Molecular chemical doping for improvement of performance in organic field effect transistors

Abstract

The development of organic semiconducting materials paved a path for developing a range of organic devices such as organic field effect transistors (OFETs), organic light – emitting diodes (OLEDs), organic photovoltaics (OPVs)1 and so on. There are a lot of advantages of these organic semiconducting materials and devices made based on them over their inorganic counterparts such as unique physical and mechanical properties which in its turn opens opportunities for flexible, light – weight, printable and even paperbased devices.2–5 Organic materials are also very easily processed. They offer fabrication methods ranging from conventional thermal evaporation to solution – processing that enables simple fabrication steps such as spin – coating,6 drop – casting,7 inkjet – printing8 and etc. at temperatures as low as room temperature. Also, organic materials are plenty and hundreds of them are synthesized every year. They offer a great range of options for synthesizers. But the main advantage of these organic materials and devices is that they themselves and the processes they go through are not as expensive and complicated as those of their inorganic counterparts. But organic semiconductors suffer from very serious problems such as very poor electrical properties and stability. Although organic semiconductors offer a great range of application fields, these two issues make them fall behind the inorganic semiconductors.