Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3258351
Keywords
electronic density of states; energy gap; Fermi level; organic semiconductors; semiconductor thin films; ultraviolet photoelectron spectra
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Funding
- Global Center-of-Excellence program
- JSPS [A, 20245039, A, 20656002]
- Grants-in-Aid for Scientific Research [20656002, 20245039] Funding Source: KAKEN
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We detected a very low density of electronic states in the band gap of a nondoped pentacene thin film by using ultraviolet photoelectron spectroscopy with ultrahigh sensitivity and ultralow background. The gap states, which may originate from the highest occupied molecular orbital (HOMO) state in imperfect molecular packing regions, are distributed exponentially up to the Fermi level and control the Fermi level relative to the HOMO band.
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