The properties of self-assembled In0.5Ga0.5As quantum dots on vicinal GaAs substrates are investigated by atomic force microscopy and temperature-dependent photoluminescence (PL). It is found that both the size variation and the density of the quantum dots depend closely on the orientation of substrates. PL spectra indicate that the In0.5Ga0.5As quantum dots on 4°-off substrate exhibit higher intensity compared to those on 15°-off and exact (100) substrates. The activation energy derived from the temperature-dependent PL of the In0.5Ga0.5As quantum dots on 4°-off substrate is higher than that of the dots on 15°-off substrate. The quantum dots on exact (100) substrate exhibit the lowest activation energy because a thick wetting layer is formed.
|頁（從 - 到）||550-553|
|期刊||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|出版狀態||Published - 1999 一月 1|
|事件||Proceedings of the 1998 International Symposium on Formation, Physics and Device Application of Quantum Dot Structures, QDS-98 - Sapporo, Japan|
持續時間: 1998 五月 31 → 1998 六月 4
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)