Arrangment of PbSe NCs

Three-dimensional arrangement of PbSe nanocrystals (NCs) in a laser annealed PbSe/a-Si nanocomposite film imaged by electron tomography. 
(a, b) Cross-sectional annular dark field scanning transmission electron microscopy images of a PbSe/a -Si nanocomposite film annealed by a 50 mJ/cm2 laser pulse. (c) Tomographic reconstruction of the laser annealed nanocomposite film illustrating the three-dimensional (3D) arrangement of the NCs in the film. The 3D structure is shown by direct volume rendering of the reconstruction. The first NC layer is highlighted using a red-yellow-white color scale.