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Ryu, Ka Yeon,Sung, Dan-Bi,Won, Suk-Young,Jo, Ara,Ahn, Kyusang,Kim, Hyun Yeong,ArulKashmir, Arulraj,Kwak, Kyungwon,Lee, Chongmok,Kim, Won-Suk,Kim, Kyungkon Elsevier 2018 Dyes and pigments Vol.149 No.-
<P><B>Abstract</B></P> <P>New small molecular semiconductors with small band gap and low-lying highest occupied molecular orbital (<I>E</I> <SUB>HOMO</SUB>), namely TBDPPOT, TBDPPEH, and TBDPPEHT4 were synthesized by incorporating the B←N bridged thienylthiazole and diketopyrrolopyrrole (DPP) derivatives. TBDPPOT and TBDPPEH were prepared, respectively, using two different DPPs having 1-octyl and 2-ethylhexyl moiety as the solubilizing group. In addition, the band gap of the TBDPPEH is further reduced by introducing planar thienothiophene unit, which was used for the preparation of TBDPPEHT4. These synthesized SMs are blended with fullerene derivative to construct a photo-active layer for organic photovoltaics. Among OPVs utilizing those SMs, the TBDPPEH exhibits highest power conversion efficiency of 3.21% with an exceptionally high <I>V</I> <SUB>OC</SUB> of 0.92 V, which is ascribed to low-lying HOMO energy level of −5.62 eV. It is expected that the utilization of TBDPPEH as a photo-active layer for OPVs would enhance the oxidation stability of the OPVs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Small molecular semiconductors with low-lying HOMO were synthesized. </LI> <LI> These molecules contain B←N bridged thienylthiazole and diketopyrrolopyrrole derivatives. </LI> <LI> Solar cell based on those molecules exhibited high <I>V</I> <SUB>OC</SUB> values. </LI> </UL> </P>
Seok, Jeesoo,Ryu, Ka Yeon,Lee, Jin Ah,Jeong, Inyoung,Lee, Nam-Suk,Baik, Jeong Min,Kim, Joo Gon,Ko, Min Jae,Kim, Kyungkon,Kim, Myung Hwa The Royal Society of Chemistry 2015 Physical chemistry chemical physics Vol.17 No.5
<P>We introduce a facile approach to use ruthenium dioxide (RuO<SUB>2</SUB>) and ruthenium (Ru) nanostructures as effective counter electrodes instead of using platinum (Pt) for dye-sensitized solar cells (DSSCs). RuO<SUB>2</SUB> and Ru nanostructure layers on the FTO glass can be readily prepared by a simple annealing process followed by the spin coating process of the mixture solution containing amorphous RuO<SUB>2</SUB>·<I>x</I>H<SUB>2</SUB>O precursor and poly(ethylene oxide) (PEO) as a dispersion matrix at low temperature in air. The Ru metal nanostructure layer prepared by the reduction of RuO<SUB>2</SUB> with H<SUB>2</SUB> shows the highest efficiency of 6.77% in DSSC operation, which is comparable to the efficiency of the Pt electrode (7.87%).</P> <P>Graphic Abstract</P><P>We introduce a facile approach to use ruthenium dioxide (RuO<SUB>2</SUB>) and ruthenium (Ru) nanostructures as effective counter electrodes instead of using platinum (Pt) for dye-sensitized solar cells (DSSCs). <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp04506h'> </P>
Song, Chang Eun,Ryu, Ka Yeon,Hong, Seong-Jin,Bathula, Chinna,Lee, Sang Kyu,Shin, Won Suk,Lee, Jong-Cheol,Choi, Si Kyung,Kim, Joo Hyun,Moon, Sang-Jin Wiley-VCH 2013 ChemSusChem Vol.6 No.8
<P>We report the superior characteristics of a ZnO buffer layer covered with a phenothiazine-based, π-conjugated donor-acceptor (D-π-A)-type organic dye (called 'd-ZnO'). The use of this system for the performance enhancement of inverted bulk heterojunction polymer solar cells (PSCs) with the configuration of indium tin oxide/d-ZnO/polymer:PC71 BM/MoO3 /Ag (PC71 BM=[6,6]-phenyl C71 butyric acid methyl ester) is investigated. The layer of organic dyes anchored on the ZnO surface through carboxylate bonding reduces the shunt path on bare ZnO surface and provides better interfacial contacts and energy level alignments between the ZnO layer and the photoactive layer. This phenomenon consequently leads to highly enhanced photovoltaic parameters (fill factor, open-circuit voltage, and short-circuit current density) and power conversion efficiencies (PCEs). Inverted solar cells containing the d-ZnO layer not only revealed about 34% (PCE: 4.37%) and 18% (PCE: 7.11%) improvement in the PCEs of the representative poly-3(hexylthiophene) (P3HT) and low-band-gap poly{[4,8-bis-(2-ethyl-hexyl-thiophene-5-yl)-benzo[1,2-b:4,5-b']dithiophene-2,6-diyl]-alt-[2-(2'-ethylhexanoyl)-thieno[3,4-b]thiophen-4,6-diyl]} (PBDTTT-C-T) polymer systems, respectively, but also showed 2-4 times longer device lifetimes than their counterparts without the organic dye layer. These results demonstrate that this simple approach used in inverted PSCs with a metal oxide buffer layer could become a promising procedure to fabricate highly efficient and stable PSCs.</P>
Park, Boyoung Y.,Ryu, Ka Yeon,Park, Jung Hwan,Lee, Sang-gi Royal Society of Chemistry 2009 GREEN CHEMISTRY Vol.11 No.7
<P>The catalytic activity of lanthanide triflates, particularly scandium triflate, increased dramatically in [bmim][SbF<SUB>6</SUB>], allowing the cyanosilylation of a variety of aldehydes and ketones with a turnover frequency up to 48 000 mol h<SUP>−1</SUP> and a total turnover number of 100 000.</P> <P>Graphic Abstract</P><P>Highly efficient Sc(OTf)<SUB>3</SUB>-catalyzed cyanosilylations of carbonyl compounds have been achieved in an ionic liquid. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b900254e'> </P>
Nguyen, Bich Phuong,Jung, Hye Ri,Ryu, Ka Yeon,Kim, Kyungkon,Jo, William American Chemical Society 2019 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.123 No.51
<P>Charge extraction at carrier transport layers adjacent to perovskites is crucial for the optimization of perovskite solar cells. In particular, Sn-perovskites with no lead elements are known to struggle from charge extraction. Here, we report the effects of organic ligands such as FA and MA (FA = HC(NH<SUB>2</SUB>)<SUB>2</SUB><SUP>+</SUP>; MA = CH<SUB>3</SUB>NH<SUB>3</SUB><SUP>+</SUP>) on charge separation at the interface between electron transport layers and perovskites. TiO<SUB>2</SUB> mesoporous covering the tin-perovskites show significant changes in the electronic structure and built-in potentials according to the ratio of FA to MA. Through a local probe with potential and current mapping, charge transport has been intensively examined. The best cell in this study is obtained as 5.37% at FA/MA = 3:1 with only iodine at the halide sites. Even though the value itself is not comparable with lead halides, it could pave a new direction to improve lead-free perovskite solar cells.</P> [FIG OMISSION]</BR>
Ternary Organic Photovoltaics Prepared by Sequential Deposition of Single Donor and Binary Acceptors
Cho, Yunju,Nguyen, Thanh Luan,Oh, Hyerim,Ryu, Ka Yeon,Woo, Han Young,Kim, Kyungkon American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.33
<P>Binary organic photovoltaics (OPVs) fabricated by single-step (SS) deposition of a binary blend of polymer (or small molecule) donor and fullerene acceptor (SS binary OPV) are widely utilized. To improve the OPV performance, SS ternary OPVs utilizing a ternary blend consisting of two (or one) electron donor(s) and one (or two) electron acceptor(s) have been studied. SS ternary OPVs require more sensitive and complex optimization processes to optimize bulk heterojunctions with bicontinuous nanoscale phase separation of the donor and acceptor. We demonstrated a novel ternary OPV fabricated by sequential (SQ) deposition of a single polymer donor and a binary mixture consisting of a phenyl-C<SUB>71</SUB>-butyric acid methyl ester (PCBM) and nonfullerene acceptor, 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-<I>d</I>:2,3′-<I>d</I>′]-<I>s</I>-indaceno[1,2-<I>b</I>:5,6-<I>b</I>′]dithiophene (ITIC). In the SQ ternary OPV, PCBM effectively created a bicontinuous pathway for charge transport with a polymer, and ITIC mainly enhanced light absorption and photovoltage. This complementary effect was not observed in an SS ternary OPV utilizing the same donor and acceptors. Due to these complementary effects, the SQ ternary OPV exhibited a power conversion efficiency of 6.22%, which was 52 and 37% higher than that of the SQ binary OPV and the SS ternary OPV, respectively. In addition, the thermal stability of the SQ ternary OPV was found to be superior to that of the SS ternary OPV.</P> [FIG OMISSION]</BR>
Fabrication of large area OPV cells
변원배(Byun, Won-Bae),신원석(Shin, Won Suk),류가연(Ryu, Ka Yeon),박혜성(Park, Hye Sung),문상진(Moon, Sang-Jin) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Recently, bulk hetero-junction cells have been extensively studied by many researchers. Most of these cells were fabricated by spin coater. However, the spin coating process is not favorable to the large-scaled industry because it is not compatible with roll-to-roll process. One of the alternative methods is Doctor blading. In this study, we fabricated large OPV cells having total area of 100cm². The buffer layer was Poly-(3,4-ethylenedioxythiophene) : poly-(styrenesulfonate) aqueous dispersion (PEDOT:PSS) and the active material is poly (3-hexythiophene) (P3HT) and phenyl-C61-butyric acid methyl ester (PCBM) blend in the solvent of Chlorobenzene. All of the organic layers were coated by dragging the blade with a speed of 5~20 mm/s on the stage with a temperature of 50?C. As-bladed PEDOT:PSS layer was baked at 120?C for 10 minutes to eliminate the water. The cell structure is patterned ITO substrate/PEDOT:PSS/P3HT:PCBM/LiF/Al. The topmost electrode, LiF/Al, was deposited by thermal evaporation. After depositing electrode, and the cell was annealed at 150?C for 30 minutes. The measured ISC, VOC, fill factor, and PCE were 2.95 A, 5.86 V, 0.32, and 0.78%, respectively. PCE was quite low but the large active area could be obtained successfully.