1. High-K dielectric sulfur-selenium alloys
- Author
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Susarla, Sandhya, Tsafack, Thierry, Owuor, Peter Samora, Puthirath, Anand B, Hachtel, Jordan A, Babu, Ganguli, Apte, Amey, Jawdat, BenMaan I, Hilario, Martin S, Lerma, Albert, Calderon, Hector A, Robles Hernandez, Francisco C, Tam, David W, Li, Tong, Lupini, Andrew R, Idrobo, Juan Carlos, Lou, Jun, Wei, Bingqing, Dai, Pengcheng, Tiwary, Chandra Sekhar, and Ajayan, Pulickel M
- Subjects
Macromolecular and Materials Chemistry ,Chemical Sciences ,Engineering ,Physical Sciences ,Materials Engineering - Abstract
Upcoming advancements in flexible technology require mechanically compliant dielectric materials. Current dielectrics have either high dielectric constant, K (e.g., metal oxides) or good flexibility (e.g., polymers). Here, we achieve a golden mean of these properties and obtain a lightweight, viscoelastic, high-K dielectric material by combining two nonpolar, brittle constituents, namely, sulfur (S) and selenium (Se). This S-Se alloy retains polymer-like mechanical flexibility along with a dielectric strength (40 kV/mm) and a high dielectric constant (K = 74 at 1 MHz) similar to those of established metal oxides. Our theoretical model suggests that the principal reason is the strong dipole moment generated due to the unique structural orientation between S and Se atoms. The S-Se alloys can bridge the chasm between mechanically soft and high-K dielectric materials toward several flexible device applications.
- Published
- 2019