NOVELTY - A device comprises a solar cell having a high efficiency backside electrode configuration, including transparent conductor(s) (109), a photovoltaic layer (107), bottom electrode(s) (104), and backside electrode(s) (108); several electrical conduction fingers mounted to the conductor in the cell; several filled vias coupled to the fingers, and extending through the conductor, photovoltaic layer, and bottom electrode, where each via has a conductive core that conducts charge from the conductor to backside electrode; and a via insulating layer (122) separating the core from bottom electrode.    USE - As an optoelectronic device such as solar cell array.    ADVANTAGE - The device has a solar cell having a high efficiency backside electrode configuration. The backside conductor is electrically insulated from the bottom electrode and is connected by the filled vias which are spaced closely enough to each other such that the conductivity requirement of the top electrode is reduced and the need for area obscuring busbars is eliminated. The insulating layer forms a layer covering the sidewall of the via hole and along the entire backside of layer. This simplifies the number of steps as there is no need to have a liner removal step or prior application of an insulating layer. The backside electrode layer may be applied directly to the layer. Since the conductive back planes carry electrical current from one device module to the next the conductive traces can include fingers while avoiding thick busses. This reduces the amount of shadowing due to the busses and also provides a more aesthetically pleasing appearance to the device array. Fabricating the device modules on substrates made of relatively thick, highly conductive, flexible bulk conductor bottom electrodes and backplanes and forming insulated electrical contracts through the transparent conducting layer, the active layer, the bottom electrodes and the insulating layer allows the device modules to be relatively large. Consequently the array can be made of fewer device modules requiring fewer series interconnections compared to prior art arrays.    DETAILED DESCRIPTION - A device comprises a solar cell having a high efficiency backside electrode configuration, containing at least one transparent conductor (109), a photovoltaic layer, at least one bottom electrode (104), and at least one backside electrode (108); several electrical conduction fingers mounted to the transparent conductor in the solar cell; several filled vias coupled to the electrical conduction fingers, and extending through the transparent conductor, the photovoltaic layer, and the bottom electrode, where each via has a conductive core that conducts charge from transparent conductor to backside electrode; and a via insulating layer separating the conductive core in each via from bottom electrode. The insulating layer is formed by aerosol coating of the via. The insulating layer is formed from an adhesive material. An INDEPENDENT CLAIM is included for forming a device involving forming a solar cell comprising at least one transparent conductor, an photovoltaic layer, and at least one bottom electrode; forming several via holes through the transparent conductor, photovoltaic layer, and bottom electrode; and coating the via holes to form an insulating layer along a side wall in each of the holes.    DESCRIPTION OF DRAWING(S) - The figure shows a vertical cross-sectional schematic diagram of a portion of an array of optoelectronic devices.    solar cell array (100)    bottom electrode (104)    photovoltaic layer (107)    backside electrode (108)    transparent conductor (109)    insulating layer. (122)