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Direct measurement of “ready-made” cations in a Ge2Sb3.4Te6.2 film

Author:
Imanishi, Yusuke, Nakaoka, Toshihiro
Source:
Journal of materials science 2019 v.54 no.9 pp. 7072-7077
ISSN:
0022-2461
Subject:
cations, electric potential, electrodes, silver
Abstract:
We have successfully observed Faradaic current in cyclic voltammetry of an amorphous Ge₂Sb₃.₄Te₆.₂ film with Ag electrodes. The Faradaic current peak was attributed to a non-reversible redox process limited by diffusion of Ag cations. The Ag cations can be generated by anodic dissolution under applied bias voltage or may exist before the voltage application as “ready-made” ions. The cyclic voltammetry demonstrated the existence of ready-made Ag cations. The concentration of the ready-made cations was 0.008 mol/cm³, which was about one-tenth of the cations formed by a voltage sweep at 3.6 V/s, and was about one-hundredth of those formed at 0.3 V/s.
Agid:
6310092