Figure 5
(a) X-ray diffraction pattern represented in a reciprocal space map of a 50 nm thick pentacene thin film with two concomitant polymorphs. The substrate-induced (or thin film) phase and the Campbell phase are identified by red and white circles, respectively, representing the peak patterns calculated on the basis of their crystal structures. (Reproduced with permission by Springer Nature.) (b) Orientations of the pentacene molecules relative to the substrate surface for the Campbell phase (gray atoms) and for the substrate-induced phase (red atoms). |