Dielectric Thermodynamics of Organic Semiconductors

We here consider the thermodynamic macroscopic behavior of organic molecular semiconductors (OMS) from the point of view of their dielectric response and phase trantitions. We focus on a couple of largely investigated crystals, namely -quaterthiophene (4T) and tetracene (TEN). In such systems the evaluation of dielectric thermodynamics as a function of temperature is able not only to highlight the specific structure and patterns of phase transitions in markedly polymorphic compounds, but also to provide a practical estimation of the stability of each identified phase. The analysis carried out on such OMS can be considered a useful paradigm to apply the same procedure, interpretations, and concepts on the large and growing domain of organic materials for electronics.