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Emrul Kayesh, Md.,Matsuishi, Kiyoto,Chowdhury, Towhid H.,Kaneko, Ryuji,Lee, Jae-Joon,Noda, Takeshi,Islam, Ashraful Elsevier 2018 THIN SOLID FILMS - Vol.663 No.-
<P><B>Abstract</B></P> <P>The stability of perovskite solar cells (PSCs) are critically related to the perovskite crystal morphology and film quality, hence controlling the perovskite film formation is one of the key concerns. In this study, we have used four anti-solvents- toluene, chlorobenzene, <I>p</I>-xylene and ether to fabricate high quality CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> perovskite films. We investigated the surface morphology, optical and structural properties of the corresponding perovskite films. Consequently, PSCs with variation of these anti-solvents were fabricated and the respective photovoltaic performances over a period of 30 days in dark and under air mass 1.5G sunlight conditions have been observed. Our analyses onto the post fabrication of PSCs highlight that, the perovskite films formed by toluene, chlorobenzene and <I>p</I>-xylene treatment results in high efficient and stable PSCs in dark. Interestingly, the ether treated PSC had no photovoltaic response after 10 days. The toluene and chlorobenzene treated PSCs showed stable device performance and retained ̴ 90% of their initial power conversion efficiency even after 30 days light soaking. The <I>p</I>-xylene treated PSCs showed unstable performance during the same light soaking period.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Anti-solvent dependent properties of perovskite films have been studied. </LI> <LI> PSCs based on four anti-solvents treatment with high PCE have been fabricated. </LI> <LI> Stability dependent photovoltaic response on anti-solvents has been observed. </LI> </UL> </P>
Md. Emrul Kayesh,Kiyoto Matsuishi,Towhid H. Chowdhury,Ryuji Kaneko,Takeshi Noda,Ashraful Islam 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.6
In this letter, we have introduced copper chloride (CuCl 2 ) as an additive in the CH 3 NH 3 PbI 3 precursor solution to improvethe surface morphology and crystallinity of CH 3 NH 3 PbI 3 fi lms in a single solvent system. Our optimized perovskite solarcells (PSCs) with 2.5 mol% CuCl 2 additive showed best power conversion effi ciency (PCE) of 15.22%. The PCE of the PSCsfabricated by CuCl 2 (2.5 mol%) additive engineering was 56% higher than the PSC fabricated with pristine CH 3 NH 3 PbI 3 .
Homogeneous Coexistence and Phase Segregation in 1111 Iron-based Pnictides Studied via NMR
Naoki Fujiwara,Yoichi Kamihara,Satoru Matsuishi,Hideo Hosono 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We performed 75As and 51Co nuclear magnetic resonance (NMR) measurements onLaFeAsO1−xFx (La1111), a prototype of iron-based superconductors, and on Ca(Fe1−xCox)AsF(Ca1111), which has a small overlap between the antiferromagnetic (AF) and superconducting(SC) domes in the electronic phase diagram. We found in the Ca1111 series that AF and SC statescoexist homogeneously in the overlapped region, while in the La1111 series, we found that paramagnetic(PM) and SC domains coexist around the AF-SC phase boundary. The coexistence of thesedomains indicates that the AF and SC domes segregate from each other in the electronic phasediagram.
Development of Super High-Strength Bolts with Tensile Strengths of 1600 to 2000 N/mm2
Kiyosaburo Azuma,Tetsushi Chida,Toshimi Tarui,Nagayuki Matsuishi,Tadayoshi Okada 한국강구조학회 2009 International Journal of Steel Structures Vol.9 No.4
High-strength bolts with much higher strengths are effective in bolted joints of high-strength steels to reduce the number of bolts for both labor saving and more rapid construction. This project is directed at developing super high-strength bolts with a 1600 to 2000 N/mm2 ultimate strength class as the joining parts intended for steel plates with an 800 N/mm2 ultimate strength class. This paper reports the results of the investigation of the resistance to the delayed fracture of high-strength bolts, prototype and shear tests of individual bolts, and the FEM analysis of a joint including multiple bolts aligned in a line. High-strength bolts with much higher strengths are effective in bolted joints of high-strength steels to reduce the number of bolts for both labor saving and more rapid construction. This project is directed at developing super high-strength bolts with a 1600 to 2000 N/mm2 ultimate strength class as the joining parts intended for steel plates with an 800 N/mm2 ultimate strength class. This paper reports the results of the investigation of the resistance to the delayed fracture of high-strength bolts, prototype and shear tests of individual bolts, and the FEM analysis of a joint including multiple bolts aligned in a line.
Chang Yun Hee,Park Chul Hong,Matsuishi Kyoto 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.4
Through rst-principles pseudopotential calculations, we investigated the structural and the electronic properties of the lead-halide based inorganic-organic perovskites (CH3NH3)PbX3 (where X = Cl, Br and I) and inorganic perovskite CsPbX3. The electronic structures of both kinds of perovskites are found to be similar around the band edges. The electronic levels from the organic molecules are located deeply within the valence and conduction-bands, indicating that the eects of the organic molecule on the electronic and the optical properties are weak. The valence-band maximum is characterized as an antibonding hybrid state of the Pb-s and the X-p orbitals in the Pb-X chains. The conduction-band minimum is characterized as a non-bonding hybrid state of the Pb-p and the X-p orbitals. The band gaps are found to red shift with pressure. We also examined the electronic structures of the two-dimensional layered structures of the perovskites. The band gap decreased due to the connement eect of carriers with increasing number of perovskite layers.
Strong Enhancement of Superconductivity in Inorganic Electride 12CaO·7Al2O3:e− under High Pressure
Shigeki Tanaka,Tomoki Kato,Atsushi Miyake,Tomoko Kagayama,Katsuya Shimizu,Sung Wng Ki,Satoru Matsuishi,Hideo Hosono 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We present the results of the pressure dependence of the superconductivity of the inorganicelectride 12CaO·7Al2O3:e− (C12A7:e−) single crystal through the ac-susceptibility measurementunder high pressure. C12A7:e− has the cage structure and the density of states derived fromthe cages may play an important role in the superconductivity. The superconducting transitiontemperature (Tc) is 0.2 K at ambient pressure and monotonically increases up to 1.79 K at4.7 GPa. The upper critical field Hc2 and −dHc2/dT at Tc, in proportion to the density of states(DOS) at Fermi energy becomes larger under high pressure. The superconductivity in C12A7:e− ismediated by the electron-phonon interaction, and the increase of Tc with pressure may arise froma peak structure of the DOS of cage conduction band.