Research Highlights

Glass Transition Temperature from the Chemical Structure of Conjugated Polymers

2/7/2023

The Tg demarks the transition into a brittle glassy state, making its accurate prediction for conjugated polymers crucial for the design of soft, stretchable, or flexible electronics.

Glass Sponges Inspire Mechanically Robust Lattice

2/5/2023

The predominantly deep-sea hexactinellid sponges are known for their ability to construct remarkably complex skeletons from amorphous hydrated silica. Here, using a combination of finite element simulations and mechanical tests on 3D-printed specimens of different lattice geometries, we show that the sponge’s diagonal reinforcement strategy achieves the highest buckling resistance for a given amount of material.

Atomic dynamics in superionic argyrodite Ag8SnSe6

1/1/2023 | Olivier Delaire

Our results provide fundamental insights into the complex atomic dynamics in superionic materials for energy conversion and storage.

Machine-learning Spectral Indicators of Topology

10/1/2022

Topological materials are promising for next-generation energy and information applications. However, the experimental determination of topology can be painstaking, with a few limitations such as limited sample types, high technical barriers, and limited sample environment.

Composition Gradient High-Throughput Polymer Libraries Enabled by Passive Mixing and Elevated Temperature

7/1/2022

High-throughput experimentation (HTE) methods are key to enabling informatics-driven workflows to accelerate discovery of high-performance multicomponent materials. Here, we designed a solution coating system able to operate at temperatures over 110 °C to deposit composition gradient polymer libraries. The methodology provides an avenue for efficiently screening multiparameter spaces of a wide range of materials relevant to today’s applications.

Ultra-low Temperature Synthesis of Ge-based Optical Materials and Devices on Si using GeH3Cl

1/1/2022 | A. X. Zhang, M. A. Mircovich, D. A. Ringwala, C. D. Poweleit, M. A. Roldan, J. Menendez, and J. Kouvetakis

To demonstrate the quality of the Ge layers grown via the chlorogermane route, we fabricated pin diodes and measured their I-V characteristics and optical responsivity and found them to be comparable or better to those obtained with alternative low-temperature precursors. This bodes well for the use of chlorogermane in industrial efforts to integrate Ge functionalities with silicon CMOS.

Excitonic Effects at the Direct Bandgap of Germanium

1/1/2022 | C. Emminger, N. S. Samarasingha, M. R. Arias, F. Abadizaman, J. Menendez, and S. Zollner

The divergence of the indirect absorption leads to the paradoxical conclusion that in the immediate vicinity of the direct gap, indirect absorption could become stronger than direct absorption. Eliminating this inconsistency requires a new theory of indirect absorption, which is one of the primary goals of this DMREF project.

Efficient Electromagnetic Shields in the GHz and Sub-THz Frequency Bands

1/1/2021 | Z. Barani, F. Kargar, Y. Ghafouri, S. Ghosh, K. Godziszewski, S. Baraghani, Y. Yashchyshyn, G. Cywinski, S. Rumyantsev, T. T. Salguero, and A. A. Balandin

These novel films are promising for high-frequency communication technologies, which require electromagnetic shielding films that are flexible, lightweight, corrosion resistant, inexpensive, and electrically insulating.

SrNbO3 as Transparent Conductor in the Visible and UV

6/1/2020

It has been a long-standing challenge to find a material that combines the mutually exclusive properties of high electrical conductivity and high optical transmission in the visible, and even harder, in the ultraviolet spectrum. A new class of transparent conductors – correlated metals – was recently discovered and found suitable.

SrNbO3 as Transparent Conductor in the Visible and UV

6/1/2020

It has been a long-standing challenge to find a material that combines the mutually exclusive properties of high electrical conductivity and high optical transmission in the visible, and even harder, in the ultraviolet spectrum. A new class of transparent conductors – correlated metals – was recently discovered and found suitable.