MRS Meetings and Events


NM06.13.04 2022 MRS Fall Meeting

Continuous Liquid Metal Printed 2D TCO Superlattices

When and Where

Dec 2, 2022
2:15pm - 2:30pm

Hynes, Level 2, Room 207



William Scheideler1,Youxiong Ye1,Andrew Hamlin1,Md Saifur Rahman1,Julia Huddy1

Dartmouth College1


William Scheideler1,Youxiong Ye1,Andrew Hamlin1,Md Saifur Rahman1,Julia Huddy1

Dartmouth College1
Two-dimensional (2D) conducting metal oxides offer unprecedented control of thin film electrostatics at the nanoscale. We present a scalable, roller-based continuous liquid metal printing (CLMP) approach for fabricating large area (100 cm<sup>2</sup>) layered transparent conductive oxides (TCOs) via rapid low-temperature Cabrera-Mott oxidation of compliant liquid metals (Ga, In). We exploit repeating heterostructures of these 2D oxides (3 nm per layer) to produce TCOs at 180 °C with record conductivity while simultaneously raising visible range transmittance above 98%. HRTEM and XRD characterization reveal the unique 2D film morphology consisting of large grained cubic InO<sub>x</sub> layered with amorphous GaO<sub>x</sub>. To investigate the impact of modulation doping at the type I heterojunction between InO<sub>x</sub> / GaO<sub>x</sub>, we also present XPS, UV-Vis, and Hall characterization. Our rapid (6 m / min) low-temperature CLMP approach yields flexible TCOs that demonstrate 20X enhanced strain tolerance while requiring zero post-annealing and offering greater conductivity than low-temperature ITO, which is limited by poor dopant activation. These capabilities establish CLMP 2D TCOs as a promising set of transparent electrode materials for flexible optoelectronic devices such as photodetectors and displays.


2D materials | electrical properties

Symposium Organizers

Nicholas Glavin, Air Force Research Laboratory
Aida Ebrahimi, The Pennsylvania State University
SungWoo Nam, University of California, Irvine
Won Il Park, Hanyang University

Symposium Support


Publishing Alliance

MRS publishes with Springer Nature