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Proceedings Article

Phase Change Materials (PCM) fabricated in vertical structures for reconfigurable and tunable circuits

[+] Author Affiliations
Eduardo Barajas, Ronald A. Coutu

Air Force Institute of Technology (United States)

Proc. SPIE 8973, Micromachining and Microfabrication Process Technology XIX, 89730G (March 7, 2014); doi:10.1117/12.2037372
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From Conference Volume 8973

  • Micromachining and Microfabrication Process Technology XIX
  • Mary Ann Maher; Paul J. Resnick
  • San Francisco, California, United States | February 01, 2014

abstract

Germanium Telluride (GeTe) can be described as a non-volatile (latching state) phase change material (PCM) in memory applications. GeTe also exhibits a volatile (reversible state) region when heated and cooled between 100-180 °C. At temperatures higher than 185 °C the material crystallizes and “latches” until a temperature near to its melting point (725 °C) is reached and cooled rapidly (quenching). Germanium Antimony Telluride (GeSbTe) or also known as GST has similar characteristics as GeTe. GST also exhibits a volatile (reversible state) region when heated and cooled between 100-150 °C. GST crystallizes at 155 °C and its melting point is 600 °C. This paper demonstrates the feasibility of fabricating radio frequency (RF) devices of phase change materials (PCM) and it also presents a comparison between amorphous and crystalline PCMs in the RF spectrum. Previous work focuses on exploiting GeTe and GST as nonvolatile materials in memory applications, and also on characterizing them for their electrical and mechanical properties. The approach here focuses on fabricating RF devices and analyzing their responses. A simulation with resistor-capacitor (RC) and resistor-inductor (RL) circuits is presented to represent the response of the RF devices under testing. The fabrication process includes two-layer and four-layer devices on the Si wafer. PCMs are sputtered and the test pads are deposited using electron beam evaporation. Results show that these RF devices alone can serve as a low pass filter with a cutoff frequency of 10 MHz. © (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

Eduardo Barajas and Ronald A. Coutu
" Phase Change Materials (PCM) fabricated in vertical structures for reconfigurable and tunable circuits ", Proc. SPIE 8973, Micromachining and Microfabrication Process Technology XIX, 89730G (March 7, 2014); doi:10.1117/12.2037372; http://dx.doi.org/10.1117/12.2037372


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