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SEIGO ITO,TAKUROU N. MURAKAMI,SHAIK M. ZAKEERUDDIN,SUSUMU KAYAMA,MICHAEL GR€ ATZEL,Tetsuo Yazawa,MASAO MIZUNO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.5
Di®erent-sized nanocrystalline-TiO 2 particles have been used for the optimization of photovoltaice®ects of dye-sensitized solar cells (DSCs) using an ionic-liquid (IL) electrolyte. Ru dye (Z907)was used for the IL-DSC optimization. The TiO 2 nanoparticle sizes and the thickness of nano-crystalline-TiO 2 electrodes ranged from 13 nm to 81 nm and 2 ? m to 23 ? m, respectively. Theparticle size of the nanocrystalline TiO 2 ¯lm greatly a®ected the photovoltaic characteristics,particularly for the IL electrolyte due to limitation of the photocurrent by I?/I?3-di®usion. Theoptimized electrode for IL-DSC had a 15 ? m thickness using a 27 nm diameter of nanocrystalline-TiO 2 particles. In order to characterize the e®ect of the TiO 2 particle size on the photovoltaice®ects of IL-DSCs, a scanning electron micrograph (surface and cross section of nanoparticles),BET speci¯c surface area analysis, pore-size distribution analysis, photocurrent transient measurements, haze spectroscopy, photovoltaic measurements, incident-photon-to-currentconversion e±ciency spectroscopy and impedance measurement have been used.
Garcí,a-Iglesias, Miguel,Yum, Jun-Ho,Humphry-Baker, Robin,Zakeeruddin, Shaik M.,Pé,chy, Peter,Vá,zquez, Purificació,n,Palomares, Emilio,Grä,tzel, Michael,Nazeeruddin, Moham Royal Society of Chemistry 2011 Chemical science Vol.2 No.6
<P>We have designed and developed an unsymmetrical zinc phthalocyanine (TT9) sensitizer that consists of three <I>tert</I>-butyl and two carboxylic acid groups that act as “<I>push</I>” and “<I>pull</I>”, respectively. The two carboxylic acid groups graft the sensitizer onto the semiconductor surface resulting in enhanced stability under heat and light compared to the similar unsymmetrical zinc phthalocyanine (TT1) sensitizer that consists of three <I>tert</I>-butyl and only one carboxylic acid groups. The solar cells containing the TT9 and TT1 sensitizers with non-volatile electrolyte were subjected to light soaking conditions at 60 °C. Under these conditions, the short circuit current of the TT1 sensitized solar cell after 1000 h decreases to half of its initial value where as the TT9 sensitized solar cell remained the same demonstrating the influence of number of anchoring groups on the stability of zinc phthalocyanine sensitized solar cells.</P> <P>Graphic Abstract</P><P>Phthalocyanine TT9 (red) grafts onto the semiconductor surface resulting in enhanced stability compared to TT1 (black). <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0sc00602e'> </P>
Lee, Hyo Joong,Chang, Dong Wook,Park, Su-Moon,Zakeeruddin, Shaik M.,Grä,tzel, Michael,Nazeeruddin, Md. K. Royal Society of Chemistry 2010 Chemical communications Vol.46 No.46
<P>Redox couples based on cobalt complexes were found to be effective in regenerating both inorganic CdSe quantum dot- and organic dye-sensitizers. The hybrid sensitizer composed of CdSe QD and ruthenium sensitizer (Z907Na) dye showed a maximum power conversion efficiency of 4.76% on using cobalt(<I>o</I>-phen)<SUB>3</SUB><SUP>2+/3+</SUP> as a common redox mediator.</P> <P>Graphic Abstract</P><P>The hybrid sensitizer composed of CdSe QD and Z907Na dye showed a maximum power conversion efficiency of 4.76% by using cobalt(<I>o</I>-phen)<SUB>3</SUB><SUP>2+/3+</SUP> as a common redox mediator. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cc03808c'> </P>
Nanowire Perovskite Solar Cell
Im, Jeong-Hyeok,Luo, Jingshan,Franckevič,ius, Marius,Pellet, Norman,Gao, Peng,Moehl, Thomas,Zakeeruddin, Shaik Mohammed,Nazeeruddin, Mohammad Khaja,Grä,tzel, Michael,Park, Nam-Gyu American Chemical Society 2015 NANO LETTERS Vol.15 No.3
<P>Organolead iodide perovskite, CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB>, was prepared in the form of nanowire by means of a small quantity of aprotic solvent in two-step spin-coating procedure. One-dimensional nanowire perovskite with the mean diameter of 100 nm showed faster carrier separation in the presence of hole transporting layer and higher lateral conductivity than the three-dimensional nanocuboid crystal. Reduction in dimensionality resulted in the hypsochromic shift of both absorption and fluorescence spectra, indicative of more localized exciton states in nanowires. The best performing device employing nanowire CH<SUB>3</SUB>NH<SUB>3</SUB>PbI<SUB>3</SUB> delivered photocurrent density of 19.12 mA/cm<SUP>2</SUP>, voltage of 1.052 V, and fill factor of 0.721, leading to a power conversion efficiency (PCE) of 14.71% at standard AM 1.5G solar illumination. A small <I>I</I>–<I>V</I> hysteresis was observed, where a PCE at forward scan was measured to be 85% of the PCE at reverse scan.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2015/nalefd.2015.15.issue-3/acs.nanolett.5b00046/production/images/medium/nl-2015-00046q_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl5b00046'>ACS Electronic Supporting Info</A></P>
Burschka, Julian,Brault, Vincent,Ahmad, Shahzada,Breau, Livain,Nazeeruddin, Mohammad K.,Marsan, Benoî,t,Zakeeruddin, Shaik M.,Grä,tzel, Michael The Royal Society of Chemistry 2012 ENERGY AND ENVIRONMENTAL SCIENCE Vol.5 No.3
<P>Strong scientific interests focus on the investigation of iodine-free redox couples for their application in dye-sensitized solar cells (DSCs). Recently, a disulfide/thiolate-based redox electrolyte has been proposed as a valuable alternative to the conventional I<SUB>3</SUB><SUP>−</SUP>/I<SUP>−</SUP> system due to its transparent and non-corrosive nature. In the work presented herein, we systematically studied the influence of different counter electrode materials on the photovoltaic performance of DSCs employing this promising organic redox electrolyte. Our investigations focused on understanding the importance of electrocatalytic activity and surface area of the electroactive material on the counter electrode, comparing the conventional platinum to cobalt sulfide (CoS) and poly(3,4-ethylenedioxythiophene) (PEDOT). Electrochemical Impedance Spectroscopy has been used to study in detail the interfacial charge transfer reaction at the counter electrode. By using a high surface area PEDOT-based counter electrode, we finally achieved an unprecedented power conversion efficiency of 7.9% under simulated AM1.5G solar irradiation (100 mW cm<SUP>−2</SUP>) which, to the best of our knowledge, represents the highest efficiency that has so far been reported for an organic redox couple.</P> <P>Graphic Abstract</P><P>Investigation of platinum-free electrocatalysts for disulfide-to-thiolate reduction in dye-sensitized solar cells leading to a new record efficiency of 7.9%. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2ee03005e'> </P>