Abstract
An organic/inorganic bistable device is fabricated by using a simple spin-coating technique, in which the hybrid silver sulfide (Ag2S) poly(N-vinylcarbazole) (PVK) nanocomposite film is sandwiched between two electrodes. An obvious electrical hysteresis is observed in the current-voltage (I-V) curve of the device measured in the presence of different oxygen concentrations, and the magnitude of the electrical hysteresis is decreased with a decrease of the oxygen concentrations. The electrical bistability of the device exhibits a strong dependence on the oxygen concentrations, and the current variation of the OFF state is higher than that of the ON state with the gas atmosphere changing from N2 to air. Different theoretical models have been employed to describe the carrier transport mechanisms of the device in the OFF and ON states measured in different gas atmospheres on the basis of the experimental I-V results, and the carrier transport of the device in the ON state measured in air is very different from that measured in N2 and low O2 concentrations due to the participation of oxygen vacancies in the trapping and de-trapping processes of electrons into and out of the Ag2S/PVK heterointerface.
Highlights
In the past few decades, organic electrically bistable devices have attracted much attention due to their potential applications in the generation of nonvolatile memory technology [1,2,3]
The in the current-voltage (I-V) characteristics of the organic/inorganic electrically bistable devices based on hybrid Ag2S/PVK nanocomposites are shown in Fig. 2a, which are measured in air and in N2 atmosphere under the sweeping voltage from −15 to 0, 0 to15, 15 to 0, and 0 to −15 V, respectively
In order to get a further understanding of the conducting mechanism of the electrically bistable devices based on hybrid Ag2S/PVK nanocomposites measured under different atmospheres, the data fitting of the I-V characteristics for the devices has been performed by using the following three theoretical models of organic electronics: the thermal emission (TE) model, space-charge-limitedcurrent (SCLC) model, and Ohmic conduction model, which are typically used for studying the carrier transport of organic devices [20,21,22,23,24]
Summary
In the past few decades, organic electrically bistable devices have attracted much attention due to their potential applications in the generation of nonvolatile memory technology [1,2,3]. Various candidates have been exploited to be used in electrically bistable devices, in which hybrid inorganic/organic nanocomposites have currently aroused broad interests due to their simple fabrication and low cost [4,5,6]. A typical device structure for the hybrid organic/inorganic bistable device is a single nanocrystal/polymer hybrid layer sandwiched. An obvious electrical bistability was observed in the hybrid organic/inorganic nanocomposites [15], but the environmental gas effects on the electrical bistability and working mechanism were not discussed. Based on our previous work, the effects of environmental gas on the electrical bistability of the devices were studied, and the devices were fabricated based on hybrid organic/inorganic Ag2S/ poly(N-vinylcarbazole) (PVK) nanocomposites through a simple spin-coating technique. On the basis of the experimental results, different organic electronic models were employed to describe the carrier transport of the electrically bistable devices
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