V. Podzorov, N. Sai, M. C. Martin, M. E. Gershenson, M. Di Ventra, and D. N. Basov

Phys. Rev. Lett. 99, 016403 – Published 6 July 2007

Abstract

We report on an infrared spectroscopy study of mobile holes in the accumulation layer of organic field-effect transistors based on rubrene single crystals. Our data indicate that both transport and infrared properties of these transistors at room temperature are governed by light quasiparticles in molecular orbital bands with the effective masses $m^{⋆}$ comparable to free electron mass. Furthermore, the $m^{⋆}$ values inferred from our experiments are in agreement with those determined from band structure calculations. These findings reveal no evidence for prominent polaronic effects, which is at variance with the common beliefs of polaron formation in molecular solids.

Received 1 March 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.016403

Authors & Affiliations

Z. Q. Li^1,*, V. Podzorov², N. Sai^1,3, M. C. Martin⁴, M. E. Gershenson², M. Di Ventra¹, and D. N. Basov¹

¹Department of Physics, University of California, San Diego, La Jolla, California 92093, USA
²Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
³Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA
⁴Advanced Light Source Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

^*Electronic address: zhiqiang@physics.ucsd.edu

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Vol. 99, Iss. 1 — 6 July 2007

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