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High-K dielectric sulfur-selenium alloys.

  • Author(s): 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;
  • Ajayan, Pulickel M
  • et al.
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.

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