Size control and midinfrared emission of epitaxial PbTe/CdTe quantum dot precipitates grown by molecular beam epitaxy

作者：Groiss H^*; Kaufmann E; Springholz G; Schwarzl T; Hesser G; Schaeffler F; Heiss W; Koike K; Itakura T; Hotei T; Yano M; Wojtowicz T

来源：Applied Physics Letters, 2007, 91(22): 222106.

DOI：10.1063/1.2817951

Epitaxial quantum dots with symmetric and highly facetted shapes are fabricated by thermal annealing of two-dimensional (2D) PbTe epilayers embedded in a CdTe matrix. By varying the thickness of the initial 2D layers, the dot size can be effectively controlled between 5 and 25 nm, and areal densities as high as 3x10(11) cm(-2) can be achieved. The size control allows the tuning of the quantum dot luminescence over a wide spectral range between 2.2 and 3.7 mu m. As a result, ultrabroadband emission from a multilayered quantum dot stack is demonstrated, which is a precondition for the development of superluminescent diodes operating in the near infrared and midinfrared.

• 出版日期2007-11-26