TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The rear surface protective member has a multilayer structure with a metal thin film between resin layers. The rear surface protective member includes an insulation layer made of either silicon oxide or metal oxide, and layers made of resin materials but not metal materials. A sodium-blocking layer for preventing sodium permeation is provided between the front surface member and the solar cell element, or provided on a surface, which is adjacent to the front surface member, of the solar cell element. Preferred Property: The water vapor transmission rate of the rear surface protective member is less than or equal to30, preferably less than or equal to15 or 0.1 or 0.02 g/m2-24 hours (40?C, 90%).    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The electrically conductive powder to be mixed in the electrically conductive paste includes approximately granulated electrically conductive filler and flaky electrically conductive filler. A content of the approximately granulated electrically conductive filler to total weight of both conductive fillers is 40-80 wt.%. Preferred Material: The front surface member is made of materials containing sodium.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The electrically conductive powder to be mixed in the electrically conductive paste includes approximately granulated electrically conductive filler and flaky electrically conductive filler. A content of the approximately granulated electrically conductive filler to total weight of both conductive fillers is 40-80 wt.%. Preferred Material: The front surface member is made of materials containing sodium.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The resin having the glass transition temperature of 80-200 or 90-200degreesC measured by the TMA method has an epoxy. It is phenolic resin, or polyimide resin. The thermosetting resin contains epoxy resin at a controlled volume ratio according to a water vapor transmission rate of the rear surface protective member; or contains greater than or equal to98, greater than or equal to90, greater than or equal to80 or 70 vol.% epoxy resin. Preferred Property: The epoxy resin has a glass transition temperature of 80-200degreesC that is measured by the TMA method.