LNNano - Brazilian Nanotechnology National Laboratory

Hybrid nanomembrane-based capacitors unveil the accumulation properties of molecular ensembles

P.A. Petrini, R.M.L. Silva, R.F. Oliveira, L. Merces and C.C. Bof Bufon*


Considerable advances in the field of molecular electronics have been achieved over the recent years. One persistent challenge, however, refers to the exploitation of the molecular properties of fully integrated electronic devices. The incorporation of molecular materials in devices is not a trivial task, as the typical electrical contacts are aggressive to the soft molecular nature. In this scenario, we report on hybrid capacitors based on nanomembranes (NMs) that encapsulate ultrathin molecular ensembles allowing the reliable investigation of the molecular dielectric properties. Hybrid NM-based capacitors composed of metallic electrodes, insulating Al2O3 layers, and CuPc molecular ensembles have been fabricated and evaluated. The ensemble accumulation properties were unveiled, and the dielectric constant of such delicate structures was first investigated as a function of the thickness at the nanoscale. As a decisive outcome, the NM-based platform has shown itself a viable strategy for the dielectric characterization of molecular ensembles by using an integrated, real device technology.

This article was published in Nanotechnology (IOPscience, DOI: 10.1088/1361-6528/ aabc44/meta). This project has been conducted in the Brazilian Nanotechnology National Laboratory (LNNano). The authors acknowledge CNPq, CAPES, and FAPESP (Project 2014/25979-2) for the financial support.