and the like in the case of reduced n type conductive polymers the cation of the salt must be capable of insertion into the polymer during reduction without decomposition suitable cationic species include li na k rb cs alkylammoniums such as ch 3 4 n c 2 h 5 4 n c 3 h 7 4 n c 4 h 9 4 n ch 3 c 3 h 7 3 n as well as sulfonium and phosphonium analogs and the like and cyclic ions such as pyridinium imidazolium and the like particularly preferred are the alkali metal ions for devices which contain only p type or only n type polymers the ion that remains in solution and which is not inserted must be inert to oxidation and rduction respectively preferred anions for use in the presence of reduced polymers are pf 6 alkylborates and arylborates u s pat no 4 522 901 and halides preferred cations for use in the presence of oxidized conductive polymers are the alkali metal ions protons and silver ions room temperature molten salts may also be useful as electrolytes in the present invention such salts include alkylimidazolium tetrachloroaluminates the use of which for the oxidation and reduction of conductive polymers is described in u s pat nos 4 463 071 and 4 463 072 alkylpyridinium tetrachloroaluminates and mixtures of the above with alkali metal halides a variety of transparent conductors such as sno 2 ino 3 and cd 2 sno 4 and the like can be used for the conductive surface on walls 7 and 11 see fig2 and.