Substrate structures and fabrication methods thereof

A substrate structure, comprising:

• a bendable substrate;
• an inorganic electrode structure transferred from a transferring substrate onto the bendable substrate such that the inorganic electrode structure is indented into the bendable substrate, and a top surface of the inorganic electrode is level with a top surface of the bendable substrate;
• a plurality of auxiliary electrodes on the bendable substrate and adhered with the inorganic electrode structure;
• and
• a structural layer disposed on the inorganic electrode structure and between the auxiliary electrodes, wherein a top surface of the structural layer is coplanar with top surfaces of the auxiliary electrodes,
• wherein the inorganic electrode structure comprises a conductive layer or a semiconductor layer, and
• wherein the bendable substrate comprises polyethylene (PE), polyimide (PI), polyvinyl alcohol (PVA), or polymethyl methacrylate (PMMA).