Rapid and Scalable Synthesis of In₂O₃‐Decorated MXene Nanosheets for High‐Performance Flexible Broadband Photodetectors

Abstract A promising flexible photodetector based on hybrid nanocomposites of 2D MXene and In 2 O 3 nanoparticles (NPs) has been developed, demonstrating excellent ultraviolet (UV) light responsivity. In this work, In 2 O 3 ‐decorated MXene nanosheets (In 2 O 3 MX) are synthesized via a simple one‐step sonochemical method using ultrasonication, rapidly producing the composites in a short time. The synthesized material shows efficacy across broadband wavelengths (UV, Vis, NIR). Notably, the photodetector using In 2 O 3 MX exhibits a responsivity ( R ) of 121.6 A W −1 and a specific detectivity ( D *) of 106.4 × 10¹⁰ Jones in the UV range, and confirming enhanced electrical properties and the feasibility of low‐voltage detection with tau plots. Additionally, the electrical and optical characteristics remain unchanged after bending the device up to 10,000 times with a bending radius of 6.0 mm, highlighting its suitability for flexible optoelectronic applications. Overall, this study introduces a novel approach to the simple synthesis of 2D MXene nanocomposites and provides valuable insights into the development of flexible photodetectors using these materials.