Amorphous-like Density of Gap States in Single Crystal Pentacene

Details Amorphous-like Density of Gap States in Single Crystal Pentacene Amorphous-like Density of Gap States in Single Crystal Pentacene

2003-12-31

arxiv.org/abs/cond-mat/0312722v1

Physics

Condensed Matter

Materials Science

14 pages, inc. figures

Scientific paper

10.1103/PhysRevLett.93.086802

We show that optical and electrical measurements on pentacene single crystals can be used to extract the density of states in the HOMO-LUMO bandgap. It is found that these highly purified crystals possess band tails broader than those typically observed in inorganic amorphous solids. Results on field effect transistors (FETs) fabricated from similar crystals are also compared. The FET data imply that the gap state density is much larger within 5-10 nm of the gate dielectric. These results are discussed in terms of both crystal phase domains and structural disorder mechanisms.

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