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Subject: search.filters.subject.Bistable device

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    Electrical Properties of Eggshell-Derived CaO Composited with Polyvinylpyrrolidone for Bistable Device
    (2022-01-01)
    Tunhoo, Benchapol
    ;
    Onlaor, Korakot
    ;
    Songkeaw, Potiyan
    ;
    Sriyapan, Jaturon
    ;
    Thiwawong, Thutiyaporn
    In this work, bistable devices were fabricated from eggshell-derived calcium oxide (CaO). CaO powders can be obtained from the calcination of chicken eggshells at temperatures from 700-1000 °C. The properties of derived CaO were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and field-emission scanning electron microscopy. CaO was composited with polyvinylpyrrolidone (PVP) polymer to fabricate a bistable device with the device structure of ITO/PVP:CaO/Al. The maximum ON/OFF current ratio for the device was approximately 10<sup>4</sup>. In addition, the retention time operations reached higher than 10<sup>4</sup> s, which revealed the stability of the bistable device. The theoretical model and conduction mechanisms were presented to explain the behavior of the bistable device.
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    Electrical bistability of tris-(8-hydroxyquinoline) aluminum (Alq 3)/ZnSe organic-inorganic bistable device
    (2012-01-01)
    Onlaor, K.
    ;
    Tunhoo, B.
    ;
    Thiwawong, T.
    ;
    Nukeaw, J.
    We present that the electrical bistability in organic-inorganic bistable devices based on tris-(8-hydroxyquinoline) aluminum (Alq<inf>3</inf>) and zinc selenide (ZnSe) with the tri-layer structure of Alq<inf>3</inf>/aluminum (Al)/ZnSe. The current-voltage characteristics of the bistable device exhibit two electrical states as low (OFF state) and high (ON state) conductivity with ON/OFF ratio about four orders of magnitude. The conduction mechanisms in both ON and OFF states were analyzed by theoretical model. In the OFF state, the conduction mechanisms can be explained by thermionic emission model, which the ON state can be described by ohmic conduction model. The retention times of both states are more than 8000 s, and the device can reproduce continuous write-read-erase-read switching cycles. Moreover, for the organic-inorganic bistable device was kept at one year in ambient condition without encapsulation. The device still exhibited the electrical bistable behavior. Consequently, the ZnSe layer may be led to improve the lifetime property of the bistable device which acted as a self-encapsulating layer. © 2011 Elsevier B.V. All rights reserved.