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Lim, Jongchul,Kim, Taewan,Park, Taiho The Royal Society of Chemistry 2014 ENERGY AND ENVIRONMENTAL SCIENCE Vol.7 No.12
<P>We report a novel way to accelerate the rate of oxidized sensitizer neutralization on nanocrystalline TiO<SUB>2</SUB> electrode surfaces using a novel coadsorbent, 3,4,5-tris-butenyloxy benzoic acid (<B>TD</B>), having three terminal double bonds. <SUP>1</SUP>H NMR and contact angle measurements revealed that the terminal double bonds reacted with I<SUB>2</SUB> to form an <I>in situ</I>-generated ionic layer of I<SUP>−</SUP> species. Transient absorption spectroscopy (TAS) and electrochemical impedance spectroscopy (EIS) studies demonstrated that I<SUP>−</SUP> species neighbouring the cationic dye molecules (D<SUP>+</SUP>) accelerate the neutralization (or regeneration) rate (<I>k</I><SUB>D<SUP>+</SUP></SUB>), as well as decrease the recombination reactions of photoinduced electrons with D<SUP>+</SUP> (<I>k</I><SUB>1</SUB>) and I<SUB>3</SUB><SUP>−</SUP> (<I>k</I><SUB>2</SUB>). Dye-sensitized solar cells treated with <B>TD</B> exhibit a power conversion efficiency of 10.2%, which is 22% higher due to the simultaneous improvements in <I>J</I><SUB>SC</SUB> and <I>V</I><SUB>OC</SUB>, even at 15% low dye loading levels, compared to the values obtained from a conventional device.</P> <P>Graphic Abstract</P><P>A novel coadsorbent including three terminal double bonds reacted with I<SUB>2</SUB> and generated ionic complexes on the surface of TiO<SUB>2</SUB>. The <I>in situ</I>-generated ionic layer accelerated the neutralization rate of dye<SUP>+</SUP> and decreased the recombination reactions with dye<SUP>+</SUP> and I<SUB>3</SUB><SUP>−</SUP> due to coadsorbent effects, resulting in 22% higher power conversion efficiency, even at 15% low dye loading, compared to the conventional device. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4ee01950d'> </P>
Effect of coadsorbent properties on the photovoltaic performance of dye-sensitized solar cells
Lim, Jongchul,Kwon, Young Soo,Park, Taiho Royal Society of Chemistry 2011 Chemical communications Vol.47 No.14
<P>Stearic acid as a coadsorbent, which has a low dipole moment and high solubility, retarded the rate of dye adsorption during the competitive anchoring process on the TiO<SUB>2</SUB> layer in dye-sensitized solar cells (DSCs), thereby increasing the content of strongly bound dye on the TiO<SUB>2</SUB> surface. This resulted in an approximately 25% improvement in both <I>J</I><SUB>SC</SUB> and the power conversion efficiency of the DSCs, even for much lower dye coverage.</P> <P>Graphic Abstract</P><P>The competitive anchoring of dye and coadsorbent in DSCs induced retardation of the rate of dye adsorptions, increasing the content of strongly bound dye on the TiO<SUB>2</SUB> surface resulted in improvement of <I>J</I><SUB>SC</SUB>, even for much lower dye coverages. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cc04999a'> </P>
Lim, Jongchul,Kwon, Young Soo,Park, Sung-Hae,Song, In Young,Choi, Jongmin,Park, Taiho American Chemical Society 2011 Langmuir Vol.27 No.23
<P>TiO<SUB>2</SUB> electrodes, sensitized with the N719 dye at high immersion temperatures during the sensitization process, were found to have large fractions of weakly bound N719 on the electrode surface, which resulted in dye aggregation and decreased device longevity. These disadvantages were ameliorated using a low-temperature stearic acid (SA)-assisted anchoring method described here. The activation energy (Δ<I>E</I><SUB>NS</SUB><SUP>⧧</SUP>) and relative fraction of strongly bound N719 were twice as large as the respective values obtained without the use of SA. Slowing of adsorption, both by thermal means and through SA-mediated processes, effectively controlled the binding mode of N719 on the surface of TiO<SUB>2</SUB>. The resulting sensitized electrodes displayed enhanced device longevity and improved generation of photoinduced electrons.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2011/langd5.2011.27.issue-23/la2026329/production/images/medium/la-2011-026329_0012.gif'></P>