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강유전체 BiFeO<sub>3</sub>가 증착된 TiO<sub>2</sub> 전극을 이용한 염료감응형 태양전지의 효율 향상
주호용,홍수봉,이호상,전지훈,박배호,홍성철,최택집,Joo, Ho-Yong,Hong, Su Bong,Lee, Hosang,Jeon, Ji Hoon,Park, Bae Ho,Hong, Sung Chul,Choi, Taekjib 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.3
Dye-sensitized solar cells (DSSCs) based on titanium dioxide ($TiO_2$) have been extensively studied because of their promising low-cost alternatives to conventional semiconductor based solar cells. DSSCs consist of molecular dye at the interface between a liquid electrolyte and a mesoporous wide-bandgap semiconductor oxide. Most efforts for high conversion efficiencies have focused on dye and liquid electrolytes. However, interface engineering between dye and electrode is also important to reduce recombination and improve efficiency. In this work, for interface engineering, we deposited semiconducting ferroelectric $BiFeO_3$ with bandgap of 2.8 eV on $TiO_2$ nanoparticles and nanotubes. Photovoltaic properties of DSSCs were characterized as a function of thickness of $BiFeO_3$. We showed that ferroelectric $BiFeO_3$-coated $TiO_2$ electrodes enable to increase overall efficiency of DSSCs, which was associated with efficient electron transport due to internal electric field originating from electric polarization. It was suggested that engineering the dye-$TiO_2$ interface using ferroelectric materials as inorganic modifiers can be key parameter for enhanced photovoltaic performance of the cell.
초소수성 전기 분무 마이크로 추진 장치 및 마이크로 추력 측정
이영종(Young-Jong Lee),유용훈(Yong-Hoon Yoo),Si Bui Quang Tran,김상훈(Sang-Hoon Kim),박배호(Bae-Ho Park),변도영(Doyoung Buyn) 한국항공우주학회 2009 韓國航空宇宙學會誌 Vol.37 No.2
이 논문은 폴리머 기반의 전기 분무 장치를 만들기 위하여 이온빔 장치를 통하여 초소수성으로 가공 된 polytetrafluoroethylene(PTFE) 노즐을 사용하였다. 초소수성 표면을 만들기 위하여, PTFE 표면은 Ar과 O₂를 이용한 이온빔 공정 장치를 사용하였다. 최적의 표면 공정 조건은 Ar과 O₂유량 및 에너지 단위를 변화 시켜 얻을 수 있었다. 공정된 노즐의 표면 특성을 분석하기 위하여 접촉각 측정을 수행하였고, 표면의 형태적 분석을 위해 scanning electron microscope(SEM) 그리고 atomic force microscope(AFM) 측정을 하였다. 초소수성으로 공정된 노즐을 사용함으로써 보다 안정적이고 반복적인 전기 분무가 가능함을 확인 하였으며, 공정 된 노즐의 성능을 평가하기 위하여 외팔보와 이온빔으로 표면 처리 된 노즐 그리고 레이져 변위센서를 이용하여 마이크로 스케일의 추력을 측정하였다. In this article, we fabricated polytetrafluoroethylene(PTFE) nozzle treated by ion beam, in order to fabricate polymer based electrospray micro thruster with super hydrophobic nozzle. To obtain the super hydrophobic surface, PTFE surface is treated by argon and oxygen plasma treatment process. The optimal condition is investigated argon and oxygen flow rate as well as the paalied energy level for the treatment process. Fabricated nozzle was evaluated by measuring contact angle, and the surface morphology was examined by using scanning electron microscope(SEM) and atomic force microscope(AFM). We observe that jetting becomes more stable and repeatable on the treated nozzle. And to evaluate performance of fabricated nozzle, we measure micro scale thrust using a cantilever and a nozzle treated by ion beam laser displacement sensor.
이영종(Young Jong Lee),유용훈(Yong Hoon Yoo),변도영(Doyoung Byun),김상훈(Sang Hoon Kim),박배호(Bae Ho Park) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this paper, for mimic super-hydrophobic insect wing, conduct Ion-beam treatment using Argon and oxygen plasma. To fabricate super-hydrophobic surface based on polymer surface, varied Argon and Oxygen flow rate, energy level and expose time. And evaluate treated surface, perform AFM (atomic force microscope), SEM (Scanning Electron Microscope) and contact angle measurement.
Park, Bae Ho 建國大學校基礎科學硏究所 2001 理學論集 Vol.26 No.-
Fatigue problems were investigated for thin films of ferroelectric Bi-layered perovskite materials, that is, SrBi_2Ta_2O_9 and Bi_4Ti_3O_12. The bulk samples of the materials were sintered by solid reaction methods using constituent powders. Using the bulks as target materials, thin films were grown on various substrates by pulsed laser deposition methods. Many analytical methods were performed in order to find out the mechanism of imprint and fatigue problems in such thin films.