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ZnO 박막의 표면 거칠기 감소에 따른 역구조 유기태양전지의 효율 향상
최규채 ( Kyu Chae Choi ),이은진 ( Eun Jin Lee ),김민지 ( Min Ji Kim ),백연경 ( Youn Kyung Beak ),신평우 ( Puyng Woo Shin ),김양도 ( Yang Do Kim ),김영국 ( Young Kuk Kim ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.10
This paper describes an inverted bulk heterojunction organic solar cell featuring solution-processed zinc oxide nanoparticles (ZnO NPs) as the electron transport layer. ZnO NPs with an average diameter of ~5 nm are synthesized by a wet chemistry method. The ZnO NP layers are deposited from colloidal ZnO NPs dispersed in a mixed solvent having various volumetric ratios of chlorobenzene (CB) and isopropyl alcohol (IPA). After the coating step, the surface roughness of the coating films was reduced and that was related to the dispersion of the ZnO NP solution. The maximum performance of the solar cell was achieved when the ZnO NPs were suspended within a volumetric ratio (50 vol%:50 vol%) of CB and IPA, with a solar power conversion efficiency of 3.74% at AM 1.5 G, 100 mW/cm2 illumination.
NiO 완충층 두께 조절에 의한 OLEDs 전기-광학적 특성
최규채 ( Gyu Chae Choi ),정국채 ( Kook Chae Chung ),김영국 ( Young Kuk Kim ),조영상 ( Young Sang Cho ),최철진 ( Chul Jin Choi ),김양도 ( Yang Do Kim ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.10
In this study, we have investigated the role of a metal oxide hole injection layer (HIL) between an Indium Tin Oxide (ITO) electrode and an organic hole transporting layer (HTL) in organic light emitting diodes (OLEDs). Nickel Oxide films were deposited at different deposition times of 0 to 60 seconds, thus leading to a thickness from 0 to 15 nm on ITO/glass substrates. To study the influence of NiO film thickness on the properties of OLEDs, the relationshipsbetween NiO/ITO morphology and surface properties have been studied by UV-visible spectroscopy measurements and AFM microscopy. The dependences of the I-V-L properties on the thickness of the NiO layers were examined. Comparing these with devices without an NiO buffer layer, turn-on voltage and luminance have been obviously improved by using the NiO buffer layer with a thickness smaller than 10 nm in OLEDs. Moreover, the efficiency of the device ITO/NiO (< 5 nm)/NPB/Alq3/ LiF/Al has increased two times at the same operation voltage (8 V). Insertion of a thin NiO layer between the ITO and HTL enhances the hole injection, which can increase the device efficiency and decrease the turn-on voltage, while also decreasing the interface roughness.
Carboxylic acid가 CuInS<sub>2</sub>/ZnS 반도체 나노입자의 광학적 특성에 미치는 영향
안시현,최규채,백연경,김영국,김양도,Ahn, Si-Hyun,Choi, Gyu-Che,Beak, Yeun-Kyung,Kim, Young-Kuk,Kim, Yang-Do 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.5
We report the effect of the chain length of carboxylic acid on the photoluminescence(PL) of $CuInS_2$/ZnS nanocrystals. $CuInS_2$/ZnS nanocrystals with emission wavelength ranging from 566 nm through 583 nm were synthesized with zinc acetate and carboxylic acids with various chain length. In this study, $CuInS_2$/ZnS nanocrystals prepared using long chain carboxylic acid showed more improved PL intensity. The origin of strong photoluminescence of the nanocrystals prepared with zinc acetate and long chain carboxylic acid was ascribed to improved size distribution due to strong reactivity between long chain carboxylic acid and zinc acetate.
P3HT:PCBM 층 내 분산 가능한 금속 나노입자의 제조 및 이를 포함한 고분자 태양전지 소자의 특성에 관한 연구
김민지,최규채,김영국,김양도,백연경,Kim, Min-Ji,Choi, Gyu-Chae,Kim, Young-Kuk,Kim, Yang-Do,Baek, Youn-Kyoung 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.3
In this study, we prepare polymer solar cells incorporating organic ligand-modified Ag nanoparticles (O-AgNPs) highly dispersed in the P3HT:PCBM layer. Ag nanoparticles decorated with water-dispersible ligands (WAgNPs) were also utilized as a control sample. The existence of the ligands on the Ag surface was confirmed by FT-IR spectra. Metal nanoparticles with different surface chemistries exhibited different dispersion tendencies. O-AgNPs were highly dispersed even at high concentrations, whereas W-AgNPs exhibited significant aggregation in the polymer layer. Both dispersion and blending concentration of the Ag nanoparticles in P3HT:PCBM matrix had critical effects on the device performance as well as light absorption. The significant changes in short-circuit current density ($J_{SC}$) of the solar cells seemed to be related to the change in the polymer morphology according to the concentration of AgNPs introduced. These findings suggested the importance of uniform dispersion of plasmonic metal nanoparticles and their blending concentration conditions in order to boost the solar cell performance.