ABSTRACT The ability to sense and control temperature reliably in low‐cost, flexible systems is a key enabler for advances in health monitoring, energy storage, and bioengineering. Here, we show that contact‐controlled thin‐film transistors, including source‐gated and multimodal devices, provide a powerful platform for circuit design. By exploiting the intrinsic sensitivity of charge injection at the source contact, we realize compact circuits that function either as highly sensitive temperature sensors or as temperature‐stabilized current references. These behaviors are achieved through simple changes in device geometry and topology, demonstrated experimentally on flexible microcrystalline silicon and supported by simulations. The circuits operate directly from common battery supplies without regulators, offering a manufacturable solution, compatible with a wide range of electronic materials and processes. A compact mathematical framework and a demonstrative application highlight the generality of this approach. This work establishes contact‐controlled transistors as versatile building blocks for robust, adaptive circuits in distributed electronics, with implications from wearable health technologies to chemical battery management and lab‐on‐a‐chip platforms.
Bestelink et al. (Thu,) studied this question.