| 초록 |
Controlling back electron transfer in dye-sensitized solar cells (DSSCs) is considered to be an important part of the project of improving their energy conversion efficiencies. In order to prevent the efficiency losses caused by electron back transfer to the electrolyte from transparent conducting oxide (TCO) substrate, a compact TiO2 film was prepared by reactive sputtering; its application in DSSCs as an electrolyte-blocking layer was then tested. The TiO2 blocking layer was characterized with field-emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and X-ray diffraction (XRD), and its J-V characteristics under illumination and its dark current voltage characteristics were measured. The sputtered TiO2 film acts as electrolyte blocking layer and results in improvements in Voc and Jsc. |
