NOVELTY - A conjugated polymer coating forming material is introduced into atmospheric pressure plasma discharge or into its reactive gas stream. Simultaneously, an additional material is introduced into the plasma discharge or its reactive gas stream, and a substrate is exposed to plasma discharge or its reactive gas stream to form conjugated polymer coating.    USE - For forming conjugated polymer coating on substrate, used in polymeric light emitting diodes, organic solar cells, polymeric transistors and organic (bio) sensors. Also used as antistatic coating and for corrosion prevention of metals.    ADVANTAGE - The conjugated polymer coating having improved adhesion with respect to the substrate, and excellent mechanical properties is formed. The introduction of the additional material improves the conductivity of the coating.    DETAILED DESCRIPTION - The additional material is inorganic or organic/inorganic precursor or doping or dedoping agent chosen from chlorine, bromine, iodine, iodochloride (ICl, ICl3), iodobromide, iodofluoride, phosphorus pentafluoride, arsenic pentafluoride, antimony pentafluoride, boron trifluoride, boron trichloride, boron tribromide, sulfur trioxide, hydrogen fluoride, hydrogen chloride, nitric acid, sulfuric acid, hydrogen perchlorate, fluoro sulfonic acid, chloro sulfonic acid, trifluoromethyl sulfonic acid, acetic acid, formic acid, amino acid, ferric chloride, ferrous oxy chloride, titanium tetrachloride, zirconium tetrachloride, hafnium tetrachloride, niobium pentafluoride, niobium pentachloride, tantalum pentachloride, molybdenum pentachloride, tungsten pentachloride, tungsten pentafluoride, uranium hexafluoride, lanthanum chloride, chloride, bromide, iodide, perchlorate, hexafluoro phosphate, pentafluoro arsenate, antimony hexafluoride, boron tetrafluoride, sulfonate anions, lithium, sodium, potassium, rubidium, cesium, calcium, strontium, barium, yttrium, lanthanum, cerium, praseodymium, samarium, neodymium, europium, gadolinium, terbium, dysprosium, holmium, erbium, ytterbium, ammonium ion, cations such as R4P+, R4As+, R3S+ and acetyl choline. The additional material is organo silicon precursor. The coating forming material contains organic monomer precursors.    DESCRIPTION OF DRAWING(S) - The figure shows the method of forming conjugated polymer coating.    Apparatus (4)    Gas (5)    Gas supply unit (6)    Pump (7)    Control valve (8)