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Hikomitsu Kikuchi,Nguyen Thi Tinh Y,Yutaka Fujii,Akira Matsuo,Koichi Kindo 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Orthorombic Cu5(PO4)3(OH)4 (pseudomalachite) is a layered compound. Each Cu-O layer in thiscompound is separated by PO4 tetrahedra. The spin network in the bc-plane of a pseudomlachite iscomposed of triangles and pentagons, which will induce the spin frustration effect. This network maybe a new type of geometrically frustrated spin lattice. Magnetic susceptibility, specific heat, highfield magnetization measurements are used to study the magnetic properties of Cu5(PO4)3(OH)4 innatural mineral samples. Magnetic ordering is observed at around 4.2 K. The spin entropy changeat the transition temperature is about one-fifth times smaller than that expected for a usual longrangeorder. A 1/5 magnetization plateau is observed in the high-field magnetization curve. Theplateau is explained based on a simple model in which the spin network is assumed to be composedof chain, dimer and monomer units.
Carbon-sandwiched perovskite solar cell
Ahn, Namyoung,Jeon, Il,Yoon, Jungjin,Kauppinen, Esko I.,Matsuo, Yutaka,Maruyama, Shigeo,Choi, Mansoo The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.4
<P>Promising perovskite solar cell technology with soaring power conversion efficiencies has the common problems of low stability and high cost. This work provides a solution to these problems by employing a carbon sandwich structure, in which the fullerene bottom layer solves the stability issue and the carbon nanotube top electrode layer offers the merits of having high stability and being low-cost. Devices fabricated using different hole-transporting materials infiltrated into carbon nanotube networks were examined for their performance and stability under constant illumination in air. Polymeric hole-transporting layers show much higher stability when combined with carbon nanotubes due to their compact nature and stronger interaction with the carbon network. As a result, the encapsulated device showed high stability both in air and under light illumination, maintaining up to 80% of the initial efficiency after 2200 hours under actual operation conditions. Cost analysis also shows that using the polymeric hole-transporting materials in carbon nanotube films brings the fabrication cost down to less than 5.5% that of conventional devices. Our study proposes a promising cell structure toward highly stable and low-cost perovskite photovoltaic technologies for the future.</P>
Li, Chang-Zhi,Chien, Shang-Chieh,Yip, Hin-Lap,Chueh, Chu-Chen,Chen, Fang-Chung,Matsuo, Yutaka,Nakamura, Eiichi,Jen, Alex K.-Y. Royal Society of Chemistry 2011 Chemical communications Vol.47 No.36
<P>A facile synthesis was employed to make a 56π-electron methano-PC<SUB>61</SUB>BM with a very small 1,2-dihydromethano (CH<SUB>2</SUB>) group. This new fullerene derivative possesses high electron mobility (0.014 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>) and higher LUMO energy level (0.15 eV) than PC<SUB>61</SUB>BM. Bulk hetero-junction devices based on using poly(3-hexylthiophene) and methano-PC<SUB>61</SUB>BM as active layer exhibited better performance and thermal stability than those using the PC<SUB>61</SUB>BM analogue.</P> <P>Graphic Abstract</P><P>We have designed and synthesized a new 56π-electron methano-PC<SUB>61</SUB>BM using a very small and stable 1,2-dihydromethano (CH<SUB>2</SUB>) group. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc14446d'> </P>
Sakaguchi, Takahiro,Jeon, Il,Chiba, Takaaki,Shawky, Ahmed,Xiang, Rong,Chiashi, Shohei,Kauppinen, Esko I.,Park, Nam-Gyu,Matsuo, Yutaka,Maruyama, Shigeo Cambridge University Press (Materials Research Soc 2018 MRS Communications Vol.8 No.3
<▼1><B>Abstract</B><P/></▼1><▼2><P>Lead halide perovskite solar cells (PSCs) with a structure of glass/FTO/TiO2/CH3NH3PbI3 with single-walled carbon nanotubes (SWNT) as the transparent top electrodes, followed by polymethyl methacrylate (PMMA) over-coating were fabricated. The SWNT-based PSCs do not require expensive metal electrodes and hole-transporting materials yet produce a decent power conversion efficiency of 11.8%, owing to the densifying effect of SWNTs by PMMA. The resulting devices demonstrate reduced hysteresis, improved stability, and increased power conversion efficiency.</P></▼2>
Mitsushige, Yusuke,Yamaguchi, Shigeru,Lee, Byung Sun,Sung, Young Mo,Kuhri, Susanne,Schierl, Christoph A.,Guldi, Dirk M.,Kim, Dongho,Matsuo, Yutaka American Chemical Society 2012 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.134 No.40
<P>Two types of thieno-bridged porphyrins were synthesized by incorporating a thiophene group across their meso and β positions with different directions of the thiophene ring to investigate the aromaticity of these porphyrins with extended π-systems. The 2,3-thieno-bridged porphyrin showed a larger antiaromatic contribution than did the 3,4-thieno-bridged porphyrin. In the former, the antiaromatic contribution is based on a 20-π-electron conjugated circuit. The two thieno-bridged porphyrins were characterized by calculations of nucleus-independent chemical shift and anisotropy of the induced current density as well as by X-ray crystallography, NMR spectroscopy, UV–vis–NIR absorption spectroscopy, electrochemical studies, time-resolved excited-state analysis, and two-photon absorption cross section measurements. Chemical derivatization of the 2,3-thieno-bridged porphyrin was also demonstrated.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2012/jacsat.2012.134.issue-40/ja3082999/production/images/medium/ja-2012-082999_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja3082999'>ACS Electronic Supporting Info</A></P>