Progress on Polymer-matrix Molecular Semiconductor Dielectric Composites
Thin film capacitors are widely used in smart grid,wind power generation,electric vehicle,pulse power system and other fields because of their high power density,low loss,long cycle life,safety and environmental protection.The dielectric is the key to the performance of film capacitors,but the energy storage property of film capacitors is greatly reduced by the leakage current caused by the defects and impurities in the materials at high temperature and high electric field,which make it difficult to obtain high energy density in thermally and electrically coupled fields.The introduction of trace organic molecule semiconductor into polymer dielectric can produce energy traps to trap carriers and suppress leakage current,thus reducing conductivity loss and improving charge-discharge efficiency.In this review,the methods for improving the high temperature energy storage properties of dielectrics by introducing organic molecular semiconductors into polymer matrix are summarized,the influence mechanism of organic small molecule semiconductor and polymer molecular semiconductor modification on energy storage properties is discussed,and the future development of related fields is prospected.
Organic small molecular semiconductorPolymer molecular semiconductorsComposite dielectricLeakage currentHigh temperature energy storage
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