Skin‐Matched Ferroelectric Triboelectric Interfaces for Self‐Powered Human‐Machine Interactions Under Ultralow Force

ABSTRACT Triboelectric nanogenerators (TENGs) have emerged as promising power sources for self‐powered human‐machine interfaces (HMIs). However, self‐powered sensing interfacing with the human body requires matching with the low‐elasticity human skin, as well as high‐efficiency energy production in response to skin interface compliance and minute skin movements. Here, we present a skin‐matched self‐powered HMI based on a ferroelectric three‐dimensional porous triboelectric interface (f‐3PT). The interconnected porous microarchitecture redistributes mechanical stress to achieve an ultralow Young's modulus (<20 kPa), enabling compliance with diverse minute skin deformations. The ultracompliant porous framework undergoes localized deformation under subtle mechanical stimuli, while uniformly dispersed ferroelectric fillers enhance dielectric permittivity and polarization. This structural‐material synergy maximizes triboelectric charge generation, achieving a power density of ∼140 mW m − 2 under an ultralow preload (<0.2 N). Furthermore, integration with a bioinspired adhesive interface and an orthogonal stretchable wrinkle electrode preserves a skin‐level effective modulus (≈80 kPa) for the fully integrated device while simultaneously providing robust skin adhesion, high breathability, and stable operation under elevated‐temperature and underwater conditions. The resulting platform enables reliable biomechanical sensing and energy harvesting from subtle human motions, offering a general design strategy for next‐generation skin‐matched self‐powered skin electronics.