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EFFECT OF THE CHROMOPHORES STRUCTURES ON THE PERFORMANCE OF SOLID-STATE DYE SENSITIZED SOLAR CELLS
HAINING TIAN,Eva M. Barea,ANDREA SOTO,BO XU,LICHENG SUN,ANDERS HAGFELDT,FRANCISCO FABREGAT-SANTIAGO,IVAN MORA-SERO,강용수,Juan Bisquert 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.5
The efect of metal-free chromophores on dye-sensitized solar cell performance is investigated. Solid state dye-sensitized solar cells (ssDSCs) using diferent molecular sensitizers based on tri-phenylamine (TPA) with thiophene linkers and diferent alkyl chain in the donor unit have beencharacterized using impedance spectroscopy (IS). We show that diferent molecular structuresplay a fundamental role on solar cell performance, by the efect produced on TiO 2 conductionband position and in the recombination rate. Dye structure and its electronic properties are themain factors that control the recombination, the capacitance and the e±ciency of the cells. Aclear trend between the performance of the cell and the optimization level of the blocking efect of the dye structure has been identi¯ed in the solid state solar cells with Spiro-OMeTAD holeconductor.
Perimeter leakage current in polymer light emitting diodes
Germà Garcia-Belmonte,José M. Montero,Yassid Ayyad-Limonge,Eva M. Barea,Juan Bisquert,Henk J. Bolink 한국물리학회 2009 Current Applied Physics Vol.9 No.3
Observation of leakage current paths through the device perimeter in standard poly(phenylene vinylene)-based light-emitting devices is reported. Perimeter leakage currents govern the diode performance in reverse and low positive bias and exhibit an ohmic character. Current density correlates with the perimeter-to-area ratio thus indicating that leakage currents are mainly confined on polymer regions in the vicinity of metallic contact limits (device perimeter). Observation of leakage current paths through the device perimeter in standard poly(phenylene vinylene)-based light-emitting devices is reported. Perimeter leakage currents govern the diode performance in reverse and low positive bias and exhibit an ohmic character. Current density correlates with the perimeter-to-area ratio thus indicating that leakage currents are mainly confined on polymer regions in the vicinity of metallic contact limits (device perimeter).
Kim, Tea-Yon,Song, Donghoon,Barea, Eva M.,Lee, Jung Hyun,Kim, Young Rae,Cho, Woohyung,Lee, Sungjin,Rahman, Mohammed M.,Bisquert, Juan,Kang, Yong Soo unknown 2016 Nano energy Vol.28 No.-
<P><B>Abstract</B></P> <P>Herein, the energy level alignment and electron recombination kinetics in solid state dye-sensitized solar cells (DSCs) employing a solid polymer electrolyte (SPE) have been quantitatively characterized. In order to determine the microscopic origin of the enhanced characteristics in polymer electrolytes, we carried out an extensive study of the photovoltaic properties with respect to the electrolyte type and composition, including a liquid electrolyte (LE) and various salt types and concentrations. We observed a smaller downward shift in the conduction band energy of the TiO<SUB>2</SUB> layer upon contact with the SPE as well as a retarded electron recombination rate. These led to an increase in the <I>V</I> <SUB>oc</SUB> for DSCs with an SPE, which is mostly attributable to the coordinative interactions of the ethylene oxide (EO) units in poly(ethylene oxide) (PEO) and poly(ethylene glycol) dimethyl ether (PEGDME) with metallic Li<SUP>+</SUP> ions and Ti atoms. Such coordinative interactions induce 1) the capture of Li<SUP>+</SUP> cations in the bulk of the polymer electrolyte, thereby reducing their effective concentration and 2) the facile formation of a PEO passivation layer on top of the TiO<SUB>2</SUB> layer. Therefore, it was concluded that the high <I>V</I> <SUB>oc</SUB> in solid state DSCs employing a polymer electrolyte is attributable to the coordinative properties of the EO units in PEO and PEGDME in the SPE.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The origin of high open-circuit voltage in solid state dye-sensitized solar cells with PEO-based polymer electrolyte has been firstly unveiled. </LI> <LI> New quantitative analysis of TiO<SUB>2</SUB> conduction band shift was introduced by measuring the change in the Fermi voltage with varying the concentration of the salts. </LI> <LI> PEO containing the EO groups captured cations in electrolyte and also coordinatively adsorbed on the surface of the TiO<SUB>2</SUB> layer. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>