1. 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

2. 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.

3. 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

4. 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

5. Position dependent measurements results

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

7. 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.