Effects of passage of 200 MeV Ag⁹⁺ions in indium phosphide at different depths

Evidence of defect‐annealing effect in swift heavy‐ion‐irradiated indium phosphide

“…The conservation of momentum usually prevents non‐Γ scattering phonons from being observed in the Raman spectra. An estimation of the phonon coherence length has been done [ 19 ] by applying the PCM. [ 36 ] The damage produced due to defects can cause phonon confinement leading to a reduced phonon coherence length as the momentum k = 0 selection rule is relaxed.…”

“…In addition, the SHI irradiations result in the shift of the phonon peaks in InP Raman spectra, and the strain induced in the crystal is calculated according to the phonon confinement model (PCM), which indirectly suggests that the amorphous occurred in the irradiated InP. [18,19] The transmission electron microscope (TEM) measurement is directly to obtain the damages such as tracks and disorders, whereas Raman spectroscopy as a complementary technique could detect short-range (atomic scale) disorders and small concentrations of defects. [20,21] Although the previous works focus on the formation of latent tracks by TEM or the modification of Raman phonon modes induced by irradiation, these two methods have not been combined well to understand the radiation effect in InP.…”

A potential lattice damage scale in swift heavy ion irradiated InP

“…[ 17,18 ] According to phonon confinement model, the phonon coherence length estimated was found to decrease with increasing depth of the InP samples irradiated with 200‐MeV Ag‐ions, indicating that the average crystallite size was also decreased with increasing depth, and the stress calculated from the Raman shift showed different amount of the stresses at different depth values. [ 19 ] In our previous work, the Raman results show that the stress induced in InP increased with increasing ion fluence after Bi ions irradiation. [ 20 ] The phonon wavenumbers associated with lattice stresses change as a result of irradiation, and then the translational symmetry is broken and the new vibrational modes are created.…”