Introduction The interface control between the glass substrate (or Si wafer) and glass is one of the main research areas in electronic applications because the physical and chemical properties of glasses are related to the reliability of devices. A recent survey suggested that the efficiency of screen-printed silicon solar cells should mainly be decided by good quality front contacts. For instance, in Si-solar cells, the thermal properties of the frit are closely related to the electrical properties of the cells, the Ag crystalline growth, and the distribution of Ag crystalline. Furthermore, glasses can also be applied to the sealing materials and Ag protecting layers of DSSC (Dye-Sensitized Solar Cells) for the thermal, chemical stability and high performances of modules. Screen-Printed Silicon Solar Cells (Ref. Hindawi Publishing Corporation Advances in Optoelectronics,Volume 2007, Article ID 24521, 15 pages, doi: 10.1155/2007/24521) Frits in Ag paste promote the sintering behaviors of Ag powders and enable Ag electrode to connect Si wafer during a fast firing. The thermophysical behaviors of frits in Ag paste have influence on the electrical properties of solar cells. It is needed to control thermal properties for the optimal cell performance. Dye-Sensitized?Solar Cells Figure 2. Schematic diagram of the cross section of DSSC (Z type) with two glass plates. It was reported that the degradation of DSSC modules occurred with the leakage of electrolytes, which is resulted from weak chemical durability and thermal deformation of sealing materials. Therefore, the chemical and thermal stability of sealing materials are required for the large scale and reliability of DSSC. Recently, the application of frits has been reviewed as a sealing material with the durability for electrolytes and thermal stability.