Three dimensional Dirac semimetal thin film heterojunction photodetector: organics on Cd3As2

Abstract

Photodetector that use three dimensional (3D) Dirac Semimetal have received considerable attention because Dirac Semimetal is regarded as an ideal candidate electrode material. In this work, organics is steamed by heat on Cd3As2 thin film is used in the field of photoelectric detection. Surprisingly, the photodetector shows excellent photo response properties from 405 nm to 1550 nm. The device exhibiting high photocurrent responsivity (407 mA/W) and external quantum efficiency (58.7 %) at the wavelength of 808 nm, which Ri is more than six times than pure Cd3As2 thin film devices. Most interestingly, the NIR photocurrent responsivity of this device can reach 53.1 mA/W. Overall, the broadband photodetector based on using organics and 3D Cd3As2 Dirac semimetal thin film heterojunction is proved to better performance for photoelectric application. Moreover, organics/Cd3As2 thin film heterojunction also has advantage in low cost array devices. The use of Cd3As2 thin film and organics opens up a new path for the practical application of Dirac Semimetal materials.