All-polymer thin film transistor (TFT) circuits with via-holes and resistor
s have been fabricated by an inkjet-printing technique. Solvent drops depos
ited onto an insulating polymer by the inkjet technique are found to form a
crater-like hole (see Figure), and the hole can act as a via-hole for a ve
rtical interconnection. With this technique simple integrated circuits, suc
h as inverters, can be created.