Used primarily in the synthesis of conductive polymers, especially poly(3,4-ethylenedioxythiophene) (PEDOT). This polymer is widely applied in organic electronics due to its high electrical conductivity and optical transparency. Common applications include anti-static coatings, transparent electrodes in touchscreens and displays, organic light-emitting diodes (OLEDs), and solar cells. It is also used in biosensors and neural interfaces because of its biocompatibility and efficient charge transport. Additionally, PEDOT-based materials serve in supercapacitors and electrochromic devices owing to their stability and reversible redox behavior.