Fig. 1: ZnO as CMOS-BEOL-compatible transistor material.

a Schematic illustrating the use of low-temperature processable ZnO semiconductor, allowing for BEOL integration of logic circuits and memory array. b Schematic illustrating the fabrication process flow of the ZnO TFT. c Photo image of the fabricated sample containing the ZnO TFTs, 1T1R memory array, inverter, and ring oscillator.