Polyelectrolytes-organometallic multilayers for efficient photocurrent generation: [polypropylviologen/RuL2(NCS)2/(PEDOT;PSS)]n on ITO

The polyelectrolytes-organometallic system is prepared and applied to the photocurrent generation. The viologen-containing polymers (polyproylviologen) have two Br− counter ions and are easily soluble in water. The viologen-containing polyelectrolyte multilayers were formed by layer-by-layer deposition method. And as a photosensitizer, RuL2 (CNS)2 are easily incorporated in the multilayer films by a ion-exchange method. The energy levels of LUMO of RuL2(CNS)2, viologen, and ITO are well arranged and form an acceptor–sensitizer system. The photocurrent measurement of the systems shows excellent photocurrent generation: 1200 nA/cm2 under A.M 1.5 condition for 4.5 bilayers sample.