A substrate, often a flexible material such as polyethylene (PET) or polystyrene (PS), serves as the base of the device [21,46,50,55–58]. A metal-semiconductor-metal structure is typically employed, with the metals serving as electrodes and forming either ohmic or Schottky contacts with the semiconducting nanostructure [21,46,50,51,53,55–58]. The Schottky contacts may be either symmetric or asymmetric, partially depending on the work functions of the chosen metals, commonly silver paste, gold, Indium-Tin-Oxide (ITO), or platinum [21,46,50,51,53,55–58]. As a final step, the nanostructures/devices are usually encapsulated in polydimethylsiloxane (PDMS) or other polymers to protect against contamination and corrosion