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Jo, Yimhyun,Cheon, Jae Yeong,Yu, Jeonghun,Jeong, Hu Young,Han, Chi-Hwan,Jun, Yongseok,Joo, Sang Hoon The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.65
<P>We report the preparation of highly interconnected ordered mesoporous carbon–carbon nanotube nanocomposites which show Pt-like dye-sensitized solar cell (DSSC) efficiency and remarkable long-term durability as DSSC counter electrodes.</P> <P>Graphic Abstract</P><P>Nanocomposites of OMC and CNTs are prepared for Pt-free, highly efficient counter electrodes of DSSCs. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc30923h'> </P>
Kim, Jin Hyun,Jo, Yimhyun,Kim, Ju Hun,Jang, Ji Wook,Kang, Hyun Jun,Lee, Young Hye,Kim, Dong Suk,Jun, Yongseok,Lee, Jae Sung American Chemical Society 2015 ACS NANO Vol.9 No.12
<P>A stand-alone, wireless solar water splitting device without external energy supply has been realized by combining in tandem a CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> perovskite single junction solar cell with a cobalt carbonate (Co-Ci)-catalyzed, extrinsic/intrinsic dual-doped BiVO<SUB>4</SUB> (hydrogen-treated and 3 at% Mo-doped). The photoanode recorded one of the highest photoelectrochemical water oxidation activity (4.8 mA/cm<SUP>2</SUP> at 1.23 V<SUB>RHE</SUB>) under simulated 1 sun illumination. The oxygen evolution Co-Ci co-catalyst showed similar performance to best known cobalt phosphate (Co-Pi) (5.0 mA/cm<SUP>2</SUP> at 1.23 V<SUB>RHE</SUB>) on the same dual-doped BiVO<SUB>4</SUB> photoanode, but with significantly better stability. A tandem artificial-leaf-type device produced stoichiometric hydrogen and oxygen with an average solar-to-hydrogen efficiency of 4.3% (wired), 3.0% (wireless) under simulated 1 sun illumination. Hence, our device based on a D4 tandem photoelectrochemical cell represents a meaningful advancement in performance and cost over the device based on a triple-junction solar cell-electrocatalyst combination.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-12/acsnano.5b03859/production/images/medium/nn-2015-03859j_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b03859'>ACS Electronic Supporting Info</A></P>
Saji, Viswanathan S,Jo, Yimhyun,Moon, Hoi Ri,Jun, Yongseok,Song, Hyun-Kon Springer 2011 Nanoscale research letters Vol.6 No.1
<P>There are many practical difficulties in direct adsorption of polymers onto nanocrystalline inorganic oxide surface such as Al<SUB>2</SUB>O<SUB>3 </SUB>and TiO<SUB>2 </SUB>mainly due to the insolubility of polymers in solvents or polymer agglomeration during adsorption process. As an alternative approach to the direct polymer adsorption, we propose surface-bound polymerization of pre-adsorbed monomers. 6-(3-Thienyl)hexanoic acid (THA) was used as a monomer for poly[3-(5-carboxypentyl)thiophene-2,5-diyl] (PTHA). PTHA-coated nanocrystalline TiO<SUB>2</SUB>/FTO glass electrodes were prepared by immersing THA-adsorbed electrodes in FeCl<SUB>3 </SUB>oxidant solution. Characterization by ultraviolet/visible/infrared spectroscopy and thermal analysis showed that the monolayer of regiorandom-structured PTHA was successfully formed from intermolecular bonding between neighbored THA surface-bound to TiO<SUB>2</SUB>. The anchoring functional groups (-COOH) of the surface-crawling PTHA were completely utilized for strong bonding to the surface of TiO<SUB>2</SUB>.</P>
High-Temperature–Short-Time Annealing Process for High-Performance Large-Area Perovskite Solar Cells
Kim, Minjin,Kim, Gi-Hwan,Oh, Kyoung Suk,Jo, Yimhyun,Yoon, Hyun,Kim, Ka-Hyun,Lee, Heon,Kim, Jin Young,Kim, Dong Suk American Chemical Society 2017 ACS NANO Vol.11 No.6
<P>Organic inorganic hybrid metal halide perovskite solar cells (PSCs) are attracting tremendous research interest due to their high solar-to-electric power conversion efficiency with a high possibility of cost-effective fabrication and certified power conversion efficiency now exceeding 22%. Although many effective methods for their application have been developed over the past decade, their practical transition to large-size devices has been restricted by difficulties in achieving high performance. Here we report on the development of a simple and cost-effective production method with high-temperature and short-time annealing processing to obtain uniform, smooth, and large size grain domains of perovskite films over large areas. With high-temperature short-time annealing at 400 degrees C for 4 s, the perovskite film with an average domain size of 1 pm was obtained, which resulted in fast solvent evaporation. Solar cells fabricated using this processing technique had a maximum power conversion efficiency exceeding 20% over a 0.1 cm(2) active area and 18% over a 1 cm(2) active area. We believe our approach will enable the realization of highly efficient large-area PCSs for practical development with a very simple and short-time procedure. This simple method should lead the field toward the fabrication of uniform large-scale perovskite films, which are necessary for the production of high-efficiency solar cells that may also be applicable to several other material systems for more widespread practical deployment.</P>
이산화티타튬 페이스트에 TBA 첨가에 따른 염료감응 태양전지의 효율향상 및 전기화학적 분석
이민오(Minoh Lee),정초롱(Cho-long Jung),최우열(Woo-yeol Choi),조임현(Yimhyun Jo) 한국태양광발전학회 2014 Current Photovoltaic Research Vol.2 No.3
Dye-sensitized solar cells (DSSCs) are considered as promising alternatives to conventional photovoltaic device. However, commercialization of the DSSCs is restricted due to the low efficiency. In this paper, highly efficiency DSSCs were fabricated by the adding the TBA to the TiO₂ paste. TiO₂ photoanode added 0.2 M TBA in DSSCs are shown the best efficiency of 9.14 %. This result ascribed to improvement of the connection between the TiO2 nanoparticles by the addition of the optimized amount TBA. The morphology of the photoanode was observed by FE-SEM. Further investigation about the kinetics of the electrochemical processes are performed by the EIS analysis. Longest diffusion length was obtained in case adding 0.2 M of TBA to TiO₂ paste, which was matched well with the improved efficiency.