Phototransistors are light-sensitive transistors that convert light into electrical signals. A recent study developed a transformative design for shortwave infrared detection using carbon nanotubes (CNTs). The fabrication process involves coating hafnium oxide with a CNT solution and adding a self-aligned gate structure — eliminating the need for precise alignment required in previous methods. CNTs provide exceptionally high carrier mobility, contributing to high responsivity, high detectivity, and fast response time. Applications include night vision, space exploration, and non-invasive biological imaging.
