NOVELTY - Producing an organic-inorganic energy harvesting device, involves introducing an organic layer to a conductive substrate, the organic layer comprises an interpenetrating network having at least one dimension between 0.1 and 100 nm; and introducing one or more semiconducting inorganic materials within the interpenetrating network.    USE - The method is useful for producing organic-inorganic energy harvesting device (claimed).    ADVANTAGE - Hybrid energy harvesting devices can be produced with the method with low production costs, in part because they constitute a thin-film technology with low material requirements and because they use abundant raw materials (e.g. metal-oxides and organic compounds). Deposition methods are compatible with scalable manufacturing processes (e.g. roll-to-roll). Hybrid solar cells prepared by the method take advantage of the highly tunable electronic structure of conjugated organic materials. This allows for the synthesis of the materials with variable optical band gaps that can absorb in different regions of the solar spectrum.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) an energy harvesting device formed by the method;    (2) a hybrid organic-inorganic thin film comprising an organic-phase comprising a porous organic nanostructure comprised of an interpenetrating network having at least one dimension between 0.1 and 100 nm; and an inorganic phase at least partially distributed within the porosity of the organic phase; and    (3) a hybrid organic-inorganic energy harvesting device comprising: a first electrode; an organic layer deposited on the first electrode, the organic layer comprising an interpenetrating network of one or more conjugated polymer fibers having at least one dimension between 0.1 and 100 nm to the substrate; and an inorganic semiconducting material at least partially distributed within the interpenetrating network of fibers; and a second electrode, where the organic layer and the inorganic semiconducting material are sandwiched between the first and the second electrodes.