ACS Nano
ACS Nano
5 years ago

Lithographically Patterned Functional Polymer–Graphene Hybrids for Nanoscale Electronics

Lithographically Patterned Functional Polymer–Graphene Hybrids for Nanoscale Electronics
Hadas Alon, Doron Naveh, Ryan Selhorst, Moshe Kirshner, Chen Stern, Raymond Gasper, Todd Emrick, Ashwin Ramasubramaniam, Michal Wasserman, Ofer Sinai
Two-dimensional (2D) materials are believed to hold significant promise in nanoscale (opto)electronics. While significant progress has been made in this field over the last decade, the ability to control charge carrier density with high spatial precision remains an outstanding challenge in 2D devices. We present an approach that simultaneously addresses the dual issues of charge-carrier doping and spatial precision based on a functional lithographic resist that employs methacrylate polymers containing zwitterionic sulfobetaine pendent groups for noncovalent surface doping of 2D materials. We demonstrate scalable approaches for patterning these polymer films via electron-beam lithography, achieving precise spatial control over carrier doping for fabrication of high-quality, all-2D, lateral p-n junctions in graphene. Our approach preserves all of the desirable structural and electronic properties of graphene, while exclusively modifying its surface potential. The functional polymer resist platform and concept offers a facile route towards lithographic doping of graphene- and other 2D materials-based optoelectronic devices.

Publisher URL: http://dx.doi.org/10.1021/acsnano.7b08844

DOI: 10.1021/acsnano.7b08844

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