Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 24, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3274135
Keywords
amorphous state; electron mobility; electronic structure; organic compounds; thin films; vacuum deposited coatings
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Funding
- Ministry of Education, Culture, Sports, Science, and Technology of Japan
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To demonstrate the effect of molecular orientation on charge transport characteristics in vacuum-deposited organic amorphous films, the electrical and optical properties of films of two oxadiazole derivatives were investigated. One of them has bulky tert-butyl terminals and forms an isotropic film, whereas the other has planar bipyridyl terminals and forms a highly anisotropic film. The very large optical anisotropy of the latter means that the planar molecules stack horizontally, leading to large overlaps of pi-orbitals and more than 30 times higher electron mobility though the geometric and electronic structures of the main conformers of the two derivatives are quite similar.
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