an organic electron transport layer has at least one dopant for increasing the n - conductivity of the organic layer . the dopant is selected from the group of salts of cyclopentadiene compounds according to formula 1 , wherein the substituents r1 to r2 are independently selected from the group containing — h , - d , halogen , — cn , — no2 , — oh , amine , ether , thioether , alkyl , cycloalkyl , acrylic , vinyl , allyl , aromatics , fused aromatics and heteroaromatics .