Abstract: A Process for producing an inverted polymer photovoltaic cell (or solar cell) includes the following steps providing an electron contact layer (cathode); depositing a cathodic buffer layer onto said electron contact layer; depositing a photoactive layer comprising at least one photoactive organic polymer and at least one organic electron acceptor compound onto the cathodic buffer layer; depositing an anodic buffer layer onto the photoactive layer; and providing a hole contact layer (anode). The step of depositing the cathodic buffer layer includes the steps of forming a layer onto the electron contact layer of a composition comprising having at least one zinc oxide and/or titanium dioxide or a precursor thereof, at least one organic solvent and at least one polymer soluble in the organic solvent; and plasma treating the layer formed onto the electron contact layer so as to form the cathodic buffer layer.

Abstract: Inverted polymer solar cell comprising: an electron contact layer; a cathodic buffer layer; an active layer comprising at least one ?-conjugated polymer and at least one organic electron acceptor compound; an anodic buffer layer; a hole contact layer; wherein the cathodic buffer layer comprises zinc oxide and/or titanium dioxide and at least one interfacial agent selected from optionally substituted C7-C21 aromatic carboxylic acids or salts thereof. Such polymer solar cells have improved performance in terms of high charge mobility, high transparency, high efficiency and high chemical stability, which can be produced on a large industrial scale with a high surface area. A process for producing the same is also provided.

Abstract: Inverted polymer solar cell comprising: an electron contact layer; a cathodic buffer layer; an active layer comprising at least one ?-conjugated polymer and at least one organic electron acceptor compound; an anodic buffer layer; a hole contact layer; wherein the cathodic buffer layer comprises zinc oxide and/or titanium dioxide and at least one interfacial agent selected from optionally substituted C7-C21 aromatic carboxylic acids or salts thereof. Such polymer solar cells have improved performance in terms of high charge mobility, high transparency, high efficiency and high chemical stability, which can be produced on a large industrial scale with a high surface area. A process for producing the same is also provided.