Designer Chalcogenides
February 13th, 2019 ROBERT E. SIMPSON Singapore University of Technology and Design (SUTD)

Phase change materials have important applications in photonics and data storage. However, new phase change materials must be discovered, designed, and optimized to overcome (1) the high switching energy, (2) the low cycleability, and (3) the high optical absorption. Although phase change chalcogenides of the GeTe-Sb2Te3 family have been successfully applied to both electrical and optical data storage, their high switching energy and optical absorption limits their application in visible photonics devices. We have used a combination of strain engineering, evolutionary algorithm-led crystal structure optimization, statistical experiment designs, and high throughput combinatorial materials screening to search, design, and optimize phase change materials. In particular, we discovered that Sb2S3 exhibits superior properties for reprogrammable and tunable photonics in the visible and near-infrared spectrum. In this talk I will discuss our phase change chalcogenide materials design approach, and show how these methods have allowed us to demonstrate prototype phase change data storage and tunable photonics devices with low switching energies and low optical absorption respectively.

Seminar, February 13, 2019, 15:00. ICFO’s Seminar Room

Hosted by Simon Wall