Abstract
UNSW School of Photovoltaic & Renewable Energy Engineering
Analytic Description of Zinc-Blende Nanocrystals as Function of Size, Shape and Surface Orientation to Interpret Solid State Spectroscopy Data
Dirk Konig - UNSW SPREE & UNSW IMDC
Semiconductor nanocrystals (NCs) transfer charge to and experience stress by embedding materials/ligands or impurity atoms which reflects on their environment, possibly leading to matrix deformation, propagated strain and alternations in their electronic structure. I derived analytical number series as tools to obtain the number of NC atoms, bonds between these NC atoms and NC interface bonds for seven high symmetry zinc-blende (zb) NC types with low-index faceting. With these, I introduce a universal gauge to evaluate stress impact on NCs and their response as function of NC size. These fundamental insights into NC structures allow for major advancements in data interpretation and understanding of zb- and diamond-lattice based nanomaterials.
In this seminar, I will touch on the derivation of number series and then focus on their application in solid state spectroscopy such as Raman, FT-IR, PL, EPR/ESR, TEM, XANES, and UPS. As for solar cells, the algorithms can serve to predict and evaluate the origin and structure of grain boundaries in poly-Si layers and of strain-balanced growth and associated defect generation in embedded III-V NC systems
Analytic Description of Zinc-Blende Nanocrystals as Function of Size, Shape and Surface Orientation to Interpret Solid State Spectroscopy Data
Dirk Konig - UNSW SPREE & UNSW IMDC
Semiconductor nanocrystals (NCs) transfer charge to and experience stress by embedding materials/ligands or impurity atoms which reflects on their environment, possibly leading to matrix deformation, propagated strain and alternations in their electronic structure. I derived analytical number series as tools to obtain the number of NC atoms, bonds between these NC atoms and NC interface bonds for seven high symmetry zinc-blende (zb) NC types with low-index faceting. With these, I introduce a universal gauge to evaluate stress impact on NCs and their response as function of NC size. These fundamental insights into NC structures allow for major advancements in data interpretation and understanding of zb- and diamond-lattice based nanomaterials.
In this seminar, I will touch on the derivation of number series and then focus on their application in solid state spectroscopy such as Raman, FT-IR, PL, EPR/ESR, TEM, XANES, and UPS. As for solar cells, the algorithms can serve to predict and evaluate the origin and structure of grain boundaries in poly-Si layers and of strain-balanced growth and associated defect generation in embedded III-V NC systems
| Original language | English |
|---|---|
| Publisher | UNSW |
| Publication status | Published - 17 Nov 2016 |
| Externally published | Yes |