NOVELTY - An optoelectronic device (10) comprises: a first substrate (12) comprising at least one active region; a first electrode (14) disposed on first substrate; a first interdigitating, nanostructured charge-transfer molded material (16) comprising a first electron affinity disposed on first electrode; a second interdigitating, nanostructured charge-transfer material (20) comprising a second electron affinity disposed on first charge-transfer material; a second electrode (22) disposed in second charge-transfer material; and a second substrate (24) disposed on second electrode.    USE - As an optoelectronic device, preferably a solar cell (claimed) or photovoltaic cell useful for power generation or as a source of electrical energy.    ADVANTAGE - The photovoltaic devices contain nanostructured charge-transfer polymer materials that provide improved charge mobility, allow low-cost and highly efficient power generation, and provide devices with high economical potential.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) preparing (M1) the optoelectronic device involving: nanoimprinting or molding a first interdigitating, nano-structured charge-transfer material with a template mold on a substrate, where the substrate comprises at least one active region, the material comprising a base and nanoposts (18a-18d), nanopores, or nanogratings; depositing a second charge-transfer material layer on the first nanostructured charge-transfer materials to form a electron-acceptor:hole-acceptor polymer pair; and connecting each of the first and second nanostructured charge-transfer material to an electrode, where at least one of the electrodes in translucent;    (2) preparing (M2) a highly-ordered, nanopore template involving: anodizing a polished anodizable template; dissolving the anodized template to form a pock-marked template; and re-anodizing the pock-marked template, where the re-anodized template comprises several cells that comprise an anodized barrier layer and a pore;    (3) orienting (M3) a polymer chain in a polymer by nanoimprinting involving: selecting the polymer for nanoimprinting; spreading the polymer as a layer for nanoimprinting; adjusting a temperature of the polymer layer above the glass transition temperature of the selected polymer; adjusting a viscosity of the polymer layer; contacting the polymer layer with a porous template mold, where the template mold comprises at least one nanostructure; flowing the polymer into the porous mold; releasing the porous mold from the polymer layer; and monitoring the orientation of the polymer chains by at least one analytical technique; and    (4) filling (M4) a patterned functional layer disposed on a surface with a charge transfer material involving: oxidizing a transfer surface; spin-coating the charge transfer material on the oxidized transfer surface; adjusting a temperature of the charge transfer material coated oxidized transfer surface; where temperature of the coated charge transfer material is below the glass transition temperature of the patterned polymer layer disposed on the surface; contacting the coated and oxidized transfer surface with the patterned polymer layer disposed on the surface; applying heat and pressure to a stack, where the stack comprises the patterned polymer layer disposed on the surface and the charge transfer material coated oxidized transfer surface; adjusting the temperature of the stack, where the temperature is lower than glass transition temperature of the patterned polymer layer disposed on the surface; flowing the charge transfer material from the polymer coated oxidized transfer surface into the patterned polymer layer disposed on the surface; and releasing the oxidized transfer surface from the stack.    DESCRIPTION OF DRAWING(S) - The figure shows cross-sectional view of the photovoltaic device.    First substrate (12)    First electrode (14)    First layer of nanostructured polymer (16)    Cylindrical posts (18a-18d)    Second layer of nanostructured active polymer (20)    Second electrode (22)    Second substrate (24)