Abstract
Electron transport in both ZnO(0001)–Zn and ZnO(000–1)–O bulk single crystals was studied using the elastic-peak electron spectroscopy (EPES) measurements. The inelastic mean free path (IMFP) was evaluated from EPES using both Ni and Au standards in the energy range 200–2000eV, and compared with IMFPs calculated from the predictive TPP-2M formula for the measured composition of both single crystal surfaces. In the electron energy range from 1 to 2keV, the IMFPs were found to be 34% larger for the ZnO(0001)–Zn crystal surface than for the ZnO(000–1)–O crystal surface, and considerably larger than the IMFPs obtained from the TPP-2M predictive formula. At energies lower than 1keV, a good agreement between the corresponding IMFPs values was found. However, the electron transport at larger energies seems to be affected by different bulk structure of both crystals.
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