Furthermore, the electron loss function (ELF) describes the amount of energy loss and collective excitation of electrons in a material when exposed to light. Noticeably, first, two sharper ELF peaks appear at 1.92 eV and 3.11 eV of the VR region. Multiple more intense peaks also appear in higher energy of UV indicating the more energy drop. Photon energy (eV) However, the magnitude of ELF is still very small as compared to PG , indicating low energy loss, suitable for energy harvesters. After introducing the strain, the amplitude of ELF peaks slightly increases (decreases) with tensile (compressive) strain. The threshold energy value of ELF shifts to a lower (higher) range with tensile (compressive) strain indicating the red shift and blue shift phenomena, respectively. These peaks have resulted from the oscillation of electric dipoles and the environment of ionization .