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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>
Charged cyclometalated iridium(III) complexes that have large electrochemical gap
Shavaleev, N.M.,Scopelliti, R.,Baranoff, E.,Gratzel, M.,Nazeeruddin, M.K. Elsevier Sequoia [etc.] 2012 Inorganica chimica acta Vol.383 No.-
Bis-cyclometalated cationic Ir(III) diimine complexes [Ir(C@<SUP>N</SUP>)<SUB>2</SUB>(N@<SUP>N</SUP>)](PF<SUB>6</SUB>) with 1-phenylpyrazoles (C@<SUP>N</SUP>) and 1-(4'-tert-butyl-2'-pyridyl)pyrazole (N@<SUP>N</SUP>) are white solids that have absorption onset below 425nm and electrochemical gap of up to 3.5V.
A new generation of platinum and iodine free efficient dye-sensitized solar cells
Ahmad, Shahzada,Bessho, Takeru,Kessler, Florian,Baranoff, Etienne,Frey, Julien,Yi, Chenyi,Grä,tzel, Michael,Nazeeruddin, Mohammad K. The Royal Society of Chemistry 2012 Physical chemistry chemical physics Vol.14 No.30
<P>We report a series of cobalt complexes with various polypyridyl ligands, where the oxidation potential is tuned from 0.17 to 0.34 V <I>vs.</I> ferrocene. The highest occupied molecular orbitals (HOMO) of the cobalt complexes were stabilized by adding electron acceptor groups on pyridyl or replacing pyridyl by pyrazole. These complexes are then used as one-electron redox mediators in dye sensitized solar cells (DSSCs) together with polymer based cathode resulting in an excellent performance. The performance of DSSCs using the molecularly engineered cobalt redox shuttle and poly(3,4-alkylthiophenes) based cathode is better than the triiodide/iodide redox shuttle with platinized cathode. The use of high surface area poly(3,4-propylenedioxythiophene) based nanoporous layers allows higher catalytic activity thus minimizing the electrode–electrolyte interface issues.</P> <P>Graphic Abstract</P><P>Molecularly engineered cobalt redox shuttles with tunable oxidation potential, when employed with polymer cathode are new work horse for DSSCs. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp41611e'> </P>
Dualeh, Amalie,De Angelis, Filippo,Fantacci, Simona,Moehl, Thomas,Yi, Chenyi,Kessler, Florian,Baranoff, Etienne,Nazeeruddin, Mohammad K.,Grä,tzel, Michael American Chemical Society 2012 The Journal of Physical Chemistry Part C Vol. No.
<P>In solid-state dye-sensitized solar cells (ssDSCs), the poor pore filling of the mesoporous semiconductor and the short diffusion length of charge carriers in the hole-transport material (HTM) have limited the mesoscopic titania layer to a thickness of 2–3 μm. To increase the amount of light harvested by ssDSCs, organic dyes with high molar extinction coefficients are of great importance and have been the focus of intensive research. Here we investigate ssDSCs using an organic D−π–A dye, coded Y123, and 2,2′,7,7′-tetrakis(<I>N</I>,<I>N</I>-di-<I>p</I>-methoxyphenylamine)-9,9′-spirobifluorene as a hole-transport material, exhibiting 934 mV open-circuit potential and 6.9% efficiency at standard solar conditions (AM1.5G, 100 mW cm<SUP>–2</SUP>), which is a significant improvement compared to the analogue dyes C218, C220, and JK2 (<I>V</I><SUB>oc</SUB> values of 795, 781, and 914 mV, respectively). An upward shift in the conduction band edge was observed from photovoltage transient decay and impedance spectroscopy measurements for devices sensitized with Y123 and JK2 dyes compared to the device using C220 as sensitizer, in agreement with the high photovoltage response of the corresponding ssDSCs. This work highlights the importance of the interaction between the HTM and the dye-sensitized TiO<SUB>2</SUB> surface for the design of ssDSCs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2012/jpccck.2012.116.issue-1/jp209691e/production/images/medium/jp-2011-09691e_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp209691e'>ACS Electronic Supporting Info</A></P>