Quasi-solid dye sensitised solar cells filled with phase-separated chemically cross-linked ionic gels

Quasi-solid state dye-sensitized solar cells based on pyridine or imidazole containing copolymer chemically crosslinked gel electrolytes

“…A 40-80 mV increased open circuit voltage (V oc ) compared with the corresponding ionic liquid electrolytes has been found for Hayase's PVP chemically crosslinked gel electrolytes [7] . While for Yanagida's imidazole system, a large V oc was first observed for the precursor electrolyte but subsequently decreased after solidification to the same value as that of the ionic liquid electrolyte [9] .…”

“…Backbone polymers of polyvinylpyridine (PVP) or alkylbis(immidazole)s and crosslinkers of halogen derivatives in situ chemically crosslinking ionic liquid electrolytes were reported by Hayase [6][7][8] and Yanagida [9] groups respectively. A 40-80 mV increased open circuit voltage (V oc ) compared with the corresponding ionic liquid electrolytes has been found for Hayase's PVP chemically crosslinked gel electrolytes [7] .…”

“…Firstly, the fluidity of the precursor electrolytes benefited the electrolyte penetration into TiO 2 porous film. Secondly, quaterization reactions proceeded in the presence of triiodide/iodide redox couple, thus liquid electrolytes could be solidified in situ of the cells [6][7][8][9][10] .…”

“…Firstly, the fluidity of the precursor electrolytes benefited the electrolyte penetration into TiO 2 porous film. Secondly, quaterization reactions proceeded in the presence of triiodide/iodide redox couple, thus liquid electrolytes could be solidified in situ of the cells [6][7][8][9][10] .Backbone polymers of polyvinylpyridine (PVP) or alkylbis(immidazole)s and crosslinkers of halogen derivatives in situ chemically crosslinking ionic liquid electrolytes were reported by Hayase [6][7][8] and Yanagida [9] groups respectively. A 40-80 mV increased open circuit voltage (V oc ) compared with the corresponding ionic liquid electrolytes has been found for Hayase's PVP chemically crosslinked gel electrolytes [7] .…”

A Series of N-Alkylimidazolium Propylhexanamide Iodide for Dye-Sensitized Solar Cells

“…2,3 However, long-term stability of the cell has been a major concern due to the use of volatile organic solvent, which often causes leakage of the electrolyte and degradation of the cell at elevated temperature. To overcome this problem several research groups have introduced inorganic p-type semiconductors, 4,5 organic hole transport materials, 6 ionic liquids (IL's) based gel electrolytes, [7][8][9][10] and solid state electrolytes. [11][12][13] Even though the DSSCs containing the above hole transport materials or redox mediators without any volatile organic solvent were thermally stable for long time, the cells still can suffer from the low efficiency because of the poor ionic conductivity and insufficient infiltration of the redox mediators through the mesoporous layer of nanocrystalline TiO 2 .…”