Journal
PHYSICAL REVIEW B
Volume 85, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.035313
Keywords
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Funding
- Grants-in-Aid for Scientific Research [23686005] Funding Source: KAKEN
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Temperature dependence of the Hall effect is measured for both single-crystal and thin-film field-effect transistors of pentacene. At room temperature, the inverse Hall coefficient 1/R(H) exceeds field-induced charge density Q by a factor of 2 at each gate-electric field for all the samples, regardless of their charge-carrier mobility and detailed subthreshold properties. Violating the band-transport model that 1/R(H) equals to Q, the excess 1/R(H) does not measure the charge amount anymore so that the result possibly indicates insufficient electromagnetic coupling due to somewhat reduced charge coherence. At lower temperatures, the deviation of 1/R(H) from Q gradually diminishes to approach the band-transport behavior. Interestingly, the degree of the deviation has been universal for the measured five samples, including both polycrystal and single-crystal pentacene films. The result suggests that significant molecular fluctuation near room temperature can affect the fundamental electronic state.
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