G2) Colloidal Semiconductor Nanocrystals for Optoelectronics and Photonics

Colloidal semiconductor nanomaterials—such as CdSe quantum dots and colloidal nanoplatelets—offer precise control over size, shape, and composition through solution-phase synthesis, making them highly promising for next-generation optoelectronic devices. Fundamental problems with size, shape, structure (core/shell, core/crown/shell), and surface chemistry define the properties which are tailored for specific applications. Strong quantum confinement in these nanomaterials facilitates efficient spontaneous emission for light-emitting diodes (LEDs), while type-II heterostructures enable optical gain and lasing at reduced thresholds. Furthermore, careful band alignment with neighboring layers can enhance performance in photovoltaic cells and photodetectors. This symposium will highlight recent advances in the synthesis, surface functionalization, assembly, and integration of colloidal nanomaterials, along with their implementation in optoelectronic and photonic systems. The program will span from fundamental studies to emerging device applications.

Topics will include:

1. Synthesis, Surface Chemistry and Assembly

• • Advanced synthesis of colloidal quantum dots, nanoplatelets and perovskites.
  • Heterostructure engineering of colloidal nanocrystals (core/shell, core/crown, type-I and type-II heterostructures)
  • Surface chemistry and ligand exchange strategies
  • Self-assembly and large-area integration techniques (e.g., film formation, patterning, and coatings)

2. Optical Properties and Spectroscopy

• • Spectroscopy and imaging techniques for probing nanocrystal properties
  • Carrier dynamics, exciton behavior, and energy transfer mechanisms
  • Charge separation and recombination in nanocrystal-based heterostructures
  • Transport studies in assembled nanocrystal systems
  • Multiexciton generation and stimulated emission
  • Polarization control, circular dichroism, and nonlinear optical effects

3. Light-Emitting Devices and Lasing Applications

• • Colloidal nanocrystal and their performance in LEDs
  • Colloidal nanocrystal for low-threshold optical gain and lasing
  • Integration with microcavities and photonic structures
  • Patterned nanocrystals for displays and photonic circuitry
  • Emerging use in quantum nanocrystals and single-photon emission platforms

4. Photodetectors, Solar Cells, and Energy Harvesting

• • Colloidal nanocrystal in photovoltaic devices
  • Photodetectors based on quantum dots, nanoplatelets and perovskites
  • Emerging applications in optical sensing and integrated photonics