Graphene-enabled, directed nanomaterial placement from solution for large-scale device integration

TL;DR

This paper introduces a graphene-enabled electric-field technique for precise, large-scale placement of nanomaterials, overcoming chemical and electrode limitations, to facilitate mass manufacturing of nanoelectronic devices.

Contribution

The authors develop a residue-free, scalable graphene-based method for nanoscale placement of solution-processed nanomaterials, compatible with wafer-scale manufacturing.

Findings

Achieved nanoscale placement resolution over >1mm2 areas.

Successfully integrated various nanomaterials into nanoelectronic devices.

Demonstrated broad applicability across different dimensionalities of nanomaterials.

Abstract

Controlled placement of nanomaterials at predefined locations with nanoscale precision remains among the most challenging problems that inhibit their large-scale integration in the field of semiconductor process technology. Methods based on surface functionalization have a drawback where undesired chemical modifications can occur and deteriorate the deposited material. The application of electric-field assisted placement techniques eliminates the element of chemical treatment; however, it requires an incorporation of conductive placement electrodes that limit the performance, scaling, and density of integrated electronic devices. Here, we report a method for electric-field assisted placement of solution-processed nanomaterials by using large-scale graphene layers featuring nanoscale deposition sites. The structured graphene layers are prepared via either transfer or synthesis on standard substrates, then are removed without residue once nanomaterial deposition is completed, yielding material assemblies with nanoscale resolution that cover surface areas larger than 1mm2. In order to demonstrate the broad applicability, we have assembled representative zero-, one-, and two-dimensional semiconductors at predefined substrate locations and integrated them into nanoelectronic devices. This graphene-based placement technique affords nanoscale resolution at wafer scale, and could enable mass manufacturing of nanoelectronics and optoelectronics involving a wide range of nanomaterials prepared via solution-based approaches.