Multimodal Piezotronic‐Gated Ferroelectric Tunneling Junctions for High‐Resolution Tactile Imaging

Multimodal perception is critical for applications such as virtual reality and human interaction by integrating information to improve the accuracy and reliability of perceiving the external environment. However, conventional single‐mode mechanical sensors frequently encounter the trade‐off between sensitivity and dynamic range, limiting their performance in complex tactile environments. Here, we propose an ultrasensitive multimodal strain sensor based on a piezotronic‐gated ferroelectric tunneling junction (PFTJ). By utilizing ferroelectric polarization to set the initial interfacial barrier and strain‐induced piezoelectric potential for dynamic modulation, the PFTJ achieves simultaneous control over tunneling barrier height and width. This dual‐mode mechanism yields exceptional gauge factors of 2.4 × 10 4 and 9.0 × 10 5 in the polarization‐down and polarization‐up states at strains of −0.78‰ and −1.34‰, respectively. The device can precisely sense subtle textures, with its multimodal nature increasing the silhouette score by 3.6 times. Furthermore, the PFTJ demonstrates state‐of‐the‐art real‐time tactile imaging, achieving a high frame rate of 89 frames per second (FPS) and an unprecedented pixel density of 6.6 × 10 7 pixels per inch (PPI). Unlike electrode‐defined crossbar arrays, the pixels here are defined by nanoflake locations and activated synchronously during scanning, ensuring a 99.95% active pixel percentage and a millisecond response time. This work provides a fundamental framework for multimodal PFTJs, advancing the development of next‐generation electromechanical sensors for high‐performance tactile imaging and adaptive human–machine interfaces.