Effective Mass Calculations of Energy Bands for Silicon Quantum Dot Solar Cells in Oxide, Nitride and Carbide Matrices

摘要

In this work, we use the effective mass approach to calculate the conduction band (CB) structure of a three dimensional silicon quantum dot (QD) superlattice with the dots embedded in a matrix of SiO_2, Si_3N_4 and SiC. These results clarify the required design features for the proposed all-silicon tandem solar cells using Si QD superlattice. The silicon anisotropic effective mass is shown to reduce both the degeneracies of the isotropic solutions and the energy separation between states. The influence of dot size and inter-dot distance on mobilities is included in this study.