Recent Advances in Flexible Field‐Effect Transistors toward Wearable Sensors

The introduction of the “Internet of Things” (IoTs) concept has spawned a series of research and development of wearable sensors. Flexible field‐effect transistors (FETs) are considered to be potential sensing devices due to the variety of material utilization and the self‐amplifying function on electrical signals. FETs have demonstrated the ability of detecting different kinds of external stimuli and continuous monitoring functionalities. Herein, the recent progress achieved by the academia in wearable sensors based on flexible FETs, including pressure, temperature, chemical, and biological analytes, which are vital for the manufacturing of smart wearable devices, is summarized. The sensing mechanism for different sensors is introduced and an in‐depth discussion is presented, including material engineering, problems at the current stage, and future challenges. The amplification inherent of field‐effect‐transistor (FET) devices endows specific advantages for fabricating FET‐based sensors. Herein, recent advances in applications of flexible FETs in wearable electronics and environment monitoring devices, primarily focusing on perspectives of pressure, temperature, chemical, and biochemical sensors, are highlighted. An in‐depth discussion is presented on the material utilization, performance optimization, problems, and future challenges.