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RISS 인기검색어
- 검색키워드
- 저자 : Burschka, Julian (검색결과 2 건)
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Burschka, Julian,Dualeh, Amalie,Kessler, Florian,Baranoff, Etienne,Cevey-Ha, Ngoc-Lê,Yi, Chenyi,Nazeeruddin, Mohammad K.,Grä,tzel, Michael American Chemical Society 2011 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.133 No.45
<P>Chemical doping is an important strategy to alter the charge-transport properties of both molecular and polymeric organic semiconductors that find widespread application in organic electronic devices. We report on the use of a new class of Co(III) complexes as p-type dopants for triarylamine-based hole conductors such as spiro-MeOTAD and their application in solid-state dye-sensitized solar cells (ssDSCs). We show that the proposed compounds fulfill the requirements for this application and that the discussed strategy is promising for tuning the conductivity of spiro-MeOTAD in ssDSCs, without having to rely on the commonly employed photo-doping. By using a recently developed high molar extinction coefficient organic D-π-A sensitizer and p-doped spiro-MeOTAD as hole conductor, we achieved a record power conversion efficiency of 7.2%, measured under standard solar conditions (AM1.5G, 100 mW cm<SUP>–2</SUP>). We expect these promising new dopants to find widespread applications in organic electronics in general and photovoltaics in particular.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2011/jacsat.2011.133.issue-45/ja207367t/production/images/medium/ja-2011-07367t_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja207367t'>ACS Electronic Supporting Info</A></P>
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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>
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