Is Correlation Important in Explaining the Charge Transport in Disordered Molecular Solids ?

TL;DR

This paper investigates charge transport in disordered molecular solids, emphasizing the significance of spatial and energetic correlations in explaining mobility behavior under electric fields and temperature variations.

Contribution

It provides an extensive analysis comparing theoretical models, demonstrating the importance of correlations in charge transport within disordered molecular solids.

Findings

Correlation is crucial for explaining electrical transport.

Theoretical models incorporating correlation better fit experimental data.

Electric field dependence of mobility is explained by correlated models.

Abstract

We have examined the electrical transport in disordered molecular solids. It has been found that mobility is a function of electric field and temperature due to hopping conduction. Several theoretical models for charge transport in disordered solids have been debated over the role of spatial and energetic correlation in these systems and such correlations have been recently shown to explain the universal electric field dependence of mobility. We have compared and evaluated the applicability of different theoretically proposed models using very simple experimental results and based on our extensive analysis, we have found that correlation is important to explain the electrical transport in these systems.