Profile imaging of reconstructed polar and non-polar surfaces of ZnO

Chemical Stability of ZnO Nanostructures in Simulated Physiological Environments and Its Application in Determining Polar Directions

“…To quantitatively determine the polarity of the surfaces, CBED was supplemented by theoretical simulation. 32 (2) HRTEM, 34 and (3) the electron energy loss spectrum (EELS) technique. 35 Table 2 compares these three methods.…”

“…In addition, this method is very sensitive to the defects in the sample. Identifying the polar direction using HRTEM largely depends on the quality of the HRTEM images and the image simulation, as has been discussed by Ding et al 34 Moreover, the orientation of the nanocrystals severely limits the applicability of this technique. Compared to CBED, the advantage of HRTEM is that it can be used to study samples less than 10 nm thick.…”

Surface Polarity and Shape‐Controlled Synthesis of ZnO Nanostructures on GaN Thin Films Based on Catalyst‐Free Metalorganic Vapor Phase Epitaxy

“…In addition, the angle between the main side faces and bases was 628, which implies that the face is a {1011} plane (Fig 3a). [18] Meanwhile, between these two main planes, an approximately 7 nm wide interfacial plane with a face that makes an angle of 1188 with the base is clearly identified, indicating that the side face is a {101 1} plane (Fig 3a). An enlarged HR-TEM image taken from the black square in Figure 3a shows that the lattice ordering continues to the surfaces with no amorphous layer coated on the surfaces (Fig.…”

“…Without considering surface reconstruction, the atomic configuration of the corrugated ZnO nanorods projected along the [21 10] direction is described in Figure 3c, which reveals that the entire crystals are composed of either O-terminated or Zn-terminated polar surfaces. [18] Figure 4 schematically illustrates the growth mechanism of two kinds of smoothsurfaced and stacked-pyramid structured ZnO nanorods on the micro-faceted GaN films. It is well known that the existence of adatoms has a major influence on the surface morphology.…”

Drift mobility of photocarriers on Zn‐ and O‐polar surfaces of ZnO

“…This is because stacking sequences of atomic layers along the c-axis are asymmetric. Surface polarity effects on physical properties have been reported in the studies by photoluminescence [1], spectroscopic ellipsometry [2], scanning tunneling microscopy [3], X-ray diffraction and atomic force microscopy [4,5], transmission electron microscopy [6,7] and the Schottky diode characteristics [8]. As well, polarity controlled ZnO films have been successfully prepared by molecular-beam epitaxy [9][10][11].…”