Finite Element Analysis Of Conical, Dome And Truncated Inas Quantum Dots With Consideration Of Surface Effects

摘要

Surface effects on conical, dome and truncated InAs quantum dots (QDs) grown on GaAs (001) substrate are quantitatively analyzed with the finite element method (FEM) taking into account the surface energy. It is found that surface effects hinder island formation and arouse changes in strain fields of QDs. According to the minimum potential energy theory, the shape transition from conical island to dome island at a certain critical point is interpreted. We conclude that conical QD or truncated QD are transitional shapes at early stages while dome QD is the mature shape in this case.