연세대학교 · Engineering
이 교수의 연구실은 주로 고효율 태양전지 기술 개발에 초점을 맞추고 있으며, 특히 고분자 기반 전도성 복합체와 나노구조 투명 산화티타늄(티티오)을 활용한 고성능 다이드-센서라이즈드 태양전지(DSSC)의 설계 및 최적화를 핵심 연구 주제로 삼고 있습니다. 고분자 매트릭스와 은 이온 간의 상호작용을 제어하여 오일린 가속화 확산 메모브레인의 성능을 높이는 데에도 기여하고 있으며, 메조다공성 투명 산화티타늄 필름의 구조 제어를 통해 전하 수송과 표면적을 극대화하는 데 성공했습니다. 특히 고분자 템플릿 기반의 조직화된 다공성 타이타늄 이산화물 구조를 활용해 7.1%의 높은 변환 효율을 달성한 바 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
We report remarkably high energy conversion efficiency (4.5% at 100 mW cm(-2)) of a dye-sensitized solar cell in the solid state, using composite polymer electrolytes containing fumed silica nanoparticles.
Propylene solubility is almost 2-fold higher in 1:1 poly(2-ethyl-2-oxazoline) (POZ):AgBF4 or poly(vinyl pyrrolidone) (PVP):AgBF4 than in 1:1 POZ:AgCF3SO3 or 1:1 PVP:AgCF3SO3, according to our previous work. It is confirmed in this paper that the CC stretching band of propylene coordinated with silver cations in 1:1 PVP:AgBF4 is about 2-fold more intense than that in 1:1 PVP:AgCF3SO3. This difference in solubility is investigated here in terms of the differences in the interactions of silver cati
A facile and effective method to prepare hierarchical pine tree‐like TiO 2 nanotube (PTT) arrays with an anatase phase directly grown on a transparent conducting oxide substrate via a one‐step hydrothermal reaction. The PTT arrays consist of a vertically oriented long nanotube (NT) stem and a large number of short nanorod (NR) branches. Various PTT morphologies are obtained by adjusting the water/diethylene glycol ratio. The diameter of the NTs and the size of the NR branches decreases from 300
Randomly microphase-separated graft copolymers have been self-reorganized so as to exhibit a micellar structure with excellent connectivity upon tuning the solvent affinity. These copolymers are used as a structure-directing agent for organized mesoporous TiO(2) films with no grain boundaries, leading to enhanced solar conversion efficiency of dye-sensitized solar cells.
The role of the polymer matrix in facilitated olefin transport through polymer/silver salt complex membranes was investigated, particularly its influence on the structure and interactions of polymer/silver salt complexes and hence on the interactions of silver ions with olefin molecules. This role was assessed for complexes of silver salts with polymeric ligands containing three different carbonyl groups, specifically, amide, ketone, and ester groups. It was found that the threshold concentratio
Solid-state dye-sensitized solar cell with 7.1% efficiency at 100 mW/cm(2) is reported, one of the highest observed for N719 dye. Excellent performance was achieved via a graft copolymer-templated, organized mesoporous TiO(2) film with a large surface area using spindle-shaped, preformed TiO(2) nanoparticles and solid polymer electrolyte.
A low cost, low-temperature processable, highly efficient nickel sulfide counter electrode is demonstrated. Using the tailored, preformed nickel sulfide nanoparticles and electrostatic self-assembly, a novel counter electrode was fabricated that exceeded the efficiency of a conventional Pt-based cell.
Hierarchical nanostructures of TiO2 nanosheets on SnO2 nanotubes (SNT@TNS) are uniformly dispersed in an organized mesoporous (OM) TiO2 film with large pores, high porosity, and good interconnectivity. The solid-state dye sensitized solar cells (ssDSSCs) fabricated with 10 wt% SNT@TNS dispersed in a OM-TiO2 film show an energy conversion efficiency of 7.7% at 100 mW cm(-2) , which is one of the highest values for N719-based ssDSSCs and much larger than that of a randomly oriented TiO2 nanopartic
The coordination behavior of silver ions dissolved in a polymer solvent is investigated to elucidate the facilitated transport phenomena in solid-state membranes. Silver polymer electrolyte membranes were prepared by dissolving AgCF3SO3 in poly(2-ethyl-2-oxazoline) (POZ) or poly(N-vinylpyrrolidone) (PVP). The permeance and solubility of propylene in the silver polymer electrolyte increased slowly with silver ion concentration up to the silver mole fraction of 0.25 ([CO]:[Ag] = 3:1), after which
A high‐energy conversion efficiency of 8.2% at 100 mW cm −2 is reported, one of the highest values for N719‐based, solid‐state, dye‐sensitized solar cells (ssDSSCs). The solar cells are based on hierarchical double‐shell nanostructures consisting of inner SnO 2 hollow spheres (SHS) surrounded by outer TiO 2 nanosheets (TNSs). Deposition of the TNS on the SHS outer surface is performed via solvothermal reactions in order to generate a double‐shell SHS@TNS nanostructure that provides a large surfa
A nanopatterning technique using nanostamps that provides a facile process to create a nature‐inspired moth‐eye structure achieving high transmittance in the visible range as well as a self‐cleaning effect is reported. Commercially available perfluoropolyether (PFPE) and NOA63 as the mold resin and second replica mold material, respectively, play an important role in fabricating the structure. The structure is found to increase transmittance up to 82% at 540 nm and contact angle up to 150°, repr
