News
Amir Tavakkoli K.G. Receives Best Postdoc Presentation Award from the MRS Symposium Directed Self Assembly for Nanopatterning
Congrats to Dr. Amir Tavakkoli K.G. for receiving the Best Postdoc Presentation Award from the MRS Symposium Directed Self Assembly for Nanopatterning. This was given to Amir for his presentation “Formation of Multilayer Structure and Nanoscale Rectangular Mesh by Block Copolymer Self Assembly”. Congratulations to Amir.
New Patent on Self-Assembly Issued to QNN Group Members
A method developed by the QNN Group with collaborators promises a way to make complex two-dimensional patterns by using sparse lithography in combination with self-assembly. Such a technique could be useful for nanofabrication of integrated-circuit patterns, or patterns for solar cells, meta-materials, or other applications where complex two-dimensional nano-designs are needed. Congratulations to the authors JB Chang, Hong-Kyoon Choi, Adam Hannon, Caroline Ross, and Karl Berggren.
A copy of the patent can be found here.
New paper: “Control of zinc oxide nanowire array properties with electron-beam lithography templating for photovoltaic applications” accepted to Nanotechnology
[abstract] We found that electron-beam lithography, a top-down approach, is a suitable prototyping method for templating and controlling hydrothermally-grown ZnO nanowires (NWs). By varying the deposition method of the ZnO seed layer, annealing and template hole diameter, the branching and alignment parameters of the NW growth was determined. We uncovered the relationship between mutual impingement and template hole size, as well as found ideal growth parameters for well-aligned, single NWs. These results can allow for higher efficiency in ZnO NW-based solar cells.
nanotechweb.org highlighted this article in February 2015. It was also featured in the nanotechweb.org spring round-up.
The paper by Samuel M. Nicaise, Jayce J. Cheng, Amirreza Kiani, Silvija Gradečak, and Karl K. Berggren has been accepted to Nanotechnology and is currently open access here.
24-picosecond single-photon timing jitter in saturated SNSPDs – New Paper in IEEE Quantum Electronics
In our new paper, to appear in the IEEE Jornal of Selected Topics in Quantum Electronics (JSTQE), we have demonstrated fully-saturated nanowire single-photon detectors with 24 ps jitter. Furthermore we show an improved fabrication process that allowed us to increase the fabrication yield of our detectors.
The JSTQE preprint is available at doi:10.1109/JSTQE.2014.2372054
http://ieeexplore.ieee.org/
New paper: “Universal scaling of the critical temperature for thin films near the superconducting-to-insulating transition” accepted to Phys. Rev. B
[preprint] [supp. info.] We reported that the superconducting properties scale universally close to the superconducting-to-insulating transition in thin films. This universal behavior was found useful not only for the fundamental understanding of superconductivity near its onset, but also for miniaturized superconducting devices, such as superconducting-nanowire single-photon detectors.
MIT News highlighted this article in December 2014.
The paper by Yachin Ivry, Chung-Soo Kim, Andrew E. Dane, Domenico De Fazio, Adam McCaughan, Kristen A. Sunter, Qingyuan Zhao and Karl K. Berggren has been accepted to Phys. Rev B and is currently on the arXiv and in abstract.