Recent Progress of Solution-Processed Copper-based p-Channel Thin-Film Transistors

The development of well-performing p-type semiconductors is essential in pushing transparent electronics to the next frontier. Copper oxide (CuxO) is a potentially attractive hole-transport material for such applications because of its native p-type semi-conductivity, abundant availability, non-toxic nature, and low production cost. Solution-based processing methods offer many other advantages for the fabrication of metal oxides, including a high level of control over stoichiometry, microstructure, and morphology development, as well as tremendous flexibility in terms of materials and end-use architectures. This review will cover the current progress of synthesis and deposition of solution-based CuxO thin films for the purpose of thin-film transistors (TFTs). It will show the rapidly growing effort in this field to utilize low-temperature methods, nanoscale patterning, and green synthesis. Additionally, the emerging solution-processed TFTs made of nonoxide copper-based semiconductors such as halide and (pseudo) halide materials will be discussed.