Local vibrational modes (LVMs) and asymmetric phonon lineshapes are investigated in ZnO : Sb system. Two LVMs at 186 and 235 cm−1 originating due to the change in reduced mass and reduction of localized interatomic force constant have been identified. Upon Sb-doping, the E1(LO) mode of ZnO was found to shift towards the lower frequency side and broaden asymmetrically. These results are analysed within the framework of the Fano interaction in p-type ZnO. Temperature dependence of the E1(LO) mode frequency and line width shows the conventional anharmonic behaviour in ZnO; whereas, it deviates in ZnO : Sb system. In addition, the carrier–phonon coupling strength was found to reduce at higher temperature.
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Samanta et al. (2012) studied this question.
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