Size dependent electron–phonon coupling in N, Li, In, Ga, F and Ag doped ZnO thin films

Polarized micro-Raman measurements are performed to study the phonon modes of N, Li, In, Ga, F and Ag doped ZnO thin films, grown by spray pyrolysis on corning glass substrates. The E2high mode displays a visible asymmetric line shape. The size and dopant dependence onto coupling strength between electron and LO phonon is experimentally estimated.

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► Raman spectra of N, Li, In, Ga, F and Ag doped ZnO thin films.
► Second-order Raman features are discussed in the light of DFT calculations.
► A visible line-shape asymmetry is observed for the E2high mode.
► Size dependent electron and phonon coupling strength.