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Electrical, electronic and optical properties of amorphous indium zinc tin oxide thin films
Denny, Y.R.,Lee, K.,Seo, S.,Oh, S.K.,Kang, H.J.,Yang, D.S.,Heo, S.,Chung, J.G.,Lee, J.C. New York] ; North-Holland 2014 APPLIED SURFACE SCIENCE - Vol.315 No.-
The electrical and optical properties of amorphous indium zinc tin oxide (a-IZTO) thin films were examined as a function of chemical composition. Effects of Sn/Zn composition ratio and In content on the electrical and optical properties of a-IZTO thin films are discussed. The electron mobility of thin film transistors with higher Sn/Zn composition ratio was dramatically improved due to a shorter zinc-zinc separation distance. The thin film transistor with the composition of In:Zn:Sn=20:48:32 exhibits a high mobility of 30.6cm<SUP>2</SUP>V<SUP>-1</SUP>s<SUP>-1</SUP> and a high on-off current ratio of 10<SUP>9</SUP>.
Lee, Dennis T.,Chung, Jong Won,Park, Geonhee,Kim, Yun-Tae,Lee, Chang Young,Cho, Yeonchoo,Yoo, Pil J.,Han, Jae-Hee,Shin, Hyeon-Jin,Kim, Woo-Jae Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.429 No.-
<P><B>Abstract</B></P> <P>Semiconducting single-walled carbon nanotubes (SWNTs) show promise as core materials for next-generation solar cells and nanoelectronic devices. However, most commercial SWNT production methods generate mixtures of metallic SWNTs (m-SWNTs) and semiconducting SWNT (sc-SWNTs). Therefore, sc-SWNTs must be separated from their original mixtures before use. In this study, we investigated a polymer-based, noncovalent sc-SWNT separation approach, which is simple to perform and does not disrupt the electrical properties of the SWNTs, thus improving the performance of the corresponding sc-SWNT-based applications. By systematically investigating the effect that different structural features of the semiconductor polymer have on the separation of sc-SWNTs, we discovered that the length and configuration of the alkyl side chains and the rigidity of the backbone structure exert significant effects on the efficiency of sc-SWNT separation. We also found that electron transfer between the semiconductor polymers and sc-SWNTs is strongly affected by their energy-level alignment, which can be tailored by controlling the donor-acceptor configuration in the polymer backbone structures. Among the polymers investigated, the highly planar P8T2Z-C12 semiconductor polymer showed the best sc-SWNT separation efficiency and unprecedentedly strong electronic interaction with the sc-SWNTs, which is important for improving their performance in applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The effect of polymers’ structural features on the separation of sc-SWNTs is explored. </LI> <LI> Polymer’s alkyl side-chain length and orientation are keys in sc-SWNT separation. </LI> <LI> The rigidity of the backbone structure is key factor in efficient separation of sc-SWNTs. </LI> <LI> Energy level alignment of polymer and sc-SWNTs is important for device performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Current Trends in Pediatric Minimally Invasive Urologic Surgery
Dennis J. Lee,Philip H. Kim,Chester J. Koh 대한비뇨의학회 2010 Investigative and Clinical Urology Vol.51 No.2
Over the past two decades, laparoscopic and robotic surgery in children has been described as a viable minimally invasive alternative to open surgery for many pediatric urologic conditions. With the goal of reducing the morbidity associated with open surgery, minimally invasive surgery in children is increasingly being performed as laparoscopic and robotic patients appear to be experiencing shorter hospital stays, decreased pain medication requirements, and the potential for improved cosmesis. This article provides an overview of the existing literature in laparoscopic and robotic-assisted laparoscopic urologic surgery in children. Laparoscopic and robotic-assisted laparoscopic surgery appears to be safe and effective in children for a wide range of ablative and reconstructive procedures. Conventional laparoscopic surgery is effective for ablative procedures, while robotic surgery may be ideally suited for reconstructive cases requiring advanced suturing and dissection. Overall, more prospective studies are needed to study the long-term outcomes of minimally invasive surgery in pediatric patients, and the appropriate use of the available technology.
Leigh, D.F.,Owen, J.H.G.,Lee, S.M.,Porfyrakis, K.,Ardavan, A.,Dennis, T.J.S.,Pettifor, D.G.,Briggs, G.A.D. Elsevier 2005 Chemical physics letters Vol.414 No.4
<P><B>Abstract</B></P><P>Two different structural isomers of Nd@C<SUB>82</SUB> have been isolated using two-stage high-performance liquid chromatography. Their molecular orbital structures have been studied by a combination of scanning tunneling microscopy (STM) and density functional theory (DFT). Matching filled and empty-states STM images to DFT calculations allowed us to distinguish directly between the two isomers on the surface.</P>
Hyperfine structure of Sc@C<sub>82</sub> from ESR and DFT
Morley, G W,Herbert, B J,Lee, S M,Porfyrakis, K,Dennis, T J S,Nguyen-Manh, D,Scipioni, R,van Tol, J,Horsfield, A P,Ardavan, A,Pettifor, D G,Green, J C,Briggs, G A D IOP Pub 2005 Nanotechnology Vol.16 No.11
<P>The electron spin <I>g</I>-?and hyperfine tensors of the endohedral metallofullerene Sc@C<SUB>82</SUB> are anisotropic. Using electron spin resonance (ESR) and density functional theory (DFT), we can relate their principal axes to the coordinate frame of the molecule, finding that the <I>g</I>-tensor is not axially symmetric. The Sc bond with the cage is partly covalent and partly ionic. Most of the electron spin density is distributed around the carbon cage, but 5% is associated with the scandium d<SUB><I>yz</I></SUB> orbital, and this drives the observed anisotropy. </P>