https://scholar.gist.ac.kr/handle/local/7938 2025-12-08T07:47:43Z https://scholar.gist.ac.kr/handle/local/25623 Title: 환경모니터링을 위한 표면증강라만분광(SERS) 바이오센서 기술 Author(s): 김민곤 2009-06-22T15:00:00Z https://scholar.gist.ac.kr/handle/local/15055 Title: 특집 : 기능성 펩토이드의 합성과 응용 Author(s): 남호연; 서지원 2014-07-31T15:00:00Z https://scholar.gist.ac.kr/handle/local/13207 Title: 이트륨 함량에 따른 Pd-Ir-Y 3원계 합금 촉매 입자의 특성과 산소 환원반응의 활성 비교 Author(s): 김도형; 이은애; 박찬호 Abstract: To enhance catalyst activity of the palladium (Pd) towards oxygen reduction reaction (ORR), iridium (Ir) and yttrium (Y) were alloyed by polyol method. Due to the low reduction potential of Y, it is hard to reduce Y ion completely by polyol method. In XPS spectra, the binding energy of the Pd is shifted to a lower value, which indicates the d-electron of Pd is filled by the electron from the Y. And other phases of Y are observed by the XPS. Among the catalysts, the Pd4IrY0.1/C showed the best activity towards ORR, which indicates the metallic Y is effective for improving the catalytic activity. Thus, for further enhancing ORR activity, the novel method for complete reduction of Y is needed. 2018-06-30T15:00:00Z https://scholar.gist.ac.kr/handle/local/21700 Title: 유기전해질을 Dual-side Passivation 층으로 도입한 고효율 고안정성 페로브스카이트 태양전지 Author(s): Kim, Hee Joo; Kim, Ju-Hyeon; Kim, Yong Ryun; Lee, Kwang Hee Abstract: Interface engineering at the interface between the perovskite layer and the charge transport layer (CTL), or CTL and metal electrodes, is critical for demonstrating the efficient and stable perovskite solar cells (PSCs). Herein, we demonstrate the efficient and stable PSCs by introducing the organic electrolytes (OEs) as a “dual-side passivation layer” in both p-i-n and n-i-p configuration of PSCs. Firstly, a newly synthesized bathocuproine (BCP)-based nonconjugated polyelectrolyte (poly-BCP) is introduced between the tin oxide (SnO2) CTL and the perovskite layer in the n-i-p configuration. Poly-BCP effectively passivate oxygen-vacancy defects of the SnO2 side and simultaneously scavenges ionic defects of perovskite side, suppressing both bulk and interfacial nonradiative recombination in PSCs. As a result, the modified PSCs exhibited a high power conversion efficiency (PCE) of 24.4% and a high open-circuit voltage of 1.21 V. Furthermore, the non-encapsulated PSCs show excellent long-term stability by retaining 93% of the initial PCE after 700 h under continuous 1-sun irradiation in nitrogen atmosphere conditions. Secondly, amine-functionalized small molecule electrolytes (SMEs) are introduced as passivation layer between the PCBM CTL and metal electrode (here, Cu) in the p-i-n configuration. A strong coordination bond of Cu─N forms at the Cu/SMEs interface, leading to the layer–layer growth mode for the dense formation of Cu electrodes with a strong adhesion to the CTL. Thus, this modified electrode prevents the ingress of moisture into the PSCs, resulting in outstanding moisture stability; the efficiency of non-encapsulated PSCs retains 90% of the initial PCE after 200 days of exposure to atmospheric air (25 ℃, relative humidity [RH] ~20–40%). Under harsher conditions (e.g., 25 ℃/RH65%, 25 ℃/RH85% and immersion in water) for a considerable time period, the modified PSCs manifest relatively no degradation compared with the pristine PSCs. 2023-03-30T15:00:00Z