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Rehman, Atteq ur,Khan, Muhammad Farooq,Shehzad, Muhammad Arslan,Hussain, Sajjad,Bhopal, Muhammad Fahad,Lee, Sang Hee,Eom, Jonghwa,Seo, Yongho,Jung, Jongwan,Lee, Soo Hong American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.43
<P>Molybdenum disulfide (MoS2) has recently emerged as a promising candidate for fabricating ultrathin-film photovoltaic devices. These devices exhibit excellent photovoltaic performance, superior flexibility, and low production cost. Layered MoS2 deposited on p-Si establishes a built-in electric field at MoS2/Si interface that helps in photogenerated carrier separation for photovoltaic operation. We propose an Al2O3-based passivation at the MoS2 surface to improve the photovoltaic performance of bulklike MoS2/Si solar cells. Interestingly, it was observed that Al2O3 passivation enhances the built-in field by reduction of interface trap density at surface. Our device exhibits an improved power conversion efficiency (PCE) of 5.6%, which to our knowledge is the highest efficiency among all bulklike MoS2-based photovoltaic cells. The demonstrated results hold the promise for integration of bulklike MoS2 ails with Si-based electronics to develop highly efficient photovoltaic cells.</P>
A Note on Skew-commuting Automorphisms in Prime Rings
ur Rehman, Nadeem,Bano, Tarannum Department of Mathematics 2015 Kyungpook mathematical journal Vol.55 No.1
Let R be a prime ring with center Z, I a nonzero ideal of R, and ${\sigma}$ a non-trivial automorphism of R such that $\{(x{\circ}y)^{\sigma}-(x{\circ}y)\}^n{\in}Z$ for all $x,y{\in}I$. If either char(R) > n or char (R) = 0, then R satisfies $s_4$, the standard identity in 4 variables.
Ur Rehman, Zeeshan,Uzair, Muhammad,Lim, Hyung Tae,Koo, Bon Heun Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.726 No.-
<P><B>Abstract</B></P> <P>CeO<SUB>2</SUB> nanoparticles are highly recognized for their catalytic role in various energy applications. The phenomenon of switching between the stable oxidation states (+4, +3) of cerium is considered as the main cause of its catalytic activity. In this report cerium rich ceramic coating was prepared on AZ91D magnesium alloy. From the EDS analysis, it was confirmed that CeO<SUB>2</SUB> particles were preferentially sited in the pores, cracks and the radial zones around the pores. The presence of ceria and cerium based intermetallic species in the XRD pattern established the generous involvement of the ceria nanoparticles in the PEO reactions. The Raman results showed particular bands related to the catalytic ceria and supported the XRD outcomes. Due to the compact and cerium-rich inner layer due to its optimum catalytic role, the coating prepared for 30 min was found to have the highest corrosion resistance measured through EIS and potentiodynamic polarization experiments.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PEO coatings were produced on AZ91 Mg alloy in CeO<SUB>2</SUB> nanoparticle based solution. </LI> <LI> XRD, EDS and Raman results confirmed the chemical involvement of CeO<SUB>2</SUB> particles. </LI> <LI> Increasing the processing time ∼30 min, revealed the benign catalytic role of CeO<SUB>2</SUB>. </LI> <LI> Enhanced corrosion resistance ∼706.4 × 10<SUP>3</SUP> Ω/cm<SUP>2</SUP> and nobility ∼ −0.36 V was achieved. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The involvement of various electrolyte species in the PEO process.</P> <P>[DISPLAY OMISSION]</P>
Vertically Aligned ZnO Nanorods: Effect of Synthesis Parameters
Rehman, Zeeshan Ur,Heo, Si-Nae,Cho, Hyeon Ji,Koo, Bon Heun American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.6
<P>This report is devoted to the synthesis of high quality nanorods using spin coating technique for seed layer growth. Effect of different parameter i.e., spins coating counts, spin coating speed, and the effect of temperature during the drying process was analyzed. Hot plate and furnace technique was used for heating purpose and the difference in the morphology was carefully observed. It is worthy to mention here that there is a substantial effect of all the above mentioned parameters on the growth and morphology of the ZnO nanostructure. The ZnO nanorods were finally synthesized using wet chemical method. The morphological properties of the obtained nanostructures were analyzed by using FESEM technique.</P>
Silicon space solar cells: progression and radiation-resistance analysis
Rehman, Atteq ur,Lee, Sang Hee,Lee, Soo Hong 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.4
<P>In this paper, an overview of the solar cell technology based on silicon for applications in space is presented. First, the space environment and its effects on the basis of satellite orbits, such as geostationary earth orbit (GEO) and low earth orbit (LEO), are described. The space solar cell technology based on silicon-based materials, including thin-film silicon solar cells, for use in space was appraised. The evolution of the design for silicon solar cell for use in space, such as a backsurface field (BSF), selective doping, and both-side passivation, etc., is illustrated. This paper also describes the nature of radiation-induced defects and the models proposed for understanding the output power degradation in silicon space solar cells. The phenomenon of an anomalous increase in the short-circuit current (I-sc) in the fluence irradiation range from 2 x 10(16) cm(-2) to 5 x 10(16) cm(-2) is also described explicitly from the view point of the various presented models.</P>
Rehman, Saeed Ur,Shaur, Ahmad,Song, Rak-Hyun,Lim, Tak-Hyoung,Hong, Jong-Eun,Park, Seok-Joo,Lee, Seung-Bok Elsevier 2019 Journal of Power Sources Vol.429 No.-
<P><B>Abstract</B></P> <P>The cost-effective fabrication of nanostructured cathodes for solid oxide fuel cells (SOFCs) that catalyze the oxygen reduction reaction effectively is a milestone to be achieved. Infiltration being the conventional method for the fabrication of nanostructured SOFC cathodes requires many infiltration and calcination cycles due to the low catalyst loading per infiltration cycle. Chemically assisted electrodeposition (CAED), a new means of fabricating nanostructured SOFC cathodes in a single loading step, provides the advantage of the simultaneous deposition of multiple cations while using dilute aqueous solutions of readily available salts. In this study, CAED is demonstrated by fabricating a cobalt-free LaNiO<SUB>3</SUB>/GDC composite cathode. The LaNiO<SUB>3</SUB>/GDC composite cathode prepared by CAED exhibits superior electrochemical properties compared to LaNiO<SUB>3</SUB>/GDC composite cathodes fabricated by sintering or self-assembly (a recently introduced low-temperature SOFC cathode fabrication method) approaches. An anode-supported SOFC with a LaNiO<SUB>3</SUB>/GDC composite cathode fabricated by CAED shows a high power density of 974 mW cm<SUP>−2</SUP> at an intermediate operating temperature of 750 °C. Low-temperature nano-fabrication by CAED, producing a cathode with a high surface area while avoiding the formation of insulating phases, is believed to play an important role in achieving better SOFC performance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> LaNiO<SUB>3</SUB> was successfully nanofabricated by chemically assisted electrodeposition. </LI> <LI> Chemically assisted electrodeposition enabled LaNiO<SUB>3</SUB> incorporation in a single step. </LI> <LI> LaNiO<SUB>3</SUB> showed a uniform morphology throughout the body of the cathode layer. </LI> <LI> Nanofabricated LaNiO<SUB>3</SUB> cathode showed a performance of 974 mWcm<SUP>−2</SUP> at 750 °C. </LI> <LI> Chemically assisted electrodeposition shows promise for SOFC electrode fabrication. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Rehman, Mohammad Mutee ur,Kim, Kwang Tae,Na, Kyoung Hoan,Choi, Kyung Hyun Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.422 No.-
<P><B>Abstract</B></P> <P>In this study, organic polymer poly-vinyl acetate (PVA) and inorganic aluminum oxide (Al<SUB>2</SUB>O<SUB>3</SUB>) have been used together to fabricate a hybrid barrier thin film for the protection of PET substrate. The organic thin films of PVA were developed through roll to roll electrohydrodynamic atomization (R2R-EHDA) whereas the inorganic thin films of Al<SUB>2</SUB>O<SUB>3</SUB> were grown by roll to roll spatial atmospheric atomic layer deposition (R2R-SAALD) for mass production. The use of these two technologies together to develop a multilayer hybrid organic-inorganic barrier thin films under atmospheric conditions is reported for the first time. These multilayer hybrid barrier thin films are fabricated on flexible PET substrate. Each layer of Al<SUB>2</SUB>O<SUB>3</SUB> and PVA in barrier thin film exhibited excellent morphological, chemical and optical properties. Extremely uniform and atomically thin films of Al<SUB>2</SUB>O<SUB>3</SUB> with average arithmetic roughness (Ra) of 1.64nm and 1.94nm respectively concealed the non-uniformity and irregularities in PVA thin films with Ra of 2.9nm and 3.6nm respectively. The optical transmittance of each layer was∼80-90% while the water vapor transmission rate (WVTR) of hybrid barrier was in the range of∼2.3×10<SUP>−2</SUP> gm<SUP>−2</SUP> day<SUP>−1</SUP> with a total film thickness of∼200nm. Development of such hybrid barrier thin films with mass production and low cost will allow various flexible electronic devices to operate in atmospheric conditions without degradation of their properties.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A hybrid organic-inorganic multilayer barrier thin film is reported for the protection of electronic devices. </LI> <LI> The organic thin films of PVA were developed by using roll to roll electrohydrodynamic atomization (R2R-EHDA). </LI> <LI> Inorganic thin film of Al<SUB>2</SUB>O<SUB>3</SUB> was deposited by using roll to roll spatial atmospheric atomic layer deposition (R2R-SAALD). </LI> <LI> Use of these two technologies together is very useful for the cost efficient and mass production of such protective layers. </LI> <LI> Uniform thin films of Al<SUB>2</SUB>O<SUB>3</SUB> reduced the roughness of PVA thin film while PVA elongated the delay time for water vapors. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>