Ubiquitous organic molecule-based free-standing nanowires with ultra-high aspect ratios

Abstract

The critical dimension of semiconductor devices is approaching the single-nm regime, and a variety of practical devices of this scale are targeted for production. Planar structures of nano-devices are still the center of fabrication techniques, which limit further integration of devices into a chip. Extension into 3D space is a promising strategy for future; however, the surface interaction in 3D nanospace make it hard to integrate nanostructures with ultrahigh aspect ratios. Here we report a unique technique using high-energy charged particles to produce free-standing 1D organic nanostructures with high aspect ratios over 100 and controlled number density. Along the straight trajectory of particles penetrating the films of various sublimable organic molecules, 1D nanowires were formed with approximately 10~15 nm thickness and controlled length. An all-dry process was developed to isolate the nanowires, and planar or coaxial heterojunction structures were built into the nanowires. Electrical and structural functions of the developed standing nanowire arrays were investigated, demonstrating the potential of the present ultrathin organic nanowire systems.

Electron‐Assisted Deposition‐Polymerization in Vacuum of Polymethines with Terminal Allyl Group

“…Different polymorphs have low energy of transformation between them, so the deposition conditions play an important role in the formation of the morphology. [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] The simultaneous formation of two polymorphs in a thin film of pentacene during PVD was discovered. [48] The almost isoenergetic states of several polymorphs of different dyes were emphasized.…”

“…[45] Various aggregations of cyanine dyes on different substrates have been discussed. [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] One phase can seed another phase. [47] The formation of a solid from pentacene molecules began from a flatly lying molecular layer on most of the substrates.…”

“…Self-assembled organic structures, including NWs, have been produced by various methods. [25][26][27][28][29][30][31] Usually NWs begin nucleating and growing from a predetermined site. The second end of the NW has to be connected with another material with an additional procedure.…”

Enhanced terahertz emission from mushroom-shaped InAs nanowire network induced by linear and nonlinear optical effects

“…Structural controlled semiconductors are an accessible and practical method to improve their THz emission performance. For example, nanowires (NWs) have shown electrical and optical properties due to their unique onedimensional structure [18][19][20]. As a THz emission material, semiconductor NWs have attracted great research attention because their low dimensional structure and large surface-to-volume ratio can break through the total-internal reflection limitation of the THz radiation generated by dipole radiation in bulk materials [21,22], thus increasing the THz emission efficiency.…”