Instructor: Prof. Giacomo Giorgi
Course Schedule (3 CFU):
May 7, 18, 21 2021
9:00 - 12:00, 14:00 - 17:00
(didactic material)
The class will focus on the materials/working principles that rule processes of interest in Optoelectronics. It will consist in 3 CFU (1CFU=6hrs) with frontal lessons and final self-assessment.
First module: (1) Semiconductors and their properties. Concepts of bandstructure and bandgap. Large gap and zero-gap semiconductors. Photovoltaics and Photocatalysis working principles. Photoconversion Efficiency (PCE). Silicon cells; Second generation (thin film) CIGS devices; Multi-junction (third generation) solar cells. Cheap PV: Graetzel cells (Dye Sensitized Solar Cells, DSSC). Carrier Transport Materials (HTM/ETM).
Second module: (2) Hybrid Perovskites in optoelectronics: from PV to photonics. Device architectures and their chemical engineering. Pb-less and Pb-free devices. 3D bulk vs 2D/3D and pure 2D Ruddlesden-Popper and Dion-Jacobsen layered materials. From 3D to 0D: same materials, different dimensionalities, different applications.
Third module: (3) Thinning the semiconductor: from bulk to layers. Quantum-confinement and its role in devices. Excitons & Quasi-Particles. Wannier and Frenkel Excitons. Prediction of optical properties by means of first-principles theoretical calculations. Computational Tools and Visualization of Calculated Properties. Nanosheets and photocatalysis: Layers and interfaces. Band Alignments.