R&D: Challenges in Phase-Change Memory, Focus on GST and In2Se3 PCM Materials

physica status solidi (pss) basic solid state physics has published an article written by Diksha Thakur, and Vir Singh Rangra, Department of Physics, Himachal Pradesh University, Summer Hill, Shimla, 175001 India

Abstract: “Phase-change memory (PCM) represents a next-generation advancement in nonvolatile data storage technology. Its potential stems from high scalability, rapid switching response, and long-term data stability, making it suitable for nanoscale applications. PCM operates by inducing structural transitions within phase-change materials, toggling between an ordered crystalline state and a disordered amorphous phase. This transformation significantly alters optical and electrical characteristics, which is crucial for electronic applications and optical data recording. Among notable phase-change materials, GST225 and In₂Se₃ exhibit remarkable switching properties, enabling efficient information storage. In this article, we have discussed GST225 and In₂Se₃ phase change materials. PCM technology presents significant advantages, but there are several challenges and limitations which must be addressed for it to become a universal memory solution. Some of these challenges such as switching speed, data retention, power consumption, and cycling endurance are discussed in this article.“