Light quasiparticles dominate electronic transport in molecular crystal field-effect transistors

Journal Article · Thu Mar 01 00:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.99.016403· OSTI ID:937495

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

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[small star, filled]comparable to free electron mass. Furthermore, the m[small star, filled]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.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: Advanced Light Source Division
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 937495
• Report Number(s): LBNL-979E
• Journal Information: Physical Review Letters, Vol. 99; Related Information: Journal Publication Date: July 6, 2007
• Country of Publication: United States
• Language: English

Related Subjects

75
36
Rubrene
Infread
FET
organic
effective mass