A new (MOM) approach of the (OLPT) model application to the (AC) conductivity in ZnS chalcogenide material

In this work, we have proposed a theoretical investigation of the complicated Overlapping Large Polaron Tunneling (OLPT) conduction mechanism. In fact, in previous works, some approximations have been made in the aim of adopting the (OLPT) model to the experimental data. These approximations are not convincing and lead to reviewing the (OLPT) model. Thus, in order to avoid these disagreements between experimental and theoretical results, we have proposed a new “methodology” which has allowed us to explore in depth this mechanism of conduction not well investigated. Due to the existence of two variables: temperature and frequency, a fundamental step is to adopt a new approach to fit theoretical parameters to experimental data: the Advanced Second order Fitting (ASF). This approach allowed us to discover the existence of relevant term appearing in the expression of the trapping potential. The corresponding physical interpretation reveals an original and unexpected behavior. The modified (OLPT) model (MOM) proves in a categorical way the validity of certain approximations used without being adequately justified by the (OLPT) model. (MOM) highlights two competitive and spectacular phenomena: the thermal effect and the resonance phenomena. In this work, we have considered the example of ZnS: a chalcogenide presenting the (OLPT) conduction mechanism. •A new methodology has been proposed to explore the (OLPT) conduction mechanism.•New approach has been used in the numerical fitting process for two variables: (ASF).•The Modified (OLPT) Model: (MOM) highlights competitive and spectacular phenomena.•(MOM) proves approximations used to avoid disagreements:(OLPT) model/experiments.