Sungm Cho
Sungkyunkwan University · 工学
研究室紹介
Professor Sungm Cho's research lab specializes in advanced optoelectronic materials and devices, with a strong focus on organic and hybrid semiconductors for sustainable energy and next-generation lighting. Key research directions include the development of transparent and mesoporous photoelectrodes for solar water splitting, graphene-based encapsulation for flexible organic electronics, and high-efficiency polymer solar cells and white light-emitting diodes through nanostructured charge transport layers. The lab also investigates fundamental electron transport phenomena in semiconductors, particularly impact ionization and scattering mechanisms, to guide the design of high-performance electronic devices.
Research Overview
Research Output Trend
Figures are computed from collected data and may differ slightly.
Selected Papers
15Tungsten trioxide (WO3) films with a mesoporous morphology, high transparency, and monoclinic phase crystallinity were prepared using polyethyleneglycol (PEG) as a surfactant and their photoelectrochemical properties were measured. By controlling the weight ratio of the tungsten precursor to PEG, a sphere-like WO3 nanoparticle film with high transparency can be synthesized. The photocurrent responses of the films under 1 sun solar light illumination were measured. Due to the high transparency of
Preventing reactive gas species such as oxygen or water is important to ensure the stability and durability of organic electronics. Although inorganic materials have been predominantly employed as the protective layers, their poor mechanical property has hindered the practical application to flexible electronics. The densely packed hexagonal lattice of carbon atoms in graphene does not allow the transmission of small gas molecules. In addition, its outstanding mechanical flexibility and optical
We have successively fabricated inverted bulk heterojunction polymer solar cells employing ZnO and MoO3as electron and hole selective layers, respectively. The device structure is ITO/ZnO/P3HT: PCBM/MoO3/Al. Differently from conventional polymer solar cells, ITO and Al work as electron and hole collecting electrodes in this inverted structure, respectively. We have found the optimal thickness of ZnO and MoO3 to be 100 nm and 5 nm, respectively. The highest PCE was obtained to be 3.32% under AM 1
An approximate solution of the Boltzmann transport equation is used to arrive at an expression for the electron energy distribution function. All major scattering mechanisms, including intervalley scattering, are included, and a distinction is made between nonpolar (Si, Ge) and polar (GaAs) optical phonon scattering. Numerically calculated impact ionization coefficients for electrons and holes in Ge, Si, and GaAs compare favorably with almost all experimental results reported in the literature.
Enhanced efficiency of white polymer light-emitting diodes (PLEDs) was observed by incorporating polysilicic acid (PSA) nanodots into the hole-injection layer (HIL). The PLEDs employed three different phosphorescent dyes in a single emissive layer with a host polymer of poly(vinylcarbazole) (PVK). The optimal composition of the phosphorescent dyes has been found to accomplish the white emission. By incorporating 1.5 wt% of PSA nanodots into the HIL, the maximum efficiency has been found to incre