Abstract

We report the formation of rubrene crystalline films on Bi(001) substrate starting from the very first layer. With coverage increasing, rubrene shows a structural evolution from self-assembled monolayer to a composite phase, which consists of rubrene crystalline domains and self-assembled domain walls. In particular, Kurdjunov-Sachs (KS) rotational epitaxy has been found in rubrene crystalline domains, which reveal large compressive strains. Further deposition of rubrene leads to a layer-by-layer growth of crystalline films up to the fourth layer. The driving force for rubrene crystallinity in the monolayer regime has been attributed to the anisotropic strains generated in KS rotation epitaxy.

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