Photodetectors based on two dimensional materials for biomedical application.

Mobile medical devices provide great promise for self-health monitoring and preventive medicine. Especially, photodetectors (PDs) based on two-dimensional (2D) materials have attracted the wide interest in biomedicine and healthcare. In this review, we summarized the research progress of PDs based on 2D materials, and described the important applications of these devices in the wearable and implantable devices. We also analyzed their various properties such as sensitivity, mechanical flexibility, robustness and biocompatibility of the wearable and implantable devices. The typical biomedical application, such as UV-radiation monitor, pulse oximeters and retinal prosthesis were reviewed. We also discussed some of the technical challenges in wearable and implantable device and possible solutions. The state of art, non-invasive devices show great promising for real-time pathological monitor, health management and tracking.