Textbook in PDF format Semiconducting metal oxide thin-film transistors (TFTs) are promising candidates for functional electronic devices and have attracted considerable attention due to their superior electrical performance, high transparency, excellent stability and uniformity. The book introduces the concepts and working mechanisms of semiconducting metal oxide TFTs, with a focus on metal oxide thin films that have desirable electrical and optical properties. The relationship between material properties and device performance is analysed, and materials and device challenges, as well as possible strategies, are included to promote the commercial translation of metal oxide TFT-based optoelectronic devices