Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 9, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3332577
Keywords
annealing; copper; diffusion; energy gap; exponential distribution; Gaussian distribution; molecular electronic states; organic compounds; organic semiconductors; organic-inorganic hybrid materials; semiconductor thin films; ultraviolet photoelectron spectra
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Funding
- MEXT
- JSPS [20245039, 20656002]
- Futaba Electronics Memorial Foundation
- Grants-in-Aid for Scientific Research [20245039, 20656002] Funding Source: KAKEN
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The impact of 1 atm N(2) gas exposure on the electronic states of copper phthalocyanine thin films was investigated using ultrahigh-sensitivity ultraviolet photoelectron spectroscopy. The highest occupied molecular orbital band of the film showed a drastic reversible change in the bandwidth and band shape as well as in the energy position upon repeated cycles of N(2) exposure and subsequent annealing. Furthermore, two types of gap-state densities with Gaussian and exponential distributions appeared after the exposure and disappeared due to the annealing. These changes are ascribed to a weak disorder in the molecular packing structure induced by N(2) diffusion into the film.
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