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코팅프로세스로 제작된 P3HT:PCBM/Cu nanoparticle기반 태양전지 효율 연구
Manoj Ovhal,백승은,오은체,황윤영,임수만 한국화상학회 2017 한국화상학회지 Vol.23 No.4
표면 플라즈마 처리된 Cu nanoparticle (NPs)로 제작된 Organic photovoltaic (OPV)소자는 일잔 OPV 소자보 다 높은 효율성을 보여준다. Nps는 다양한 합성법으로 제조되어 29 nm의 지름을 가진 입자형태를 갖추었다. 이러한 Nps는 P3HT:PCBM과 결합하여 OPV 활성층으로 사용되었는데 적층방법으로 spin과 bar 코팅 방식을 사용하였다. 제작된 소자의 효율 평가에서 스핀코팅으로 제작된 P3HT:PCBM과 Nps가 결합된 P3HT:PCBM 이 각각 1.01과 4.39%로 Np의 효과로 인한 효율 증가를 볼 수 있었다. 바코팅 프로세스를 (8, 20, 50 um 갭)를 사용하였을 경우 20 um 갭의 바코터에서 스핀코터와 같은 두께의 활성층 두께를 보였다. 제작된 활성층은 바코터 그루브 특성으로 인해 트렌치 패턴이 형성되어 빛 흡수를 약화시켜 효율성을 저하시켰다. The Organic Photovoltaic (OPVs) devices with the Surface Plasmon effect embedded surface modified Copper nanoparticls (NPs) have shown higher efficiency than normal OPVs. Surface modified Copper (Cu) NPs were synthesis by chemical route. SEM images shows, the Cu NPs were spherical with the size approximately 29 nm. These NPs were incorporated in active layer of P3HT: PCBM. This active layer in OPVs devices were fabricated by spin and bar coating. The spin coated pristine and Cu NPs doped P3HT: PCBM shows 1.01 and 4.39 % efficiency. Which indicated the Cu NPs improves the efficiency significantly due to the Surface Plasmon effect. In Bar coating 8, 20 and 50 μm wire gauge bar is used for the fabrication of active layer. The 20 μm wire gauge bar shows approximately 180 to 200 nm thickness of active layer, same thickness to the spin coated OPVs. The bar coated OPVs have trench and grooves in active layer, leads to decrease in light absorption. Therefore, the Bar coated OPVs shows significant decrease in the efficiency compare to spin coated OPVs.
Fabrication of Copper Nanoparticles Incorporated P3HT: PCBM Solar Cell with solution processes
Manoj Ovhal,Sooman Lim(임수만),Jaewook Kang(강재욱) 융복합지식학회 2019 융복합지식학회논문지 Vol.7 No.1
본 연구는 용액공정 즉, 스핀 코팅, 바 코팅 및 스크린 프린팅 공정을 이용하여 구리나노입자 첨가형 P3HT : PCBM 태양 전지를 제조하였고 생산 된 효율을 비교 하였다. 여기서,은 (Ag) 상부 전극은 금속 증착에 의해 증착되고 미리 증착 된 폴리머 박막 상에 스크린 인쇄로 인쇄하여 비교실험하였다. 시트 저항 (Rsh)은 각각 0.7 Ω □<SUP>-1</SUP> 및 2 Ω □<SUP>-1</SUP> 이었고, 두께는 100 nm 및 80 nm이었다. 그 결과, OPV에서 스핀 코팅 및 바 코팅을 하고 금속 증착 된 효율은 각각 4.39 및 0.63 %의 효율을 나타냈지만 스크린 인쇄 된 Ag 전극 OPV는 단락문제를 야기시켰다. 이것은 스크린 인쇄기 압착기가 OPV에 가한 인장력으로 인해 활성층 구조가 데미지를 입었기 때문으로 사료된다. 한편, 스핀 코팅 공정은 주변 조건에서 수행 된 바 코팅 공정에 비해 신뢰성이 높았으나, 바 코팅으로 처리된 활성층은 OPV 구조에서 대면적 제조용으로 사용될 가능성을 볼 수 있었다. 그러나 스크린 프린팅의 경우, OPV 제조 공정에서 스크린 프린팅 공정을 채택하기 위해서는 스퀴즈로 인한 상층 손상을 제거하기위한 더 많은 연구가 필요하다. The present work is mainly focused on fabrication of copper nanoparticles incorporated P3HT: PCBM solar cell top electrode with spin coating, bar coating and screen-printing process and the efficiency produced by each method was compared. Herein, Silver (Ag) top electrode deposited by metal evaporation and screen printing on pre-deposited polymeric thin film. The sheet resistance (Rsh) of Ag electrodes were 0.7 Ω □<SUP>-1</SUP> and 2 Ω □<SUP>-1</SUP> with the thickness of 100 nm and 80 nm respectively. As a result, the metal evaporated Ag electrode based OPV coated by spin coating and bar coating in active layer shows 4.39 and 0.63 % efficiency, respectively. Whereas, the screen-printed Ag electrode OPVs were shorts. This short problem was raised due to the impression force applied by screen printer squeezer on the OPVs. Although spin coating process was more reliable compared with bar coating process performed in ambient condition, bar coated active layer has shown possibility to be used in OPV structure. For screen printing, however, more research to remove upper layer damage caused by squeezing was required to adapt screen-printing process in the OPV fabrication process.
Manoj Mayaji Ovhal,Hock Beng Lee,Neetesh Kumar,오진우,강재욱 한국고분자학회 2024 폴리머 Vol.48 No.2
Pseudocapacitive metal hydroxide nanostructures are promising active electrode materials for supercapacitor applications. Here, we demonstrate the in-situ growth of nickel hydroxide (Ni(OH)2) nanostructures on filamentous M13 bacteriophage template. The M13-Ni(OH)2 bio-nanostructure exhibits a fibrous morphology and a preferential growth orientation along the (001) crystal plane. Interestingly, the M13-Ni(OH)2 electrode demonstrates superior electrochemical properties. The areal capacitance (Ca) of M13-Ni(OH)2 and Ni(OH)2 electrodes was 18 mF/cm2 and 14 mF/cm2, respectively, indicating a 28% increase. The improved electrochemical performance is due to the increased surface roughness, enhanced charge adsorption/desorption sites, and reduced charge transfer resistance. This also contributed to an 18% increase in cyclic stability compared to the Ni(OH)2 electrode analogue. Overall, this work successfully shows the use of a bio-template to control the growth of novel metal-oxide nanostructures for energy storage applications.
Conductive Polymer Based Stretchable Electrode for All-Solid-State Supercapacitor
Manoj Ovhal,강재욱 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
The conducting polymers (CP) limited their feasibility in stretchable electronics due to their inheritance properties. The cross-linkage between CP and non-ionic surfactant helps to improve the conductivity, transparency, and mechanical strain. In this work, 6 vol% Triton X-100 doped CP electrode exhibits DC conductivity (3622 S/cm), transparency (92%), and electrical conductivity retention (92%) under repetitive stretch-release cycles at 100% tensile strain. The CP electrode shows stable performance due to the π-π stacking interaction and O-H stretching confirmed by ATR-FTIR. Furthermore, the CP electrode shows the areal capacitance of 2.1 mF/cm<sup>2</sup> at a scan rate of 20 mV/s. The results confirm the CP can greatly boost the chances to implant in next-generation smart stretchable all-solid-state supercapacitor.
Surfactant Assisted Conductive Polymer for Stretchable Electrode
Manoj Ovhal,강재욱 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
The stretchable electrodes based on conductive polymers (CPs) that can retain their electrochemical performance under tensile strain are important for wearable electronics. The inheritance properties of CPs can be tuned by cross-linking with a surfactant that resulted in superior conductivity and stretchability. In this work, surfactant assisted CP stretchable electrodes show electrical conductivity retention up to 92% under repetitive stretch-release cycles at 100% tensile strain. The CP electrodes show stable performance due to the π-π stacking interaction and O-H stretching confirmed by ATR-FTIR. Furthermore, the CP electrodes show the areal capacitance of ~2.1 mF/cm² at a scan rate of 20 mV/s. The results confirm the stretchable electrodes can greatly boost the chances to implant in next-generation smart stretchable all-solid-state supercapacitor.