Effect of impurities on pentacene island nucleation

Details Effect of impurities on pentacene island nucleation Effect of impurities on pentacene island nucleation

2008-09-26

arxiv.org/abs/0809.4674v1

Phys. Rev. B 77, 205328 (2008)

Physics

Condensed Matter

Materials Science

16 Pages, 5 figures, 1 Table

Scientific paper

10.1103/PhysRevB.77.205328

Pentacenequinone (PnQ) impurities have been introduced into a pentacene source material in a controlled manner to quantify the relative effects of the impurity content on grain boundary structure and thin film nucleation. Atomic force microscopy (AFM) has been employed to directly characterize films grown using 0.0-7.5% PnQ by weight in the source material. Analysis of the distribution of capture zones areas of submonolayer islands as a function of impurity content shows that for large PnQ content the critical nucleus size for forming a Pn island is smaller than for low PnQ content. This result indicates a favorable energy for formation of Pn-PnQ complexes, which in turn suggests that the primary effect of PnQ on Pn mobility may arise from homogeneous distribution of PnQ defects.

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