Wrap-around self-assembly of interspersed topological organic heterostructures based on multi-faceted alignment†

Abstract

Organic low-dimensional heterostructures, with unique optoelectronic properties and flexible material design, provide new material foundations and technical means for optical interconnects and integrated optoelectronics. However, achieving precisely organized organic low-dimensional heterostructures is limited by homogeneous nucleation and interface energy mismatch between different molecules. A wrap-around self-assembly strategy is proposed, utilizing multi-faceted alignment to construct interspersed topological organic low-dimensional heterostructures. Interspersed topological heterostructures with precise spatial organization from bottom to top were successfully fabricated by controlling the sequential nucleation and growth of different crystals through stepwise solution self-assembly. Multi-faceted lattice matching promotes effective structural integration between one-dimensional (1D) microgranules and two-dimensional (2D) microsheets with the ultralow lattice mismatch rates η of 0.7% and 0.3%, respectively. Notably, the unique serial arrangement of microrods and microsheets enables photon coupling from 1D to 2D. The dimensional cross-guide coupling process facilitates optical interconnection, leading to more efficient optical signal transmission and processing, thereby enhancing the performance of optical interconnect technologies in information communication and optoelectronic devices.