Dahee Seo's research while affiliated with Korea Aerospace University and other places
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Publications (5)
A liquid Ga-based synaptic device with two-terminal electrodes is demonstrated in NaOH solutions at 50 °C. The proposed electrochemical redox device using the liquid Ga electrode in the NaOH solution can emulate various biological synapses that require different decay constants. The device exhibits a wide range of current decay times from 60 to 320...
This paper describes the heteroepitaxial growth of high-quality alpha-phase gallium oxide (α-Ga2O3) on a sapphire substrate without a buffer layer via the hydride vapor phase epitaxy method. Here, compressive strain arising from the difference in lattice constants between the substrate and α-Ga2O3 is relieved near the interface, resulting in a high...
An ionic device using a liquid Ga electrode in a 1 M NaOH solution is proposed to generate artificial neural spike signals. The oxidation and reduction at the liquid Ga surface were investigated for different bias voltages at 50 °C. When the positive sweep voltage from the starting voltage (V S) of 1 V was applied to the Ga electrode, the oxidation...
Citations
... Alternatively, heterojunctions constructed with p-type semiconductor materials featuring a direct bandgap can effectively enhance the separation and migration of photogenerated carriers, a crucial factor in improving photodetector performance. GaN, as an excellent p-type doped material, is considered a candidate for constructing heterojunctions due to its higher bandgap compared to p-Si, lower preparation cost than p-NiO, and potential for large-scale applications [25,26]. ...
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... Thus, it is critical to develop a sensitive photodetector (PD) to monitor UVC radiation during daylight hours. [10][11][12] In recent years, wide bandgap semiconductors (E g > 4.43 eV), such as AlGaN, MgZnO, b-Ga 2 O 3 , GaN, NiO, BN, and LaAlO 3 , have been increasingly used to detect solar-blind UV. Studies related to UVC detectors and their respective performance are presented in Table 1. ...
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... Very recently, an ionic device using liquid Ga was made to resemble neural spike signals, which is beneficial for organ cell−machine interface systems because Ga is biocompatible and flexible at room temperature. 29,30 Depending on the specific application, synaptic functions with different decay constants are required for synaptic devices because synaptic functions with different decay constants can affect the temporal dynamics of the network and its ability to perform certain computations, such as short-term memory or pattern recognition. 31 Synaptic decay refers to the gradual decrease in the strength of a synaptic connection over time. ...
