• Opto1small
  • Opto Small7
  • Optoelectronics 1 14845
  • Optoelectronics 2 14846

The group has its research focus on optical and electrical properties of colloidal semiconductor nanocrystals, on metal nanostructures, graphene, and on hybrid systems that benefit from advantageous properties of those materials. Colloidal semiconductor nanocrystals can be excellent light emitters or absorbers, and the optical properties like for example the light emission wavelength, direction and polarization can be controlled via the nanocrystal size, shape and composition.

This makes them very interesting as active material in light emitting, lasing, or photovoltaic devices, and we are exploring novel approaches for proof of principle prototypes. On the other hand, metal nanostructures are very good conductors and can strongly interact with light in the visible and infrared spectral regions due to the presence of free electrons that can perform plasmon oscillations, which opened the field of nanoplasmonics.

Recently, graphene has attracted great interest as a 2D material with very appealing conductive, plasmonic, and mechanical properties. We aim at combining the favorable properties of these materials in order to investigate complex optoelectronic systems and to pave the way for novel architectures for components in photodetectors, optical communication, photovoltaics, plasmonics, and nanoscale electronics.


Congratulations to Giulia Biffi who won the ACS Photonics prize for the best oral presentation at the Nanophotonics and Micro/Nano Optics International Conference (NANOP) 2019 in Munich.

Recent activities

Journal Covers

  • Optoelectronics nanoscale
  • Optoelectronics particle
  • Journal1
  • JMatChemC Inside Cover


We have micromanipulator probe stations in ambient (Karl Suss) and cryogenic (Janis Research) environment that can be coupled to various light sources and lasers spanning the spectral range from UV/VIS to NIR for photoelectrical characterization. Piezo-controlled mibots (Imina) reaching nanometer control can be used for probe contacts with optical and electron microscopes. The electrical  instruments such as Keithley 2612 sourcemeters, lockin amplifiers, temperature controllers etc are controlled via a Labview platform. Our group has access to the nanochemistry and optical spectroscopy labs as well as to the clean room.

Current Projects

  • Coordinator of the H2020-MSCA-RISE project COMPASS 691185 (2016-2020)
  • EU ATTRACT project “Tailored metamaterials for Extremely High-Resolution Imaging and Sensing” (TEHRIS) (2019-2020)
  • Italy-Israel bilateral project “Artificial Intelligence and Data Management for Colloidal Quantum Dot Materials Research” (AI-4-QD)


  • Prof. Pingheng Tan, Chinese Academy of Sciences, Institute of Semiconductors
  • Prof. Davide Comoretto, University of Genoa
  • Dr. Alexander Weber-Bargioni, Lawrence Berkeley National Lab, California, USA
  • Prof. P. James Schuck, Columbia University, New York, USA
  • Dr. Cinzia Giannini, IC-CNR, Bari, Italy
  • Prof. Iwan Moreels, University of Ghent, Belgium


Roman Krahne was appointed Guest Professor at the Institute of Semiconductors, Chinese Academy of Sciences