Dye-sensitized solar cells (DSSCs) with a nanocrystalline TiO2 as a anode incorporating a free-standing and flexible light- scattering film composed of sub-micrometer-sized Al2O3 particles with a small amount of ion-transportable polymeric binder were prepared and compared to DSSCs composed of a nanocrystalline TiO2/sub-micrometer-sized TiO2 bilayer as an anode. The cell efficiency of the former was higher than that of the latter. This implies that the enhancement of the light absorption as that obtained with a general DSSC with light-scattering layer (sub-micrometer-sized TiO2) is possible by combining a high-surface-area layer of nanocrystalline TiO2 and free-standing light scattering film. The novel DSSCs with the free-standing light scattering film showed an additional resistance, which was characterized by the electrochemical impedance analysis. However, the cell performance was not seriously influenced by the additional resistance. When the free-standing scattering film was assembled with flexible type DSSCs, not only a greatly enhanced power conversion efficiency but also better long-term stability than the DSSC without the light scattering film were observed.
All Science Journal Classification (ASJC) codes
- Materials Science(all)