We demonstrate an intrinsically fast Seebeck-type metal–semimetal–metal infrared photodetector based on Cd3As2 crystals. The Seebeck voltage is induced under off-center illumination, leading to asymmetric temperature gradients and a net current flow. The room-temperature responsivity of the sensor is 0.27 mA/W. The photocurrent signal is readily registered at a modulation frequency of 6 kHz, and the intrinsic bandwidth of the sensor is predicted to approach the terahertz range. The photocurrent depends on the optical power and modulation frequency. Our study demonstrates that crystallineCd3As2 is a promising material for high-bandwidth and spectrally broad photosensing, imaging, and communication.
Yavarishad, N., Hosseini, T., Kheirandish, E., Weber, C. P., & Kouklin, N. (2017). Room-temperature self-powered energy photodetector based on optically induced Seebeck effect in Cd3As2. Applied Physics Express, 10(5), 052201. https://doi.org/10.7567/APEX.10.052201