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Mosconi, Edoardo,Yum, Jun-Ho,Kessler, Florian,Gó,mez Garcí,a, Carlos J.,Zuccaccia, Cristiano,Cinti, Antonio,Nazeeruddin, Mohammad K.,Grä,tzel, Michael,De Angelis, Filippo American Chemical Society 2012 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.134 No.47
<P>We report a combined experimental and computational investigation to understand the nature of the interactions between cobalt redox mediators and TiO<SUB>2</SUB> surfaces sensitized by ruthenium and organic dyes, and their impact on the performance of the corresponding dye-sensitized solar cells (DSSCs). We focus on different ruthenium dyes and fully organic dyes, to understand the dramatic loss of efficiency observed for the prototype Ru(II) N719 dye in conjunction with cobalt electrolytes. Both N719- and Z907-based DSSCs showed an increased lifetime in iodine-based electrolyte compared to the cobalt-based redox shuttle, while the organic D21L6 and D25L6 dyes, endowed with long alkoxy chains, show no significant change in the electron lifetime regardless of employed electrolyte and deliver a high photovoltaic efficiency of 6.5% with a cobalt electrolyte. Ab initio molecular dynamics simulations show the formation of a complex between the cobalt electrolyte and the surface-adsorbed ruthenium dye, which brings the [Co(bpy)<SUB>3</SUB>]<SUP>3+</SUP> species into contact with the TiO<SUB>2</SUB> surface. This translates into a high probability of intercepting TiO<SUB>2</SUB>-injected electrons by the oxidized [Co(bpy)<SUB>3</SUB>]<SUP>3+</SUP> species, lying close to the N719-sensitized TiO<SUB>2</SUB> surface. Investigation of the dye regeneration mechanism by the cobalt electrolyte in the Marcus theory framework led to substantially different reorganization energies for the high-spin (HS) and low-spin (LS) reaction pathways. Our calculated reorganization energies for the LS pathways are in excellent agreement with recent data for a series of cobalt complexes, lending support to the proposed regeneration pathway. Finally, we systematically investigate a series of Co(II)/Co(III) complexes to gauge the impact of ligand substitution and of metal coordination (tris-bidentate vs bis-tridentate) on the HS/LS energy difference and reorganization energies. Our results allow us to trace structure/property relations required for further development of cobalt electrolytes for DSSCs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2012/jacsat.2012.134.issue-47/ja3079016/production/images/medium/ja-2012-079016_0016.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja3079016'>ACS Electronic Supporting Info</A></P>
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Hae-Yoon Jung,Tae-Ho Lee,Ohyung Kwon,Hee-Woon Cheong,Steinmuller, Sven Ole,Janek, Jü,rgen,Ki-Woong Whang IEEE 2010 IEEE electron device letters Vol.31 No.7
<P>We have applied a double protecting layer consisting of SrO and MgO to a plasma display panel. The top MgO layer protects the underlying SrO from contamination by H<SUB>2</SUB>O or CO<SUB>2</SUB> when exposed to air and enables it to function as the main cathode material after the aging process, which partially removes the MgO layer. We have confirmed that the adoption of a double SrO-MgO layer results in a considerable reduction in driving voltage and improvement in luminous efficacy simultaneously.</P>
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Kim, Dongyoung,Hwang, Hui-Yun,Kim, Jin Young,Lee, Ju Yeon,Yoo, Jong Shin,Marko-Varga, Gyö,rgy,Kwon, Ho Jeong American Chemical Society 2017 JOURNAL OF PROTEOME RESEARCH Vol.16 No.1
<P>The drug FK506 (tacrolimus, fujimycin) exerts its immunosuppressive effects by regulating the nuclear factor of the activated T-cell (NFAT) family of transcription factors. However, FK506 also exhibits neuroprotective effects, but its direct target proteins that mediate these effects have not been determined. To identify the target proteins responsible for FK506's neuroprotective effects, the drug affinity responsive target stability (DARTS) method was performed using label free FK506, and LC-MS/MS analysis of the FK506-treated proteome was also performed. Using DARTS and LC-MS/MS analyses in combination with reference studied, V-ATPase catalytic subunit A (ATP6V1A) was identified as a new target protein of FK506. The biological relevance of ATP6V1A in mediating the neuroprotective effects of FK506 was validated by analyzing FK506 activity with respect to autophagy via acridine orange staining and transcription factor EB (TFEB) translocation assay. These analyses demonstrated that the binding of FK506 with ATP6V1A induces autophagy by activating the translocation of TFEB from the cytosol into the nucleus. Because autophagy has been identified as a mechanism for treating neurodegenerative diseases and because we have demonstrated that FK506 induces autophagy, this study demonstrates that'FK.506 is a possible new therapy for treating, neurodegenerative diseases.</P>
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Schnauber, Peter,Schall, Johannes,Bounouar, Samir,Hö,hne, Theresa,Park, Suk-In,Ryu, Geun-Hwan,Heindel, Tobias,Burger, Sven,Song, Jin-Dong,Rodt, Sven,Reitzenstein, Stephan American Chemical Society 2018 NANO LETTERS Vol.18 No.4
<P>The development of multinode quantum optical circuits has attracted great attention in recent years. In particular, interfacing quantum-light sources, gates, and detectors on a single chip is highly desirable for the realization of large networks. In this context, fabrication techniques that enable the deterministic integration of preselected quantum-light emitters into nanophotonic elements play a key role when moving forward to circuits containing multiple emitters. Here, we present the deterministic integration of an InAs quantum dot into a 50/50 multimode interference beamsplitter via in situ electron beam lithography. We demonstrate the combined emitter-gate interface functionality by measuring triggered single-photon emission on-chip with <I>g</I><SUP>(2)</SUP>(0) = 0.13 ± 0.02. Due to its high patterning resolution as well as spectral and spatial control, in situ electron beam lithography allows for integration of preselected quantum emitters into complex photonic systems. Being a scalable single-step approach, it paves the way toward multinode, fully integrated quantum photonic chips.</P> [FIG OMISSION]</BR>
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Ultrathin Organic Solar Cells with Graphene Doped by Ferroelectric Polarization
Kim, Keumok,Bae, Sang-Hoon,Toh, Chee Tat,Kim, Hobeom,Cho, Jeong Ho,Whang, Dongmok,Lee, Tae-Woo,Ö,zyilmaz, Barbaros,Ahn, Jong-Hyun American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.5
<P>Graphene has been employed as transparent electrodes in organic solar cells (OSCs) because of its good physical and optical properties. However, the electrical conductivity of graphene films synthesized by chemical vapor deposition (CVD) is still inferior to that of conventional indium tin oxide (ITO) electrodes of comparable transparency, resulting in a lower performance of OSCs. Here, we report an effective method to improve the performance and long-term stability of graphene-based OSCs using electrostatically doped graphene films via a ferroelectric polymer. The sheet resistance of electrostatically doped few layer graphene films was reduced to ∼70 Ω/sq at 87% optical transmittance. Such graphene-based OSCs exhibit an efficiency of 2.07% with a superior stability when compared to chemically doped graphene-based OSCs. Furthermore, OSCs constructed on ultrathin ferroelectric film as a substrate of only a few micrometers show extremely good mechanical flexibility and durability and can be rolled up into a cylinder with 7 mm diameter.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-5/am405270y/production/images/medium/am-2013-05270y_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am405270y'>ACS Electronic Supporting Info</A></P>
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