A convertible dual purpose device has a frame movable between an expanded configuration and a collapsed configuration, supporting material connected to the frame for supporting one or more objects, handles at a first end of the frame, and a wheel at a second end of the frame. The electrically conducting organic compound is used as a constituent element in the production of electronic devices. In some embodiments, additional resilient members may be arranged to engage and retain the weight. An additional region of silicon or silicon germanium provides quantum well isolation.