... second) is used, and there are 25 6 or 5 12 samples in each scanning Here, one sample represents one line of scanning, which then consists of 25 6 or 5 12 sampling points 2. 3.4 Scanning electron microscopy ... excition transition and bound exciton transition Eb is the free exciton binding energy and Ebx is the bound exciton binding energy In addition to the radiative transitions, there are also non-radiative ... certain defect level, the binding energy is determined by the bandgap, free exciton binding energy, and the bound exciton binding energy, as illustrated in Fig 2. 6 Figure 2. 6 Illustration for...