Introduction

Optical properties of pentacene and perfluoropentacene thin films

“…For organic electronics in general and organic field effect transistors in particular pentacene (C 22 H 14 , PEN) is the most popular compound 1,2 , although there are many materials and compounds to choose from, and it is not entirely obvious why PEN would actually have to be the best choice. Possible alternatives to PEN may be, e.g., rubrene, which has its own structural subtleties 3,4,5 and diindenoperylene, which exhibits excellent structural order 6,7,8,9 . Another option is to stay with the PEN backbone and study modifications of PEN.…”

Probing Local Electronic Transport at the Organic Single‐Crystal/Dielectric Interface

“…We here demonstrate that scanning Kelvin probe microscopy [17] (SKPM), an atomic force microscopy (AFM)-based potentiometric technique, [18] allows for an in-depth exploration of the local electrical potential at the organic/dielectric interface in sub-lm thick organic single-crystals (OSCs), [16] opening novel perspectives for a deeper understanding of intrinsic charge transport and interfacial effects in semi-conducting singlecrystals. [7,19,20] Electrical ( Fig. 1) and SKPM (Figs.…”

“…Applying this approach to other sub-lm thick molecular [9,[19][20] and polymeric [26] OSCs on various gate dielectrics, [12,14] down to low temperatures, [4][5]27] should fasten the full understanding of underlying physics and its relation to ultimate SCOFETs performances.…”

“…1) and SKPM (Figs. 2 and 3) investigations were carried out at ambient conditions on electrostatically bonded sub-lm thick rubrene single-crystals on Si back-gated FET structures with SiO 2 dielectric and metal source-drain contacts recessed in the oxide (see the Experimental section).[21] A member of the oligoacene family, [20] e.g., rubrene, was chosen as a model organic semiconductor, both for its high charge carrier mobility values and for its low sensitivity to contamination by oxygen in ambient conditions. The quality of rubrene single-crystals [22,23] was confirmed by polarized optical microscopy (POM) experiments [10,16] for which large birefringence effects were observed under cross-polarised light and by AFM characterisations of the surface morphology which displays flat terraces with single mono-layers steps (Fig.…”

Structure and Morphology of Organic Semiconductor–Nanoparticle Hybrids Prepared by Soft Deposition

“…20 A thorough understanding of their growth and structure is prerequisite to the efficient implementation on a technological basis, since the morphology of OSCs has a strong impact on their charge carrier mobility and other physical properties. 1,[20][21][22][23][24][25][26][27][28][29][30] The basic understanding has largely remained on a qualitative level, since in most cases the film structure is not sufficiently well defined due to complex structural phenomena such as phase coexistence, changes in the molecular conformation or orientation, and morphological transitions. Thus there is the avid need to comprehend the different structural aspects of the hybrid structures like, e.g.…”