TECHNOLOGY FOCUS - ELECTRONICS - Preferred Device: In the electrical device above, the electrically active structure is a current generating structure in electrical contact with the second electrode and the electrode comprising the at least one dendritic metal structure. The dendritic metal structure is formed from silver or copper. At least one dendritic metal structure is no more than about 200 nm in average thickness. At least one dendritic metal structure has an average individual segment width of no more than about 1 mu m. The electrically active structure generates current in response to absorption of light. The electrically active structure is a p-n junction. It changes its optical properties in response to an applied field. A solid electrolyte is disposed on the electrically active structure. The dendritic metal structure is disposed on the solid electrolyte. The region of the solid electrolyte disposed directly beneath the dendritic metal structure has an increased concentration of metal. The dendritic metal structure is disposed at the interface between the electrically active structure and the solid electrolyte. The solid electrolyte is a germanium chalcogenide glass. An insulating layer is disposed between the solid electrolyte and the electrically active structure. The dendritic metal structure is disposed between the electrically active structure and a solid electrolyte disposed on an insulating substrate. A solid electrolyte is disposed on the insulator. The dendritic metal structure is disposed between a solid electrolyte and the insulator. The insulator is substantially transparent to visible light. Preferred Method: Making electrical structure further comprises disposing the electrically active structure on the second electrode; disposing a solid electrolyte on a transparent substrate; disposing an anode comprising a metal, and a cathode in electrical contact with the solid electrolyte; applying a bias voltage across the cathode and the anode sufficient to grow the dendritic metal structure extending from the cathode, the dendritic metal structure being formed from the metal of the anode; and electrically contacting the dendritic metal structure with the electrically active structure. The anode is made from the metal dissolved in the solid electrolyte, and the metal of the anode dissolves into the solid electrolyte as the dendritic metal structure is grown. The growth of the dendritic metal structure depletes the solid electrolyte of metal in at least the neighborhood of the dendritic metal structure.