Congratulations to NUS High School students, Chloe and Luis, for completing a highly multidisciplinary project in ACTAlab. They built and programmed a Kretschmann prism coupling system, and then used it to analyse the cancer biomarker sensing ability of our Black Silver material.
Congratulations to Jitendra Behera. His paper describes how the electrical resistance of crystalline phase change data storage materials can change on a nanosecond times scales without changing phase. This discovery may enable universal memories to be realised.
Our paper on the evolutionary design of interfacial phase change superlattices has been accepted for publication in RSC Nanoscale. See the just accepted paper here.
Congratulations to ACTAlab PhD student, Ms Weiling Dong, for winning the best poster award at the EPCOS conference, which was held at Trinity College, Cambridge, UK 5th-6th Sept. Weiling’s poster discusses the combination of plasmonic nanogratings and the phase change material Ge2Sb2Te5 to create structural colour. More details of Weiling’s work can be found here.
Today, Xilin Zhou’s paper, which discusses how oxygen doping influences the the local structure of GeTe, has been published in ACS Applied Materials and Interfaces.
Interestingly when oxygen is added into GeTe, the energy required to switch the material in a phase change random access memory cell is lowered, yet counter intuitively the crystallization temperature is increased by O doping. Previously we showed that there is zero change in density for O concentrations of about 5 at.%. We believe that this allows the material to be switched with a lower enthalpy change, hence explaining the energy efficient memory switching.
The paper is available here: http://pubs.acs.org/doi/abs/10.1021/acsami.6b05071
Weiling Dong, Jitendra Behera, and Rob Simpson will present three papers at EPCOS 2016 in Cambridge, UK. The conference will be held in September 2016.
The papers are:
- Wideband visible absorbers by Ge2Sb2Te5 and Al nanogratings, Weiling Dong, Yimei Qiu, Joel K.W. Yang, Robert E. Simpson, and Tun Cao
- Laser switching of nanostructured phase change materials, Jitendra K. Behera, Xilin Zhou, and Robert E. Simpson
- Genetic algorithm inspired design of Ge2Sb2Te5 structures, Robert E Simpson, Janne Kalikka, Jitendra K Behera, Giacomo Nannicini and Xilin Zhou
See you in Cambridge!
Our paper on the design of strain engineered chalcogenide superlattices has been published in Nature Communications. The paper presents the design rules for creating superlattices with switchable properties.
Ms Weiling Dong successfully passed her qualifying exam. Congratulations. She will now continue her research into chalcogenide materials actively tuned photonics.
Kaitlyn Mullin will be researching self organised dispersions of micropartcicles
Kiara Cui will be researching methods to screen chalcogenides for applications in photonics
Nina Anwar will be investigating the threshold switching effect in amorphous chalcogenide thin films.
Weiling Dong et al. has publsihed a paper in the Journal of Physical Chemistry C which describes how plasmonic nanogratings can be combined with phase change materials to create strong absorption in the visible spectrum. Weiling explained that the simple design of her structure will enable mass production of these super absorbers.
The research was conducted in collaboration with Prof Tun Cao of Dalian University of Technology, China.
ACTAlab is developing tuneable optical filters based on chalcogenides for a wide range of applications from displays to pollution detectors.