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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>