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Co-diffusion of boron and phosphorus for ultra-thin crystalline silicon solar cells
Choi, Jihye,Lee, Hyeonseung,Jung, Beomsic,Woo, Jeong-Hyun,Kim, Ju-Young,Lee, Kyu-Sung,Jeong, Jeung-hyun,Choi, Jea-Young,Kim, Won Mok,Lee, Wook Seong,Jeong, Doo Seok,Lee, Taek-Sung,Choi, Doo Jin,Kim, I IOP 2018 Journal of Physics. D, Applied Physics Vol.51 No.27
<P>This paper reports the fabrication of crystalline silicon passivated emitter rear totally diffused (c-Si PERT) solar cells with ultra-thin p-type wafers 50 <I>µ</I>m in thickness. Co-diffusion of boron and phosphorus in a single rapid thermal processing cycle, and an Al spin-on glass post-curing process were developed to remove the boron rich layer which is detrimental to c-Si solar cells. Co-diffusion was carried out with spin-on diffusion sources using boric acid and a P spin on dopant for simple and cost-effective emitter and back surface field (BSF) formation processes. The fabricated ultra-thin c-Si PERT cell featured an open circuit voltage (V<SUB>oc</SUB>) of 0.575 V, a short circuit current density (J<SUB>sc</SUB>) of 35.8 mA cm<SUP>−2</SUP>, a fill factor of 0.725, and a power conversion efficiency of 15.0%. The efficiency has improved by 2% compared with the standard structure cell with Al-BSF using thin evaporated Al 2 <I>µ</I>m in thickness. Along with cell output parameters, the flexural strength and critical bending radius were measured by a four point bending test, and the results showed that the solar cells with thinner rear Al electrodes are more applicable for a flexible solar cell device.</P>
Synthesis of Antineoplaston A10 Analogs as Potential Antitumor Agents
Choi, Bo-Gil,Kim, Ok-Young,Chung, Byung-Ho,Cho, Won-Jea,Cheon, Seung-Hoon,Choi, Sang-Un,Lee, Chong-Ock The Pharmaceutical Society of Korea 1998 Archives of Pharmacal Research Vol.21 No.2
Several aniline mustard analogues were obtained by introducing N,N-bis(2-chloroethyl)amino moiety to phenyl ring of A10 analogues in order to increase reactivity of A10 analogs and selectivity into DNA. The in vitro antitumor activity of synthesized compounds was evaluated using five different solid tumor cell lines by SRB method. Aniline mustard analogues exhibited more potent antitumor activity than A10 analogs. Especially, m-aniline mustard of benzoyl analogue displayed remarkable antitumor activity.
Highly Ordered Poly(3-hexylthiophene) Rod Polymers via Block Copolymer Self-Assembly
Choi, Su Yeon,Lee, Jea Uk,Lee, Jin Wook,Lee, Sle,Song, Yun Jeong,Jo, Won Ho,Kim, Seung Hyun American Chemical Society 2011 Macromolecules Vol.44 No.7
<P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2011/mamobx.2011.44.issue-7/ma102424e/production/images/medium/ma-2010-02424e_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ma102424e'>ACS Electronic Supporting Info</A></P>
Synthesis of Antineoplaston A10 Analogs as Potential Antitumor Agents
Choi, Bo Gil,Kim, Ok Young,Chung, Byung Ho,Cho, Won Jea,Cheon, Seung Hoon,Choi, Sang Un,Lee, Chong Ock 전남대학교 약품개발연구소 1998 약품개발연구지 Vol.7 No.1
Several aniline mustard analogues were obtained by introducing N,N-bis(2-chloroethyl)amino moiety to phenyl ring of A10 analogues in order to increase reactivity of A10 analogs and selectivity into DNA. The in vitro antitumor activity of synthesized compounds was evaluated using five different solid tumor cell lines by SRB method. Aniline mustard analogues exhibited more potent antitumor activity than A10 analogs. Especially, m-aniline mustard of benzoyl analogue displayed remarkable antitumor activity.
Choi, Seong-Woo,Won, Jong Woo,Lee, Sangwon,Hong, Jea Keun,Choi, Yoon Suk Elsevier 2018 Materials science & engineering. properties, micro Vol.738 No.-
<P><B>Abstract</B></P> <P>We compared deformation twinning activity and twin structure development of pure Ti at cryogenic temperature and room temperature by conducting unidirectional rolling at 77 K and 293 K. Twinning activity was significantly higher in rolling at 77 K than in rolling at 293 K. This was because lowering the deformation temperature increased the necessity for twinning operation to compensate for reduced accommodation of strain along the <I>c</I>-axis of the crystal structure, caused by inhibition of <<I>c</I>+<I>a</I>> slips. Twin structure was also entirely different between the two rolling temperatures. Compared to the case of rolling at 293 K, rolling at 77 K generated thin and numerous individual twins in the twinned grains, thereby giving rise to the development of a totally different twin structure. The differences in twin structure were caused by the combined effect of significant local stress concentration at grain boundaries and a reduction in stacking fault energy by rolling at 77 K. The twin structure strongly contributed to severe twinning-induced grain refinement that occurs at cryogenic temperature.</P>
Choi, Jin-Myung,Cho, Young-Chang,Cho, Won-Jea,Kim, Tae-Sung,Kang, Bok-Yun 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.3
Exposure to cigarette smoke is known to suppress immune responses and to increase the incidence and severity of respiratory infections. In this study, we determined the effect of hydroquinone (HQ), which is found at high concentrations in cigarette smoke, on interferon-gamma ($IFN-{\gamma}$) production by lymphocytes. HQ significantly inhibited $IFN-{\gamma}$ secretion by keyhole limpet hemocyanin-primed lymphocytes in a dose-dependent manner. In addition, HQ inhibited $IFN-{\gamma}$ secretion in effector $CD4^+$ T cells and Th1-differentiated $CD4^+$ T cells. The mRNA expression of $IFN-{\gamma}$ and the $IFN-{\gamma}$ gene promoter activity were inhibited by HQ. These results suggest that the inhibitory effect of HQ on $IFN-{\gamma}$ secretion may occur at the transcriptional level. Furthermore, the effects of HQ on transcription factors were investigated. HQ inhibited the transcriptional activity of activator protein-1 and nuclear $factor-{\kappa}B$, which are known to be involved in $IFN-{\gamma}$ transcriptional activation. These findings provide evidence that HQ might suppress immune responses by reducing the production of $IFN-{\gamma}$ and may explain the susceptibility to microbial infections caused by cigarette smoking.