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Lateral assembly of millimetre-long silicon nanowires for multiple device integration
Yong Bum Pyun,Dong Hyun Lee,이재석,장재일,Yong-Jae Kim,박원일 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.4
Ultralong one-dimensional nanostructures can serve as unique building blocks that interlink nanometre-scale materials with those in the real macroscopic world. Here we report on the lateral assembly of millimetre-long silicon (Si) nanowires (MMLSiNWs) synthesized through a metal-catalyzed vapor-liquid-liquid method by a soft-contact-printing (SCP) process. In our approach, the pressure and shear force between NWs and the substrate surface were systematically varied by the gliding angle and weight of the receiver substrate, which can assemble MML-SiNWs into parallel arrays with a controlled density. These MML-SiNW building blocks have been configured as multiple device arrays by wiring hundreds of electrodes onto a single wire by conventional photolithography. Transport measurements demonstrated uniform electrical properties along the millimetre-length of the SiNWs with a high-channel conductance of ~5 μS. Ultralong one-dimensional nanostructures can serve as unique building blocks that interlink nanometre-scale materials with those in the real macroscopic world. Here we report on the lateral assembly of millimetre-long silicon (Si) nanowires (MMLSiNWs) synthesized through a metal-catalyzed vapor-liquid-liquid method by a soft-contact-printing (SCP) process. In our approach, the pressure and shear force between NWs and the substrate surface were systematically varied by the gliding angle and weight of the receiver substrate, which can assemble MML-SiNWs into parallel arrays with a controlled density. These MML-SiNW building blocks have been configured as multiple device arrays by wiring hundreds of electrodes onto a single wire by conventional photolithography. Transport measurements demonstrated uniform electrical properties along the millimetre-length of the SiNWs with a high-channel conductance of ~5 μS.
Pyun, Yong Bum,Yi, Jaeseok,Lee, Dong Hyun,Son, Kwang Soo,Liu, Guanchen,Yi, Dong Kee,Paik, Ungyu,Park, Won Il Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.24
<P>We present a new synthetic approach, <I>via</I> hydrothermal process with the use of polystyrene (PS) colloids, to fabricate vertically aligned, single crystalline ZnO nanotube arrays. Electron microscopy images revealed that single crystalline nanotubes with inner diameters of ∼15–20 nm and wall thicknesses of ∼10–15 nm were formed just below the PS colloids, whereas solid nanorods were grown in the absence of PS colloids. In addition, nanorods enclosing the PS colloids exhibited much faster growth rates than those on the area not covered with PS colloids. These results indicate that the introduction of PS colloids affected the formation and diffusion of adatoms. The growth behavior of ZnO crystals with regards to the PS colloids was exploited to convert the ZnO nanostructures from solid to nanotube-nanorod hybrid networks by introducing hexagonally close-packed PS colloidal monolayers. Moreover, we demonstrated further conversion to complete tubular forms by reducing the aperture size between adjacent PS colloids with thermal annealing.</P> <P>Graphic Abstract</P><P>A new synthesis route to fabricate vertically aligned ZnO nanotubes and nanotube-nanorod hybrid structures <I>via</I> wet hydrothermal processes with the use of polystyrene colloids deposited on ZnO seed layers is demonstrated. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm00011f'> </P>
Dong Hyun Lee,Yong Bum Pyun,Kwang-Soo Son,Jae-Woong Choung,이정민,Seong Jun Son,박원일 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.1
We report the patterned synthesis of silicon nanowire (SiNW) arrays by controlling the density and position of Au colloids on glass substrates in a nanocolloid-catalyzed chemical vapor deposition (CVD) process. Density-controlled colloidal Au patterns were defined on the substrates by an inverse contact imprinting technique, where the strong attractive force between electrolyte-coated polymer stamp surfaces and Au colloids was exploited for selective removal of Au colloids from contacting regions of the substrate to the stamp. Controlled nanocolloid-catalyzed CVD process led to the growth of SiNWs being rooted in the catalytic patterns and extended over several tens of μm. In addition, optical transmittance of the SiNW pattern arrays depending on the NW density and the coverage of catalytic patterns were investigated to understand the optical properties of SiNW arrays.
Chemical Effects of Tin Oxide Nanoparticles in Polymer Electrolytes-Based Dye-Sensitized Solar Cells
Chae, Hwaseok,Song, Donghoon,Lee, Yong-Gun,Son, Taewook,Cho, Woohyung,Pyun, Yong Bum,Kim, Tea-Yon,Lee, Jung Hyun,Fabregat-Santiago, Francisco,Bisquert, Juan,Kang, Yong Soo American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.30
<P>The effects on the photovoltaic performance of the incorporation of SnO<SUB>2</SUB> nanoparticles into the polymer of a solid-state dye-sensitized solar cell (DSC) based on the poly(ethylene oxide)/poly(ethylene glycol) dimethyl ether solid electrolyte are studied in this paper. It has been found that the addition of SnO<SUB>2</SUB> nanoparticles to the solid electrolyte produces several key changes in the properties of the solid-state DSC that produced a better performance of the device. Therefore, we have measured an improvement in electrolyte conductivity by a factor of 2, a linear rise in the TiO<SUB>2</SUB> conduction band position, a reduction in the electron recombination rate, and a decrease in charge-transfer resistance at the counterlectrode/electrolyte interface. All these improvements produced an increase in the power conversion efficiency from 4.5 to 5.3% at 1 sun condition, a consequence of the increase of both <I>V</I><SUB>oc</SUB> (oc = open circuit) and <I>J</I><SUB>sc</SUB> (sc = short circuit) without any sacrifice in FF (fill factor)<I>.</I> The origin of these changes has been associated to the strong Lewis acidic character of SnO<SUB>2</SUB> nanoparticles yielding to the formation of a I<SUB>3</SUB><SUP>–</SUP> percolation layer for holes at the surface of SnO<SUB>2</SUB> and the reduction of the concentration of free I<SUB>3</SUB><SUP>–</SUP> and K<SUP>+</SUP> ions inside the pores of TiO<SUB>2</SUB>. From these results, it is concluded that the physicochemical effects of inorganic nanofiller in the polymer electrolyte may also be considered a good route in designing the high efficiency solid-state DSCs employing the polymer electrolyte.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-30/jp4117485/production/images/medium/jp-2013-117485_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp4117485'>ACS Electronic Supporting Info</A></P>