2D group 6 transition metal dichalcogenides toward wearable electronics and optoelectronics

Wearable electronic and optoelectronic devices accommodable to various mechanical deformations are becoming increasingly ubiquitous in various realms spanning electronic skins, electronic eyes, intelligent wristbands, lenses, smartphones/watches/glass, robotics, foldable screens, autonomous artificial intelligence systems, etc., which, however, are beyond the scope of conventional bulky semiconductors. Fortunately, 2D group 6 transition metal dichalcogenides (TMDCs) emerge as alternatives, having advantages of strong mechanical strength, high conformability, semitransparency, high biocompatibility, large surface-to-volume ratio, and favorable bandgaps. Highlighting an indispensable physical foundation for reliable wearability, this perspective begins with an elaboration on the structural and mechanical attributes of 2D TMDCs. Then, the latest research advancements of wearable electronic and optoelectronic devices built on them, including field-effect transistors, gas/ion/bio/tactile sensors, photodetectors, and proof-of-concept novel applications, such as electronic noses, flexible displays, and the underlying working mechanisms, are compactly surveyed. This leads us to come up with the predominant challenges standing in the way of further development, and strategies addressing them, along with associated physical principles that are comprehensively outlined. Published under license by AIP Publishing.