Jeong Ho Cho

A high-performance novel photodetector is demonstrated, which consists of graphene and CH3 NH3 PbI3 perovskite layers. The resulting hybrid photodetector exhibits a dramatically enhanced photo responsivity (180 A/W) and effective quantum efficiency (5× 10(4) %) over a broad bandwidth within the UV and visible ranges.

A transparent and stretchable all-graphene multifunctional electronic-skin sensor matrix is developed. Three different functional sensors are included in this matrix: humidity, thermal, and pressure sensors. These are judiciously integrated into a layer-by-layer geometry through a simple lamination process.

MXenes, an emerging class of two-dimensional (2D) transition metal carbides and nitrides, have potential for application as high-performance, low-cost electrodes in organic field-effect transistors (OFETs) because of their water dispersibility, high conductivity, and work-function tunability. In this study, we successfully fabricated a large-scale, uniform Ti₃C₂T_<i>x</i> MXene electrode array on a flexible plastic substrate for application in high-performance OFE

Transfer characteristics of ZnO thin-film transistors (TFTs) based on ZnO doped with various alkali metals. A new doping method is demonstrated by employing alkali metals to achieve high-performance and solution-processed ZnO TFTs with a low processing temperature (∼300 °C), which is applicable to flexible plastic substrates.

Lead halide perovskites with nanoscale geometries have received recent attention due to the defect-tolerant high photoluminescence quantum yield at tunable emission wavelengths and the possibility of room-temperature synthesis that does not compromise the physical properties of the materials. These characteristics offer opportunities to advance displays that cover the widest perceivable color. However, lead toxicity obstructs the commercialization of this technology. Therefore, recent efforts ha

A novel multibit MoS₂ photoelectronic nonvolatile memory device is developed by synergistically combining rational device designs and the efficient transfer of large-area MoS₂ flakes. The MoS₂ photoelectronic memory exhibits excellent memory characteristics, including a large programming/erasing current ratio that exceeds 10⁷ , multilevel data storage of 3 bits (corresponding to eight levels), performance stability over 200 cycles, and stable data rete

Graphene has been attracting wide attention owing to its superb electronic, thermal and mechanical properties. These properties allow great applications in the next generation of optoelectronics, where flexibility and stretchability are essential. In this context, the recent development of graphene growth/transfer and its applications in field-effect transistors are involved. In particular, we provide a detailed review on the state-of-the-art of graphene-based flexible and stretchable thin film

MXenes, an emerging class of 2D transition metal carbides and nitrides with the general formula M_n ₊₁ X_n T_x (n = 1-4), have potential for application as floating gates in memory devices because of their intrinsic properties of a 2D structure, high density-of-states, and high work function. In this study, a series of MXene-TiO₂ core-shell nanosheets are synthesized by deterministic control of the surface oxidation of MXene. The floating gate

The unique properties of hybrid heterostructures have motivated the integration of two or more different types of nanomaterials into a single optoelectronic device structure. Despite the promising features of organic semiconductors, such as their acceptable optoelectronic properties, availability of low-cost processes for their fabrication, and flexibility, further optimization of both material properties and device performances remains to be achieved. With the emergence of atomically thin 2D ma

Thermally stable superhydrophobic fabrics with multifunctionality were fabricated through the combination of sol–gel chemistry and electrospinning. MTES sols were electrospun into fibers, in which fiber morphology was controlled by the gelation time. The resulting superhydrophobic fabrics are not only very stable and heat-resistant but perform with high filtration efficiency, enabling emerging applications for smart materials and devices. Detailed facts of importance to specialist readers are pu

In organic field-effect transistors (OFETs), the characteristics of the interface between the organic semiconductor and the gate dielectric are crucial determinants of device performance. We review recent progress in the control of mesoscale/nanoscale ordering of organic semiconductors at the gate dielectric. Issues concerning growth of the organic semiconductor on the surface-controlled gate dielectric, in-plane alignment of organic semiconductors, and self-assembled monolayers for organic semi