The research focus “Emerging Electronics” encompasses today three major areas pertaining to life-science technologies and brain-inspired computing.
1. Nanodevices for DNA sequencing
Project leader: Shi-Li Zhang
Work package leaders: Zhen Zhang (nanofabrication), Klas Hjort (nanofluidics), Ralph Scheicher (ab initio simulations), Shi-Li Zhang (characterization and physics)
Other scientists: Chenyu Wen, Shuangshuang Zeng, Shiyu Li, Tomas Nyberg
Collaborations: Dr. Kai Arstila and Prof. Timo Sajavaara of Nanoscience Center at University of Jyväskylä, Finland; Prof. Gregory Schneider of Leiden University, the Netherlands; Paul Solomon of IBM Thomas J. Watson Research Center in New York.
External funding: VR, SOEB
The project explores novel device concepts for DNA sequencing. The nanodevices are silicon-based and have been fabricated in the cleanroom laboratory at Ångström. Theoretical modelling with a focus on strategies for signal enhancement and noise mitigation has been instrumental for our design and operation of nanopores and nanopore systems. Apart from our state-of-the-art electron-beam lithography system, we collaborate internationally for novel nanopore fabrication approaches. Advanced electrical characterization facilities have already been established.
2. Low-dimensionality materials for sensing and energy
Project leader: Shi-Li Zhang
Other scientists: Malkolm Hinnemo, Patrik Ahlberg, Tomas Nyberg, Zhi-Bin Zhang, Youwei Zhang
Collaborations: Prof. Ulf Jansson and Dr. Mikael Ottosson of Chemistry-Ångström; Prof. Zhijun Qiu of Fudan University, Shanghai
External funding: VR, KAW, SOEB
We have been exploring graphene as a novel electrode for ion sensing. The idea builds on a dual-mode, field-effect electronic device with which more information can be extracted in order to understand the surface adsorption and desorption that influence the sensing outcome. Emerging 2D materials such as MoS2 and WS2 are joining this activity. We employ both CVD and PVD methods for large-area synthesis of the 2D materials. A novel method termed ALD will soon be added to this family of advanced synthesis techniques. The potential of such 2D materials for energy applications has also been investigated.
3. Novel metallization for WBG devices towards energy-efficiency electronic system
Project leader: Hans Norström
Scientists: Shabnam Mardani, Ulf Smith, Jörgen Olsson, Shi-Li Zhang
External funding: SSF
Wide band gap (WBG) materials and devices have been the subject of several successful Swedish research projects. The work so far has mainly concentrated on those material properties that give WBG devices a far better performance than silicon counterparts under similar operating conditions. Although these devices are eminently suited for harsh conditions, the applications are presently limited by the metallurgical stability of the metallization. We have therefore been investigating if a metallization scheme based on Ag or Cu, combined with barrier and cap layers of Ta and TaN, can be optimized to provide reliable operation at very high temperatures and very high electrical current densities.