Design On Structure Of Photocathode Film For Dye-Sensitized Solar Cells And Their Properties

Dye-sensitised solar cells (DSSC) as one of the third generation solar cells,because of its high conversion efficiency, simple process and characteristics ofenvironmental friendly, these make DSSC has been closely watched. Photocathodesmaterials，which is an important part in dye-sensitised cells, is the carrier of electrontransmission, the material of photocathode is mainly divided into two parts: the oneis P type semiconductor nano-materials, the other is metal platinum. In this paper, todevelop high performance and low cost DSSC, from the photocathode materialsynthesis, photocathode making exploration and DSSC assembly process, thesethree aspects developed two different photocathode material of high-performanceDSSC.Specific as follows:First, according to the factors such as dye and the sun ray’s wavelength, wechose the matching energy level cuprous oxide and nickel oxide as the photocathodematerial. By simple water bath method and optimizing the synthesis conditions, weobtained the cuprous oxide with special morphology, and then prepared Cu2Ophotocathode. In addition, using hydrothermal method with nickel foam as thetemplate, by adjusting the precursor species, synthesized different morphology ofthree-dimensional nickel oxide, researching the morphology affects of NiO onDSSC performance.Second, researching on Cu2O-DSSC photocathode production process, mainlyuse the blade coating and the in situ growth technology to obtain photocathode.Compared with the in situ growth method, in the low temperature blade coatingmethod, by changing the type and ratio of slurry solvent, create good smoothnessand continuity of Cu2O photocathode. DSSC performance test results show that bothprepared Cu2O powder (Jsc=1.3mA/cm2,=0.42%) or commercial Cu2Oparticles (Jsc=0.63mA/cm2,=0.17%) exhibit high performance measured under AM1.5G (100mW/cm2) illumination. What’s more, the cuprous oxide (withone-dimensional truncated cubic) DSSC show better photoelectric properties.Three, focus on the structure of the NiO-DSSC without platinum electrodeassembly process, design, plane and plane sandwich structure respectively.Compared to other electrode structure, plane sandwich structure (TiO2-Ni-NiO-bDSSC, Jsc=5.13mA/cm2,=1.95%) exhibited excellent photoelectric properties,Nyquist chart indicates that the NiO and Pt have the same catalytic activity.