Fabrication of Highly Oriented Multilayer Films of Picene and DNTT on Their Bulklike Monolayer

Abstract

Highly oriented, multilayer molecular films of picene and dinaphtho[2,3- b :2′,3′- f ]thieno[3,2- b ]thiophene (DNTT) molecules with the long axis parallel to the substrate (parallel configuration, hereafter) were fabricated on their characteristic bulklike monolayer. These molecules form a dense monolayer with a bulklike molecular arrangement on metal surfaces such as Au(111), which allows further stacking of parallel molecules. Indeed, upon adsorption of picene and DNTT on these dense monolayers, growth of straight islands of multilayer without the dendritic layer was observed. Particularly, in the case of picene, one-dimensional islands with lengths over 100 μm were formed and aligned in 3-fold symmetric directions of the substrate, which was not observed in the case of DNTT. X-ray diffraction measurements revealed the presence of [201̅] and [211̅] planes and the absence of the [001] diffractions, indicating that the one-dimensional islands of picene indeed consist of parallel molecules. The formation of huge crystalline islands in the case of picene, in contrast to the case of DNTT, is likely induced by the stronger intermolecular force, as suggested from the calculation of the vibrational energy.

Picene and PTCDI based solution processable ambipolar OFETs

“…The measured hole mobility for the pristine picene ( D ) was 0.38cm 2 /Vs with good I on/off ratio of 10 5 , which is on par with the reports using various processing techniques 55 . The electron mobility of pristine C12-PTCDI ( A ) was up to 0.12 cm 2 /Vs with I on/off ratio of 10 4 (Fig.…”

Photoemission Tomography of a One-Dimensional Row Structure of a Flat-Lying Picene Multilayer on Ag(110)

“…The formation of such a zigzag structure has also been reported in a picene monolayer on Au(111), Ag(111), and Ag(100) substrates. 6,12,15,16 The unit cell size of the zigzag monolayer observed in this study is 1.1 nm × 1.3 nm, which is in good agreement with the zigzag structure observed on the picene monolayer on Au(111). 16 This type of monolayer seems to be common for molecules with strong intermolecular interactions such as picene and dinaphtho[2,3-b:2′3′-f ]thieno-[3,2-b]-thiophene (DNTT).…”

“…16 This type of monolayer seems to be common for molecules with strong intermolecular interactions such as picene and dinaphtho[2,3-b:2′3′-f ]thieno-[3,2-b]-thiophene (DNTT). 12,16,17 The STM measurements of the picene monolayer also showed the presence of mirror domains with respect to the [11̅ 0] axis of the substrate, which was also detected in the low-energy electron diffraction (LEED) pattern (as indicated by yellow and orange rectangles in Figure 1f).…”

Development of a high-precision XYZ translator and estimation of beam profile of the vacuum ultraviolet and soft X-ray undulator beamline BL-13B at the Photon Factory

“…Many of the interesting chemical/physical properties of materials often stem from the spatially inhomogeneous electronic structures at the micro/nano-scale, such as correlated materials that exhibit phase separation (Iwasawa et al, 2019;Lupi et al, 2010;Kondo et al, 2007), active catalysts on irregular surfaces (Zeradjanin et al, 2014;Picone et al, 2016), twodimensional layers of transition-metal chalcogenides , micro/nano-crystallites embedded in host materials (Lee et al, 2017), electronic functional organic microcrystalline materials (Lee et al, 2018;Sumi et al, 2019;Zhang et al, 2019), heterogeneous catalysts for organic synthesis (Grä tzel, 2009) and micro/nano-engineered thin devices (Picone et al, 2016;Fukuda & Someya, 2017). To study such local electronic structures, micro/nano-scale scanning microscopy measurements are desired, not only for ARPES but also for highresolution photoemission spectroscopy (HRPES) and X-ray photoemission spectroscopy (XPS) (Gü nther et al, 2002;Dudin et al, 2010;Avila et al, 2013;Rotenberg & Bostwick, 2014;Hoesch et al, 2017;Iwasawa et al, 2017aIwasawa et al, ,b, 2018Jacobsen, 2019).…”