Formation of Organic Nanodots with a Minimum Diameter of 40 nm Using Conventional Vacuum Vapor Deposition

Abstract

Conventional vacuum deposition onto a substrate coated with a self-assembled monolayer (SAM) was used to produce arrays of hemispherical nanostructures composed of organic semiconducting materials with low molecular weight. The nanostructures had a minimum diameter of 40 nm, indicating that cluster formation occurred in the gas phase during vacuum deposition. The size and shape of the nanostructures were controlled by the underlying SAMs, organic semiconducting materials, film thickness and substrate temperature.

Formation of Organic Nanodots Using Diamine Derivative and Self-Assembled Monolayer

“…In recent years, controlling nanostructures in organic semiconductor devices has been paid great attention. For example, Nakata et al reported that formation of organic nanodots composed of organic semiconductor materials with low molecular weight using a vacuum deposition on SiO2/Si wafers treated with hexamethyldisilazane (HMDS) [1]. And Karthaus et al reported that formation of organic (sub)micrometer-sized domes of tolyl-phenyl-diaminobi phenyl (TPD) using dewetting process on an indium-tin-oxide electrode [2].…”

Charge Carrier Mobilities in Amorphous Triphenylamine–Fluorene Copolymers: Role of Triphenylamine Unit in Intra- and Intermolecular Charge Transport

“…Among the large class of semiconducting organic conjugated polymers, triphenylamine (TPA) and fluorene (FL)-based copolymers occupy a unique place in OLEDs [1][2][3][4] and organic photovoltaic cells (OPVcs), 5,6) because the TPA is an efficient hole transporting unit (i.e., it acts as a donor). Thanks to this, analogous molecules, for instance, N,N 0 -diphenyl-N,N 0bis(3-methylphenyl)-(1,1 0 -biphenyl)-4,4 0 -diamine (TPD), [6][7][8] N,N 0 -bis(1-naphthyl)-N,N 0 -diphenylbenzidine (-NPD), 9,10) and TPA dendrimers 11,12) have been utilized as a hole transport layer in OLEDs.…”

Formation of Organic Nanodots on Indium Tin Oxide Using Molecular Aggregation during Self-Assembled Monolayer-Treatment Method

“…In a paper on organic nanodots using a diamine derivative, Nakata et al reported the formation of organic nanodots composed of N,N 0 -bis(3-methylphenyl)-N,N 0bis(phenyl)-benzidine (TPD) using vacuum deposition on SiO 2 /Si wafers treated with hexamethyldisilazane (HMDS). 10) In the above reports, smooth substrates such as Si and glass are used because it is generally difficult to control the formation of nanodots on a substrate with a rough surface, such as ITO. However, Karthaus et al reported the formation of organic (sub)micron-sized domes of TPD using a dewetting process on ITO electrodes.…”