Semiconductor wafer devices are formed of a wafer or a portion of a wafer. The wafer or wafer portion includes a plurality of functional blocks, one of which comprises an energy source and another which takes some other form, such as digital logic, data storage, a communication module, a display, a display driver, or a sensor. A functional block may be formed as part of processing of the wafer or may comprise a post-processing element. The functional blocks combine to provide an operational system having a plurality of functions. The wafer may be formed of an amorphous material, allowing the device to have a three-dimensional, non-planar structure, such as a cuboidal or tubular structure. If the device comprises only a portion of a wafer, a plurality of devices may be formed from a single wafer, with each portion being removed from the remainder of the wafer to define a device.