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Optoelectronics

Optoelectronics

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.

News

News

Our recent work that reports on exploring the variety of organic amine molecules in the fabrication of two-dimensional layered perovskites is featured on Nature Italy

In this paper that is published in Advanced Materials, we show how the emission color of these materials can be tuned from blue to cold and warm white color with different amines in the synthesis, which is highly promising for application in lighting.

Recent activities

Recent activities

Laboratories

Laboratories

We have labs for optical and electrical sample characterization, as well as access to the IIT clean room, Materials Characterization, Nanochemistry, and Electron Microscopy facilities. In our ultrafast spectroscopy lab we have femtosecond pulsed laser sources (Coherent Legend Elite), time-resolved photoluminescence (PL) spectroscopy (Edinburgh FLS920) and custom made setups for measuring amplified spontaneous emission and micro-PL. For photoconductive characterization we use 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.

Current Project

Current Project
  • 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)

Collaborations

Collaborations
  • 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
  • Prof. Antonio De Luca, University of Calabria, Italy.
  • Prof. Sandrine Ithurria, École Supérieure de Physique et de Chimie Industrielles, Paris France.
  • Prof. Antonio De Luca, University of Calabria, Italy.
  • Prof. Sandrine Ithurria, École Supérieure de Physique et de Chimie Industrielles, Paris France.

Honors

Honors

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

IIT People

Principal Investigator
Roman Krahne

Optoelectronics

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