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All-polymer thin film transistor (TFT) circuits with via-holes and resistors have been fabricated by an inkjet-printing technique. Solvent drops deposited 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 vertical interconnection. With this technique simple integrated circuits, such as inverters, can be created.
Kawase et al. (2001) studied this question.