Crossover from band-like to thermally activated charge transport in organic transistors due to strain-induced traps.

ABSTRACT: The temperature dependence of the charge-carrier mobility provides essential insight into the charge transport mechanisms in organic semiconductors. Such knowledge imparts critical understanding of the electrical properties of these materials, leading to better design of high-performance materials for consumer applications. Here, we present experimental results that suggest that the inhomogeneous strain induced in organic semiconductor layers by the mismatch between the coefficients of thermal expansion (CTE) of the consecutive device layers of field-effect transistors generates trapping states that localize charge carriers. We observe a universal scaling between the activation energy of the transistors and the interfacial thermal expansion mismatch, in which band-like transport is observe

SUBMITTER: Mei Y 

PROVIDER: S-EPMC5565442 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature