Facet-Selective Growth of Organic Heterostructured Architectures via Sequential Crystallization of Structurally Complementary π-Conjugated Molecules

Abstract

In contrast to those for their polymeric counterparts, the controlled construction of organic heterostructured architectures derived from π-conjugated organic molecules has been rare and remains a great challenge. Herein, we develop a simple single-step solution strategy for the realization of organic heterostructures comprising coronene and perylene. Under a sequential crystallization process, an efficient doping step for coronene and perylene domains enables their perfect lattice matching, which facilitates facet-selective epitaxial growth of perylene domains on both the tips and the side surfaces of the preformed seed microwires by manipulating the growth pathways of the two pairs of materials. The present synthetic route provides a promising platform to investigate the detailed formation mechanism of complex organic heterostructures with specific topological configurations, further directing the construction of more functional heterostructured materials.

Hierarchical self-assembly of organic heterostructure nanowires

“…The surface energy of the lateral-crystal-faces (Supplementary Table 4: E surf {011}s (26.2 kcal mol −1 ) ≤ E surf lateral-crystal-faces ≤ E surf {40-2}s (161.9 kcal mol −1 )) in the equilibrium morphology of DPEpe-BrFTA cocrystal for thermodynamic equilibrium (Fig. 3i) is as least as four-folds larger than that (8.1 kcal mol −1 ) of the top/bottom facets (002)s. The surface-interface energy balance also prefers DPEpe-F 4 DIB nucleation at the lateral facets to eliminate the unstable or high energy facets in DPEpe-BrFTA cocrystal, leading to the HG and thermodynamically favorable state, as in the case of b -TiO 2 -Fe x O y nanorods heterostructures 48 and coronene-perylene side surface growth heterostructures 17 . As a result, the surface-interface energy balance facilitates the HG of DPEpe-F 4 DIB on the side surfaces of the preformed DPEpe-BrFTA, which results into a core/shell structure under the thermodynamical equilibrium with a stock solution at high temperature.…”

“…The OSCs with the internal donor-acceptor heterojunction comprising poly(2-methoxy-5-(2’-ethyl-hexyloxy)-1,4-phenylenevinylene) (MEH-PPV) and fullerenes achieved higher efficiencies by more than two orders of magnitude than that of the devices made with pure MEH-PPV 14 . However, the simply physical mixing of electron donor/acceptor pairs for the formation of the OHSs usually give rise to the undesirable occurrence of phase separation and leads to poor performance 15–17 .…”

Tunable Emission Color and Morphology of Organic Microcrystals by a “Cocrystal” Approach

“…Organic optoelectronic devices tend to be miniaturized, highly integrated, and ultrafast transmissive, and these goals can be achieved by reducing the size of the materials and devices . Organic micro/nanocrystals have attracted widespread attention in recent years because of their unique physical and chemical properties . Additionally, these organic micro/nanocrystals have exhibited promising optoelectronic applications in organic field‐effect transistors, organic solid‐state lasers, optical waveguides, and sensors .…”

Color‐ and Dimension‐Tunable Light‐Harvesting Organic Charge‐Transfer Alloys for Controllable Photon‐Transport Photonics

“…The a-Pe contains four molecules per unit cell, arranged in as andwich-herringbonem otif (Figure 1c). [40][41][42][43] While DCA contains two -CN side groups,a rranged in an offset face-toface configuration due to intermolecular steric hindrance ( Figure 1d).…”