Monolithically‐Fabricated All‐2D PdSe 2 Bendable Arrays With Seamless Interfaces for Multifunctional Flexo‐Opto‐Electronics
Alireza Ghanipour, Md Golam Kaium, Changhyeon Yoo, Chung Won Lee, Sang Sub Han, Jung Han Kim, Youngsang Ko, Somayya Tariq, Cody Sitkoff, Ryan Zettlemoyer, Yeonwoong JungABSTRACT
The ongoing miniaturization of electronic devices toward the sub‐nanometer node requires alternative material systems and process strategies to overcome complicated challenges such as contact/interface resistance and mechanical rigidity inherent in prevailing silicon technologies. To this end, mechanically compliant all‐two‐dimensional (2D) optoelectronic platforms are developed using monolithically fabricated palladium diselenide (PdSe 2 ) layers. Wafer‐scale 2D PdSe 2 layers directly synthesized on flexible polyimide (PI) at a low temperature of 330°C exhibit thickness‐modulated transport distinctions, i.e., semiconducting (∼3 nm thick) vs. metallic (∼15 nm thick). This intrinsic dimensional tunability enables the seamless formation of 2D/2D channel/electrode interfaces in a patterned array, thereby eliminating issues associated with conventional 3D metal contacts. Here, uniquely structured flexible all‐2D device arrays are explored for cutting‐edge flexo‐opto‐electronic applications. Specifically, a comprehensive set of optically modulated and strain‐invariant synaptic characteristics is demonstrated, suggesting unprecedented opportunities for mechanically deformable neuromorphic computing. Furthermore, introducing anisotropic strains into all‐2D arrays enables flexoelectricity‐driven current modulation, manifested as bending‐orientation‐dependent transport directionality and reversibility. Conclusively, this study establishes 2D PdSe 2 layers and their associated processability as a highly scalable and multifunctional system, offering a promising route toward emerging mechanically adaptive device technologies.