Stabilization of Spontaneous Orientation Polarization by Preventing Charge Injection from Electrodes

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  • Wang Wei-Chih
    RIKEN Center for Emergent Matter Science (CEMS) Department of Applied Chemistry, National Yang Ming Chiao Tung University Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University
  • Nakano Kyohei
    RIKEN Center for Emergent Matter Science (CEMS)
  • Tanaka Yuya
    Graduate School of Science and Technology, Gunma University
  • Ishii Hisao
    Graduate School of Science and Engineering, Chiba University Center for Frontier Science, Chiba University
  • Hsu Chain-Shu
    Department of Applied Chemistry, National Yang Ming Chiao Tung University Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University
  • Tajima Keisuke
    RIKEN Center for Emergent Matter Science (CEMS)

Abstract

<p>The stability of the surface potential derived from spontaneous orientation polarization (SOP) in 2,2′,2″-(1,3,5-benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi) films was significantly improved by inserting an insulating layer at the electrode interface. The time of 20% potential loss from the initial value was extended from 1.3 days to 64 days in the dark at room temperature. Numerical simulations of the electrostatic potential in the films showed that the electrons accumulate at the surface region of the TPBi films in thermodynamic equilibrium, compensating for the internal electric field to decrease the surface potential. It was suggested that the insulating layer prevents electron injection from the electrode and stabilizes the surface potential.</p>

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