Anomalous Increase in Photocurrent Density for Quasi-solid Dye Sensitized Solar Cells by Addition of Tetra(bromomethyl)benzene

Abstract

Anomalous phenomena on gel electrolytes for quasi-dye sensitized solar cells are reported. Performances for gel electrolytes usually decrease with an increase in the amount of gelators. When tetra(bromomethyl)benzene providing three dimensional ionomer gel electrolytes is used, photocurrents increase with an increase in the amount of the gelator. This may be explained partially by decrease in interfacial resistances between gel electrolytes and electrodes.

Ionic liquid type dye-sensitized solar cells: increases in photovoltaic performances by adding a small amount of water

“…I À /I 3 À redox potential was measured by using a I À /I 3 À electrode as a reference electrode. Electrolytes consisting of 60 mM of MePrImI, 10 mM of I 2 and a certain amount of water in acetonitrile were employed [4][5][6][7][8][9][10][11][12][13][14][15][16]. The redox potential variation on water addition was measured relatively in the model electrolytes.…”

“…Additions of a large amount of iodine in- circuit voltage (V oc ) because of the increase in the dark current. We have focused on a small amount of water as the additive to ionic type electrolytes [7][8][9][10][11][12][13]. In this reports, the effects of water addition on photovoltaic performances for DSCs are discussed in terms of electrolytes and TiO 2 properties.…”

A polymer gel electrolyte composed of a poly(ethylene oxide) copolymer and the influence of its composition on the dynamics and performance of dye-sensitized solar cells

“…In order to enhance the overall conversion efficiency and, as a consequence, the transport properties, the nature of the polymer (gel) systems must be modified. Addition of inorganic nanofillers [19,18], crown ether molecules [24], ionic liquids [25][26][27], oligomers based on ethylene oxide [28,29], gelators [30,31], and compounds such as (t-butylpyridine, t-bromomethylbenzene, acetic acid and gamma-butyrolactone (GBL)) [32,33] have become a common route to elaborate polymer (or gel) electrolytes with improved ionic conductivity properties. Recently, we demonstrated how the LiI concentration in the copolymer poly(ethylene oxide-co-epichlorohydrin) affects the DSSC kinetics and its correlation with the device's efficiency [34].…”

High performance dye-sensitized solar cells containing 1-methyl-3-propyl imidazolinium iodide-effect of additives and solvents

“…Among the different cations, substituted imidazolinium iodides have been used as liquid [25][26][27][28] and quasi solid state electrolytes [29][30][31][32][33] in the solar cells. They contribute to the enhancement of conductivity of I À =I À 3 electrolyte and their multilayer adsorption on the TiO 2 surface leads to the enhancement in electron diffusion coefficient [34].…”