Abstract
An electrically bistable device has been fabricated based on poly(N-vinylcarbazole) (PVK)-silver sulfide (Ag2S) composite films using a simple spin-coating method. Current–voltage (I-V) characteristics of the as-fabricated devices exhibit a typical electrical bistability and negative differential resistance (NDR) effect. The NDR effect can be tuned by varying the positive charging voltage and the charging time. The maximum current ratio between the high-conducting state (ON state) and low-conducting state (OFF state) can reach up to 104. The carrier transport mechanisms in the OFF and ON states are described by using different models on the basis of the experimental result.
Highlights
Organic electrically bistable devices have aroused extensive interests due to their unique advantages such as simple-fabrication process, large memory density, and lower power consumption [1,2,3]
Considering that there is no obvious hysteresis observed in the device using only PVK as active layer we suggest that the Ag2S nanocrystals play a significant role in the electrical bistability
The negative differential resistance (NDR) effect will not appear if the positive charging voltage is not large enough, which is just what happened in our test
Summary
Organic electrically bistable devices have aroused extensive interests due to their unique advantages such as simple-fabrication process, large memory density, and lower power consumption [1,2,3]. Among different candidates for electrically bistable devices, colloidal inorganic nanocrystals have been studied extensively due to their unique chemical and physical properties. Some different types of inorganic nanocrystals, such as ZnO, Cu2S, and CdSe/ZnS have been embedded into polymers to fabricate electrically bistable devices, which have exhibited clear electrical bistabilities [7,8,9,10]. These nanocrystals mentioned above, have their intrinsic defects, such as toxicity and instability, which limit their further applications [11,12]. Ag2S nanocrystals have the advantages of less toxic and good stability, which are still rarely seen in the reports of organic electrically bistable devices
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