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Materials Research Institute



Plastic nanoscale electronics via novel fabrication paradigms, with Dr Dimitra G. Georgiadou, Imperial College London

Image: Dr Dimitra G. Georgiadou
Dr Dimitra G. Georgiadou

Date: 9 March 2018   Time: 11:00 - 12:00

Adhesion lithography (a-Lith) is a novel nanopatterning technique that allows deposition of two metal electrodes in a coplanar geometry separated by a sub 15 nm nanogap. The attractiveness of this technique lies in the high yield, robust and low-cost manufacturing of thousands of electronic devices on the same rigid (glass, Si) or flexible (plastic, paper) substrate of any size. Both symmetric and asymmetric work function metals can be fabricated enabling different types of electronic devices, the performance of which can be favoured by the unique geometry of the sub-15 nm channel separating the two metals along with intelligent materials selection and engineering.

Herein, I will first present recent advances in a-Lith fabrication process, enabling versatile and tuneable manufacturing of metallic electrode nanogap structures. Then I will show how the evolution of these unique architectures combined with advanced materials processing and engineering concepts paved the way to radiofrequency (RF) p- and n-type diodes with large output currents, high AC-to-DC conversion efficiency and cut-off frequencies well within the GHz regime. Furthermore, I will demonstrate nanoscale light-emitting diodes (LEDs) based on solution-processed light-emitting materials as well as nanoscale photodetectors (PDs), spanning the whole spectrum from UV to NIR, with low operation voltage, high on/off ratio and fast photoresponse. These proof-of-concept applications highlight the tremendous potential of a-Lith to fabricate in a scalable manner opto/electronic devices with attractive characteristics.

1. D. J. Beesley et al., Sub-15-nm patterning of asymmetric metal electrodes and devices by adhesion lithography. Nature Communications 5, 3933 (2014).
2. D. G. Georgiadou, J. Semple, T. D. Anthopoulos, in SPIE Newsroom. (SPIE, 2017).
3. J. Semple et al., Radio Frequency Coplanar ZnO Schottky Nanodiodes Processed from Solution on Plastic Substrates. Small 12, 1993-2000 (2016).
4. G. Wyatt-Moon, D. G. Georgiadou, J. Semple, T. D. Anthopoulos, Deep Ultraviolet Copper(I) Thiocyanate (CuSCN) Photodetectors Based on Coplanar Nanogap Electrodes Fabricated via Adhesion Lithography. ACS Applied Materials & Interfaces 9, 41965-41972 (2017).

Location:  Nanoforce Seminar Room, Joseph Priestly Building, Mile End