Study Of The Structure And Properties Of CuI Solid-state Electrolyte In Dye-sensitized Solar Cell

Nowadays, there is a growing concern on solid-state dye-sensitized photovoltaiccells, because it has a high stability. At the same time maintain its high stability, how toimprove the electrical performance of the solid-state dye-sensitized photovoltaic cellsbecomes the research focus. In this text, nano-porous TiO₂films were deposited onfluorine-doped conducting tin oxide glass（FTO）. And then CuI was deposited on thedye-sensitized TiO₂films surface. The cell was fabricated by pressing a platinum coatedFTO glass plate onto the CuI/dye/TiO₂electrode. The surface morphology of CuI filmsand TiO₂films was studied by scanning electron microscope （SEM）. And we obtainedthe best process parameters to produce the solid-state electrolyte of CuI. We exploredthe impact of different additives to the structure and morphology of CuI solid-stateelectrolyte. And acquired optimum conditions produce high photoelectric efficiencysolid-state dye-sensitized photovoltaic cells.Disposed P25powder by nitric acid dispersion method, and then made into TiO₂pastes. It could gain nano-porous TiO₂films by using Powder coating method.Exposed to the air, the solution of CuI will be oxidized with time. And the solid-stateelectrolyte of CuI prepared by oxidized solution of CuI would serious impact on thephotoelectric performance of DSSC. The solution of CuI should be used within3hours.Dense and uniform CuI films were prepared on preheated FTO glass by usingdip-coating method. We could make best quality of CuI films when the content ofisopropanol additive is5%, preheated temperature is100℃and dip-coat4times. Withan increasing time of dip-coat, CuI particle would appear secondary growth instead ofre-nucleation and growth.The photoelectric properties of DSSC will be increased by add some isopropanolor emulsifier OP or1-ethyl-3-methylimidazolium thiocyanate（EMISCN） into thesolution of CuI respectively. Because the grow th of CuI crystal particles can beinhibited by the additives; the matching of crystal particles size of CuI and pores size ofporous TiO₂films can be improved. The photoelectric properties of DSSC will be bestwhen the content of EMISCN is5mol%. And the photoelectric properties of DSSC willbe significantly improved when add some corresponding solution of CuI onto theCuI/dye/TiO₂electrode.Solid-state dye-sensitized photovoltaic cells have best stability, compared toLiquid and quasi-solid electrolyte dye-sensitized photovoltaic cells. And the cells’stability was better after adding some emulsifier OP compared to EMISCN.Although the stability of the CuI solid-state electrolyte dye-sensitized photovoltaic cells is better, its photoelectric properties are much lower than the liquid and quasi-solidelectrolyte dye-sensitized photovoltaic cells. Effectively improve the photoelectricproperties of the solid-state electrolyte dye-sensitized photovoltaic cells is the toppriority at the moment.