Surface-functionalized carbon nanotubes (CNTs) are introduced into lithium-doped ZnO thin-film transistors (TFTs) as an alternative to the conventional incorporation of an expensive element, indium. The crucial role of surface functionalization of CNTs is clarified with the demonstration of indium-free ZnO-based TFTs with a field-effect mobility of 28.6 cm(2) V(-1) s(-1) and an on/off current ratio of 9 × 10(6) for low-cost, high-performance electronics.
A simple, wet‐chemical method for the surface functionalization of carbon nanotubes with hydrophilic groups is introduced in Li‐doped ZnO by S. Jeong, M. H. Ham, and co‐workers, on page 1859. This results in the uniform spatial distribution of single‐walled carbon nanotubes in ultrathin ZnO‐based matrix oxides, and facilitates high‐mobility, low‐cost metal‐oxide‐based thin‐film transistors. This approach is compatible with various film formation processes, even printing processes, and enables the realization of high‐performance, cost‐effective, large‐area electronics and displays based on metal oxides.
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