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Cho, Seongeun,Kim, Youngjun,Kim, Minkyoing,Kim, Jin-A.,Kim, Kihyun,Park, Yujin,Han, Soojin,Han, Chang-Yeol,Kim, Jong-Hoon,Hwang, Jun Yeon,Park, Jun-Young,Kim, Eugene,Yang, Heesun,Park, Byoungnam Elsevier 2017 Solar energy materials and solar cells Vol.164 No.-
<P><B>Abstract</B></P> <P>We demonstrate that, through formation of Zn<SUB>1−x</SUB>Mg<SUB>x</SUB>O nanocrystal solid solution (NCSS) coupled with lead sulfide (PbS) nanocrystal (NC) of different size, optoelectronic properties of a donor-acceptor energy harvesting assembly can be probed and tuned. In the ITO/PEDOT:PSS/PbS/Zn<SUB>1−x</SUB>Mg<SUB>x</SUB>O/Al arrangement as a photovoltaic test probe, simultaneous tuning of Zn<SUB>1−x</SUB>Mg<SUB>x</SUB>O NC solid solution (NCSS) and PbS NC in a narrow range in the energy levels is achieved altering the open circuit voltage and the short circuit current as measures of donor/acceptor interfacial electronic properties. With the Mg composition increasing, the energy band gap of the Zn<SUB>1−x</SUB>Mg<SUB>x</SUB>O NCSS (acceptor) increases with its conduction band edge becoming closer to the lowest occupied molecular orbital level of the PbS NC (donor), increasing splitting of quasi-Fermi energy levels in the electron donor/acceptor assembly under illumination. More amount of Mg in the NCSS leads to transition from an energy level limited regime to a trap-induced charge transport limited regime, evidenced by a simultaneous decrease in the open circuit voltage and the short circuit current. This new finding provides insights of trade-off between the energy level off-set and the trap-induced charge transport degradation in engineering interfacial charge transfer and transport via formation of NCSS in integrating modern electronic devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Simultaneous tuning of Zn<SUB>1−x</SUB>Mg<SUB>x</SUB>O NCSS and PbS NC in a narrow range is achieved. </LI> <LI> Formation of NCSS at a very narrow range has a dramatic effect on the interfacial properties. </LI> <LI> Subtle amount of doping in the NCSS leads to transition from an energy level limited to a transport limited regime. </LI> </UL> </P>
DigSee: disease gene search engine with evidence sentences (version cancer)
Kim, Jeongkyun,So, Seongeun,Lee, Hee-Jin,Park, Jong C.,Kim, Jung-jae,Lee, Hyunju Oxford University Press 2013 Nucleic acids research Vol.41 No.w1
<P>Biological events such as gene expression, regulation, phosphorylation, localization and protein catabolism play important roles in the development of diseases. Understanding the association between diseases and genes can be enhanced with the identification of involved biological events in this association. Although biological knowledge has been accumulated in several databases and can be accessed through the Web, there is no specialized Web tool yet allowing for a query into the relationship among diseases, genes and biological events. For this task, we developed DigSee to search MEDLINE abstracts for evidence sentences describing that ‘genes’ are involved in the development of ‘cancer’ through ‘biological events’. DigSee is available through http://gcancer.org/digsee.</P>