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Proceedings Paper

Phase Change Materials (PCM) fabricated in vertical structures for reconfigurable and tunable circuits
Author(s): Eduardo Barajas; Ronald A. Coutu
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Paper 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.

Paper Details

Date Published: 7 March 2014
PDF: 9 pages
Proc. SPIE 8973, Micromachining and Microfabrication Process Technology XIX, 89730G (7 March 2014); doi: 10.1117/12.2037372
Show Author Affiliations
Eduardo Barajas, Air Force Institute of Technology (United States)
Ronald A. Coutu, Air Force Institute of Technology (United States)

Published in SPIE Proceedings Vol. 8973:
Micromachining and Microfabrication Process Technology XIX
Mary Ann Maher; Paul J. Resnick, Editor(s)

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