Fig. 1: Technologies of flexible electronics.

printed electronics fabrication technology, transfer technology for flexible electronics^85,146,147, 3D structure fabrication technology, and deformation fabrication technology. The technologies mentioned encompass several other branches. Spray coating^148,149, screen printing^64,150,151, and roll-to-roll^152,153 belong to the category of printed electronics fabrication technology. Fiber/fabric technology^154,155, 3D printing^156,157, and soft lithography^158,159 are part of 3D structure fabrication technology. Mechanically guided self-assembly technology^141,160 and kirigami techniques^129,161 fall under the category of deformation fabrication technology.