期刊
APPLIED PHYSICS LETTERS
卷 95, 期 18, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3258351
关键词
electronic density of states; energy gap; Fermi level; organic semiconductors; semiconductor thin films; ultraviolet photoelectron spectra
资金
- Global Center-of-Excellence program
- JSPS [A, 20245039, A, 20656002]
- Grants-in-Aid for Scientific Research [20656002, 20245039] Funding Source: KAKEN
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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