China's semiconductor / dielectric Polymer Composites achieved a major breakthrough
Recently, Yang calf researcher group CAS Changchun Institute of Applied Chemistry major breakthrough in semiconductor / insulator polymer composites research, its findings are internationally renowned journal "Advanced Functional Materials" to "frontispiece" form to give key reports.
Traditionally, the insulator will hinder charge transport, so in general, in semiconductor / insulator composite insulating phase often plays a role in reducing the electrical properties of the material. However, recent studies have found that, under certain field conditions, the carrier mobility of the two-dimensional surface of the composite material is not bad. Young calf group was first discovered in the bulk semiconductor / dielectric polymer composites and confirm the insulating matrix enhanced semiconductor charge transport phenomena, then this law will be extended to three-dimensional system without specific field conditions and more universal use of physical - conductivity to prove this point.
By controlling the preparation of polythiophene thiophene / insulating polymer blends crystallization and phase separation of the competition, inhibit large-scale two-phase separation, to thereby obtain a homogeneous semiconductor / insulator composites. This material exhibits insulating matrix enhanced semiconductor charge transport phenomena. The researchers believe that the carriers in the form of polaron conduction in the composite material. Due to the low susceptibility insulating matrix, polarons in the transmission of the semiconductor / insulator interface of polarization less affected by the surrounding environment, help to reduce the activation energy of charge transfer at the interface, thereby improving the interface between the two phases carrier mobilities. In this sense, the two-phase blends, reinforced body with charge transport properties need to meet the following three conditions: First, given the charge of the main transmission blends the two phases, the dielectric constant of the insulating polymer must be low enough only It may reduce the activation energy of charge transfer, so as to effectively increase the carrier mobility of the semiconductor phase; secondly, the semiconductor / insulator phase separation of the two phases needs to be small enough scale to a substantial increase in the two-phase contact interface; third, requires semiconductor phase have relatively good continuity, help reduce the resistance of charge transfer.
In the semiconductor polymer by introducing common insulating polymer blends can not only improve their electrical performance, and based on flexible electronic devices can reduce the cost of plastic, increase their flexibility and environmental stability.
Global demand for rapid increase of polymer composites