Broadband and Low-Light Photodetection in a Flexible 2d Ti3c2tx Mxene/1d-Sbsi Nanowire Heterojunction Photodetector

Detection of weak signals is a critical challenge for advanced applications in biomedical imaging, wearable electronics and autonomous vehicles. The efficacy of photodetectors in low light conditions is profoundly influenced by the minimization of noise current. To address this, we present a self-powered flexible photodiode (SFD) based on a Ti3C2Tx MXene/SbSI van der Waals heterojunction (vdWH). This architecture amplifies photocurrent generation while reducing noise. The vdWH interface inherent built in electric field facilitates rapid photogenerated carrier separation, achieving a responsivity of 880 mA/W together with fast response (16ms/30ms). With an ultra-low noise equivalent power (NEP) of ≈10−16 W/Hz1/2, the SFD is capable of detecting faint light signals. The SFD also enables precise heart rate monitoring via photoplethysmography (PPG) signals, offering a self-powered and non-invasive solution for early cardiovascular disease detection. This study establishes a foundation for the advancement of high-performance, MXene-based SFD architecture specifically for wearable health monitoring applications.

Keywords: 1D SbSI, 2D Ti3C2Tx MXene, heterojunction, self-powered, PPG signals

Suggested Citation: Suggested Citation

Nawaz, Muhammad Zubair and Ahmad, Waqas and Khaleeq, Asad and Hasan, Waqar ul and Abbas Manj, Rana Zafar and Saleem, Muhammad Shahrukh and Ullah, Inaam and Irfan, Ayesha and Hasan, Israr Masood ul and Yaqub, Muhammad and Khan Asghar, H. M. Noor ul Huda and Naz, Gul and Li, Mai and Wang, Chunrui and Illarionov, Yury, Broadband and Low-Light Photodetection in a Flexible 2d Ti3c2tx Mxene/1d-Sbsi Nanowire Heterojunction Photodetector. Available at SSRN: https://ssrn.com/abstract=5246727 or http://dx.doi.org/10.2139/ssrn.5246727