Research topics
The group focuses in the research of nanomaterials, nanostructures and advanced materials for use especially in nanoelectronics and nanophotonics. Areas of current research activities include
- graphene and related 2D materials including CVD fabrication and devices). The group participates in the EU Graphene Flagship project, see http://graphene-flagship.eu/
- compound semiconductor nanowires, see e.g. http://www.iet.ntnu.no/projects/nanordsun/
- energy efficiency especially in advanced LED and solar cell concepts. The group is involved in the Aalto Energy Efficiency program, see http://energyefficiency.aalto.fi/en/research/moppi/
- nanofabrication by atomic layer deposition (ALD), metalorganic chemical vapour deposition (MOCVD), electron beam lithography, focused ion beam lithography, self-assembly etc.
- micro-, nano- and optoelectronic devices based on semiconductors (GaN, GaAs, InP, Si...) and their nanostructures (such as quantum dots, nanowires and black silicon). Examples of devices are x-ray detectors, SERS sensors, THz emitters & detectors.
- materials characterisation (optical spectroscopy, Raman mapping, AFM, SEM. XRD, XRR, electrical measurements)
Recent doctoral dissertations:
- Aapo Lankinen: Synchrotron X-Ray Diffraction Topography of Semiconductor Heterostructures (2012). Presently in Okmetic (Finland).
- Mikko Juntunen: Development of tileable silicon photodiodes for X-ray imaging (2013). Presently in Naps Solar Systems & Aalto (Finland).
- Joan Montiel: Analysis of photodarkening effects in ytterbium-doped laser fibers (2013). Presently in Monocrom (Spain).
- Lasse Karvonen: Nanostructures for photonic applications (2013). Presently in Microsoft (Finland).
- Sakari Sintonen: Synchrotron radiation x-ray topography of crystallographic defects in GaN (2014). Presently in Leibniz-Institut für Kristallzüchtung (Germany).
- Amit Khanna: CMOS Integrated Optics - Studies on Submicron Waveguide Mode Properties and Devices (2015). Presently in Imec (Belgium).
- Alexander Pyymäki Perros: Thermal and plasma-enhanced atomic layer deposition: the study of and employment in various nanotechnology applications (2015). Presently in start-up company Nanovate (Finland).
- WonJae Kim: Fabrication and characterization of graphene-based electronic devices (2015). Presently in VTT (Finland)
- Tuomas Haggrén: Nanowire technology for optoelectronic applications (2016).
- Ali Shah: Black silicon technology and applications (2016). Presently in VTT (Finland).
- Pasi Kostamo: Material characterization and fabrication of compound semiconductor X-ray detectors (2017).