An electronic device can include a charge-selective layer and an organic active layer. A pair of retaining bands connect the opposite temples of each of the eyeglasses, so that when a user dons one of the pairs of eyeglasses, the other hangs against their person, thereby being protected, secured and readily available. The first and second sensors measure a capacitance to detect proximity of a user relative to the respective sensor. The oxide grows from the substrate to fill the trench and into the substrate to provide an oxide of greater width and depth than the trench. The voltage generated thereby can be transmitted to the electrical device via a connecting line.