A Printed Diode Operating at Ultra-high Frequency

Sani, N., Svensson, M., Engquist, I., Wang, X., Andersson Ersman, P., Nilsson, D., Robertsson, M., Gustafsson, G., Cooper, P. G., and Berggren, M.
Type of publication: 
Conference item

A printed rectifying diode manufactured on a flexible substrate, operating in the GHz range, is presented. We show that silicon and silicide in the form of powder with an average particle size of 1 μm can be used as the active layer of the diode. The production of the silicon and silicide powders is fairly simple as compared to the preparation route used for e.g. silicon nanoparticle ink. Except for the bottom electrode, which is made by photolithography of aluminum on PET foil, all layers of the diode, including the powders, are all printed. DC measurements show an average current capacity of 10 μA at 2 V forward bias, and a rectification factor of about 100 at 1 V. According to the measured frequency response of the diodes their cut off frequency is around 1.7 GHz. At 1.8 GHz, which is the frequency for the Global System for Mobile Communications (GSM), the diodes still have an output signal high enough to switch a printed organic electrochromic (EC) display. To demonstrate the use of this diode in power harvesting applications, a simple integrated circuit including an antenna, the diode and an EC display was printed on a flexible substrate. The antenna is designed to capture the signal of a mobile phone working in the GSM band. The signal transmitted from the mobile phone while making a call, is transferred to the diode through the antenna. The diode rectifies the signal and produces a DC voltage which is large enough to turn on the printed EC display. Under optimum conditions the display is switched in less than 10 s.

San Francisco
United States
Published in: 
2013 MRS Spring Meeting, A7.04, oral presentation