한준 교수

Copper tin sulfide (Cu2SnS3) was a potential earth abundant absorber material for photovoltaic device application. In this contribution, triclinic Cu2SnS3 film with phase pure composition and large grain size was fabricated from a hydrazine solution process using Cu, Sn and S as the precursors. Absorption measurement revealed this Cu2SnS3 film had a direct optical band gap of 0.88 eV, and Hall effect measurement indicated the film was p-type with hole mobility of 0.86 cm2/Vs. Finally Mo/Cu2SnS3/

To keep pace with the era of transparent and deformable electronics, electrode functions should be improved. In this paper, an innovative structure is suggested to overcome the trade-off between optical and electrical properties that commonly arises with transparent electrodes. The structure of double-stacked metal films showed high conductivity (<3 Ω/sq) and high transparency (∼90%) simultaneously. A proper space between two metal films led to high transmittance by an optical phenomenon. The pr

In this paper, a high performance flexible component that serves as a color filter and an electrode simultaneously is suggested. The suggested highly conductive and flexible color filter electrode (CFE) has a multilayer film structure composed of silver (Ag) and tungsten trioxide (WO3). The CFE maintained its color filtering capability even when the films were bent on a polyethylene terephthalate (PET) film. Low sheet resistance of the CFE was obtained using WO3 as a bridge layer that connects t

When trans -PdCl 2 {PPh n [CH 2 C 6 H 4 O(CH 2 ) 4 CH═CH 2 ] 3− n } 2, with ortho or meta C 6 H 4 linkages and n = 0, 1 (tribenzyl- or dibenzylphenylphosphine cores), are treated with Grubbs’ catalyst and then H 2 /PtO 2, the macrocycles trans - PdCl 2 { P[CH 2 - o -C 6 H 4 O(CH 2 ) 10 O- o -C 6 H 4 C H 2 ][CH 2 - o -C 6 H 4 O(CH 2 ) 10 O- o -C 6 H 4 )CH 2 ] P[CH 2 - o -C 6 H 4 O(CH 2 ) 10 O- o -C 6 H 4 C H 2 ]}, trans -PdCl 2 { PPh[CH 2 C 6 H 4 O(CH 2 ) 10 OC 6 H 4 CH 2 ]} 2 ( o - or m -C 6 H 4

Numerous optical films have been developed to implement optoelectronics with advanced performance. In this study, we propose a color purifying optical nanothin film that improves the performance of optoelectronics by filtering the white light to have a spectrum composed of pure three primary colors of red, green, and blue. It was experimentally confirmed that a wider color gamut that covers 176.33% of the sRGB could be expressed when the suggested optical nanothin film was applied to a display s

In this paper, in contrast with previously reported approaches, we suggest exploiting a microcavity effect using nanoparticles to improve the optical efficiency of organic light-emitting diodes (OLED). The method to input the nanoparticles inside the OLED device is simple and cost effective by virtue of employing a solution process using a spin coating fabrication method. Titanium dioxide (TiO2) nanoparticles were used to improve the reflection by its high refractive index. In tandem with optimi

Admixing PCBM and its dimer as electron transport material significantly improves charge carrier dynamic behavior in inverted perovskite device.

The implementation of ultra-high-resolution displays is one of the important technologies for advanced displays. In this paper, an ultra-high-resolution organic light-emitting diode display is implemented without the fine metal mask method, but via a color conversion electrode. A red and green color ultra-high-resolution organic light-emitting diode display with a pixel size of 5 μm was experimentally realized without changing any aspects of the structure of the OLED display except for the preci

Optical multilayer thin films have a wide range of applications due to their ability to manipulate transmissive or reflective wavelengths by adjusting the thickness of composed layers, enabling diverse uses. Although their light weight, flexible nature and ease of fabrication position them as promising components for future devices, determining their optimal layer thickness for the desired functionality demands extensive simulations, leading to inefficient utilization of computational resources

In this paper, based on the multi-body dynamics simulation software, RecurDyn, virtual prototype model of a tracked mobile robot has been built, and with the RecurDyn interface connected to the Simulink control software, it was realized to build a control co-simulation platform of the tracked mobile robot. Through setting control conditions in Simulink, it was achieved to make the virtual prototype model tracking specific longitudinal motion velocity and turning velocity. The simulation results