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Kihyung Song Korean Chemical Society 1991 Bulletin of the Korean Chemical Society Vol.12 No.5
In this paper, the question whether the curvature of the minimum energy path can affect the dynamic threshold was tested using the boundary trajectory method developed by Chesnavich and coworkers. For nonreactive system, the MO EXP model potential surface was used with modified equilibrium distance to control the curvature. The results showed that there is no relation between the curvature and the dynamic threshold. In order to study the reactive system, a generalization of the boundary trajectory method was achieved to apply on the nonsymmetric system. We have found no correspondence between the curvature and the dynamic threshold of the system. It was also shown that the fate of the trajectories strongly depends on the shape of potential surface around the turning points along the symmetric stretch line.
Novel Organic Sensitizers with a Quinoline Unit for Efficient Dye-sensitized Solar Cells
Hyeju Choi,최현봉,백상현,Kihyung Song,강문성,고재중 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.1
Three organic sensitizers, JK-128, JK-129, and JK 130 containing quinoline unit are designed and synthesized.Under standard global AM 1.5 solar condition, the JK-130 sensitized solar cell gave a short circuit photocurrent density of 11.52 mA cm-2, an open circuit voltage of 0.70 V, and a fill factor of 0.75, corresponding to an overall conversion efficiency of 6.07%. We found that the η of JK-130 was higher than those of other two cells due to the higher photocurrent. The higher Jsc value is attributed to the broad and intense absorption spectrum of JK-130.
Paek, Sanghyun,Cho, Nara,Song, Kihyung,Jun, Moo-Jin,Lee, Jae Kwan,Ko, Jaejung American Chemical Society 2012 The Journal of Physical Chemistry Part C Vol.116 No.44
<P>The synthesis and photovoltaic characteristics of new organic semiconductors, <B>[bisDMFA-Th]-BT-HxTh</B><SUB><B>3</B></SUB> (<B>1</B>), <B>[bisDMFA-Th]-MonoF-BT-HxTh</B><SUB><B>3</B></SUB> (<B>2</B>), and <B>[bisDMFA-Th]-DiF-BT-HxTh</B><SUB><B>3</B></SUB> (<B>3</B>), are reported. These semiconductors have an unsymmetrical donor A–acceptor–donor B (D<SUB>A</SUB>-A-D<SUB>B</SUB>) framework composed of a benzothiadiazole (BT; fluorinated or unfluorinated) acceptor between two different donors, bisDMFA and terthiophene. We have demonstrated that these compounds are suitable for use in p-type organic semiconductors for high efficiency solution-processed small molecule organic solar cells (SMOSCs), for which we achieved a remarkable power conversion efficiency of 4.24% with a maximum <I>V</I><SUB>oc</SUB> of 0.89 V. The fluorine substitution on BT decreased its HOMO level and increased hole mobilities of <B>[bisDMFA-Th]-BT-HxTh</B><SUB><B>3</B></SUB> derivatives, leading to an increased <I>V</I><SUB>oc</SUB> in the SMOSCs and improved hole carrier transport properties of the material. In addition, we determined that the insertion of a TiO<SUB><I>x</I></SUB> functional layer into a bulk heterojunction (BHJ) solar cell significantly reduced the interfacial resistance between the photoactive film and metal electrode, resulting in an increased photocurrent with facile electron transfer between these two layers.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2012/jpccck.2012.116.issue-44/jp305989g/production/images/medium/jp-2012-05989g_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp305989g'>ACS Electronic Supporting Info</A></P>
Enhancing the Performance of Organic Dye-Sensitized Solar Cells via a Slight Structure Modification
Lim, Kimin,Kim, Chulwoo,Song, Juman,Yu, Taejung,Lim, Woocherl,Song, Kihyung,Wang, Peng,Zu, Ningning,Ko, Jaejung American Chemical Society 2011 The Journal of Physical Chemistry Part C Vol.115 No.45
<P>A novel organic sensitizer <B>JK-225</B> incorporating a planar indeno[1,2-<I>b</I>]thiophene bridging group was synthesized and compared to its prototype sensitizer <B>JK-2</B>. <B>JK-225</B> affords a short circuit photocurrent of 13.84 mA cm<SUP>–2</SUP>, an open circuit voltage of 790 mV, and a fill factor of 0.75, corresponding to an overall conversion efficiency of 8.2% under standard AM 1.5 sunlight, which is much higher than that of 6.9% in <B>JK-2</B>.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2011/jpccck.2011.115.issue-45/jp2070776/production/images/medium/jp-2011-070776_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp2070776'>ACS Electronic Supporting Info</A></P>
Choi, Hyeju,Han, Jinjoo,Kang, Moon-Sung,Song, Kihyung,Ko, Jaejung Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.5
We report on the influence of water as an electrolyte on the photovoltaic performances. The photovoltaic performance was shown to be quite sensitive to the substituent on the donor group. An optimized efficiency of 4.41% in the presence of 100% water content using $I^-/I{_3}^-$ redox couple was obtained using the D21L6 organic dye.
Cho, Nara,Paek, Sanghyun,Jeon, Jihye,Song, Kihyung,Sharma, G. D.,Ko, Jaejung The Royal Society of Chemistry 2014 Journal of Materials Chemistry A Vol.2 No.31
<P>Two symmetrical planar star-shaped organic small molecules,<I>i.e.</I>,DMM-TPA[DTS(FBTTh3)3] (1)andTPA[DTS(FBTTh3)3] (2), with fused TPA and TPA core donors, respectively, and three branched DTS(FBTTh3) units were synthesized and characterized. These small molecules were used donor materials along with a PC71BM acceptor for solution-processed bulk heterojunction solar cells. The power conversion efficiency (PCE) of the solar cells based on1and2is about 2.87% and 2.51%, respectively, when the active layers were processed from a CB solvent. The higher PCE of the solar cell based on1may be attributed to its low bandgap and broad absorption profile as compared to2. The PCE of the solution-processed SMBHJ solar cells was improved up to 5.16% and 4.70% for1and2, respectively, when the active layers were processed with 4 v% DIO as an additive in the CB solvent. The enhancement in the PCE was mainly due to the increase in<I>J</I>scand FF, which is attributed to the balanced charge transport between the electron and hole transport and reduction in the bimolecular recombination, leading to an increase in the PCE.</P>
Hyeju Choi,Jinjoo Han,강문성,Kihyung Song,고재중 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.5
We report on the influence of water as an electrolyte on the photovoltaic performances. The photovoltaic performance was shown to be quite sensitive to the substituent on the donor group. An optimized efficiency of 4.41% in the presence of 100% water content using I−/I3 − redox couple was obtained using the D21L6 organic dye.