Low-lying lattice modes of highly uniform pentacene monolayers

Rui He; Tassi, Nancy G.; Blanchet, Graciela B.; Pinczuk, Aron
June 2009
Applied Physics Letters;6/1/2009, Vol. 94 Issue 22, p223310
Academic Journal
The authors report that monolayers of pentacene grown on a functionalized polymeric substrate display high uniformity that enable observations of Raman spectra of low-lying optical vibrations. The evolution of the frequencies and widths of the modes has been studied in films reaching the single monolayer level. Raman spectra of low-lying lattice modes display major changes when the film thickness changes from 1 to 2 monolayers, revealing that a phase akin to a thin film phase of pentacene already emerges in films of only 2 monolayers.


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