ABSTRACT
Due to new techniques available to grow semiconductors, the interest in complex heterostructures with geometries different from the planar emerged. With them, new and exciting applications in optoelectronics as well as in biomedicine also arose. ese new heterostructures are constructed with coaxial semiconductor cylinders and concentric semiconductor spherical shells. ey are also known as core-shell structures. Figure 35.1 shows a schematic of heterostructures with planar, cylindrical, and spherical geometries. Advanced optical measurements have shown that the optical and electronic properties of these systems present noticeable di erences with respect to those with at surfaces.
