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Sim, Jae-Kwan,Um, Dae-Young,Kim, Jong-Woong,Kim, Jin-Soo,Jeong, Kwang-Un,Lee, Cheul-Ro Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.779 No.-
<P><B>Abstract</B></P> <P>Cu(In, Ga) Se<SUB>2</SUB> (CIGS) thin-film solar cells are currently the fastest growing photovoltaic technology due to the higher performance ratio and lower energy payback time compared to the silicon, and good stability. Despite of these interesting properties, CIGS solar cells suffer from poor spectral response at short wavelengths particularly in the range of 300–400 nm. In the present work, we have introduced GaN nanowires in CIGS solar cells in order to improve the performance of photovoltaic device in the short wavelength region (300–400 nm). To evaluate the influence of GaN nanowires, the morphological, structural and electrical properties have been studied. These studies have shown the introduction of GaN nanowires not only improve the cell efficiency but also enhance the spectral response in the wavelength range 300–400 nm. The CIGS solar cells fabricated with GaN nanowires displayed power conversion efficiency of 10.15% with a fill factor of 65%, which are substantially higher than that of reference cell (without GaN nanowires).</P> <P><B>Highlights</B></P> <P> <UL> <LI> GaN nanowires have been incorporated in the CIGS solar cells. </LI> <LI> Introduction of GaN nanowires results in an improvement in the performance of CIGS solar cells. </LI> <LI> The CIGS solar cells with GaN nanowires displayed higher cell efficiency than a reference cell. </LI> <LI> Improved cell efficiency originated from boosted spectral response in the wavelength range 300–400 nm. </LI> </UL> </P>
Kang, Suk Woo,Kim, Chul Young,Song, Dae-geun,Pan, Cheol-Ho,Cha, Kwang Hyun,Lee, Dong-Un,Um, Byung-Hun John Wiley Sons, Ltd. 2010 Phytochemical analysis Vol.21 No.4
<P>Introduction – Angelica dahurica (Fisch. Ex hoffm.) Benth. Et Hook. is a perennial herb that grows throughout Korea whose dried roots have been used to treat various diseases in Korean traditional medicine. The root extract contains diverse constituents, and it is necessary to determine the active compounds.</P><P>Objective – To investigate the nitric oxide (NO) inhibitory activity in a root extract of A. dahurica and identify the most active compounds using LC-NMR-MS.</P><P>Methodology – In search of the anti-inflammatory constituents of A. dahurica extract, the HPLC-based activity profiling approach was used to investigate the extract's NO inhibitory activity. To directly identify the compounds, a hyphenated LC-NMR-MS technique was applied. Reversed-phase isocratic chromatography was performed using the acetonitrile–water solvent system on a C<SUB>30</SUB> column. The identification of the compounds was based on information from ESI/MS and <SUP>1</SUP>H-NMR.</P><P>Results – NO inhibitory activities for five main fractions of the extract were evaluated, which were identified by LC-NMR-MS as containing furanocoumarins: byakangelicol, oxypeucedanin, imperatorin, phellopterin and isoimperatorin.</P><P>Conclusion – The results obtained showed that the anti-inflammatory activities of A. dahurica could be linked to imperatorin and phellopterin. Copyright © 2010 John Wiley & Sons, Ltd.</P>