N.Yavarishad1, T.Hosseini1, E.Kheirandish1,C.P.Weber2 and N.Kouklin1

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Presentation transcript:

Room-temperature, self-powered energy photo-detector based on Crystalline Cd3As2 N.Yavarishad1, T.Hosseini1, E.Kheirandish1,C.P.Weber2 and N.Kouklin1 1Department of Electrical Engineering, University of Wisconsin-Milwaukee 2Department of Physics, Santa-Clara University

Overview: Cd3As2 is a 3D Dirac semimetal that features: large electron mobility low thermal conductivity large thermopower Seebeck effect Cd3As2 is great candidate for applications ranging from ultra-fast IR sensors to energy conversion.

Cd3As2 Synthesis :Chemical Vapor Deposition (CVD) Precursor: pure, polycrystalline Cd3As2 chunks Growth substrate: quartz placed in the temperature range of 150 to 200 °C Carrier gas: Argon at the rate of 0.2 L/min

EDX, SEM and FTIR EDX spectrum of Cd3As2 platelet with the inset top-view, SEM image of the platelet; the bar is 10 μm. Infrared (FTIR) absorption spectrum of a Cd3As2 platelet

Position dependent measurements results

Frequency dependent measurements results Off/on transient photocurrent plot Figure 9. Off/on transient photocurrent plot.

Conclusions A room-temperature infrared photosensor based on Cd3As2 was engineered. The photo-response was successfully tested at the light modulations up to 6 kHz. The demonstrated detector is robust, requires no bias, and its responsivity to light reaches 0.27 mA/W. The study can potentially open the door to the development of low-cost unpowered, fast light detectors and switches.