TECHNOLOGY FOCUS - POLYMERS - Preferred Materials: The terpolymer contains (wt.%) an ethylene (65 - 89.9), an unsaturated fatty acid ester (10 - 30) and an unsaturated fatty acid (0.1 - 5) and contains an ultraviolet absorber, a hindered amine light stabilizer, a silane coupling agent and a hindered phenol antioxidant. The terpolymer has a bicut softening point of 40 - 110degreesC and has a total light permeability of at least 90% over a wavelength range of 400 - 1000 nm when the terpolymer has a thickness of 0.5 mm.    TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Photovoltaic Element: (1) has a semiconductor photoactive layer on a conductive substrate as a first electrode, which is a light-convert member and a transparent conductive layer as a second electrode. The semiconductor photoactive layer contains an amorphous semiconductor or a microcrystal semiconductor. A short circuited portion of (1) is repaired by a defect removing treatment. (1) is bonded to a building material via an adhesion layer and has a shunt resistance of 1 - 500 k Ohm cm2.(1) has a collecting electrode on the light-receiving surface and the terpolymer is placed in contact with the collecting electrode. The light-receiving surface is covered with the terpolymer and then a thin fluoride polymer film is stacked as on it the outermost layer. The highest operating temperature of the solar cell module is at least 80degreesC.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Ultraviolet Absorber: The ultraviolet absorber is a derivative of benzophenone or benzotriazole.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The conductive substrate is made of stainless steel. The amorphous semiconductor is of silicon. The collecting electrode contains copper or silver. SPECIFIC COMPOUNDS - A methyl acrylate, ethyl acrylate and (iso)butyl acrylate are specifically claimed as the acrylic ester. Methyl methacrylate, ethyl methacrylate and (iso)butyl methacrylate are specifically claimed as the methacrylic esters.    EXAMPLE - On a stainless steel substrate, aluminum (Al) and zinc oxide (ZnO) layers were formed successively as the black surface reflective layers. An n-type a-silicon layer from a mixed gas of silane (SiH4), phosphine (PH3) and hydrogen (H2), an i-type a-silicon layer from a mixed gas of SiH4 and H2 and a p-type microcrystal silicon layer from a mixed gas of SiH4, boron trifluoride (BF3) and H2 were formed to form a tandem-type a-silicon photoelectric conversion semiconductor layer. Then as a transparent conductive layer, an indium oxide (In2O) thin film was formed. Then the photovoltaic element was subjected to a defect treatment. Further, the grid-shaped collecting electrode was formed by screen-printing a silver paste and finally a copper tab was attached as the negative terminal on the stainless steel substrate and a silver foil tape was attached as the positive terminal on the collecting electrode. Several such formed photovoltaic elements were connected in series.    The sealing material was prepared by mixing (parts by weight) 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane (3), 2-hydroxy-4-n-octoxybenzophenone (0.3), gamma-methacryloxypropyltrimethoxysilane (0.3), bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate (0.1) and tris(mono-nonylphenyl)phosphite (0.2), based on 100 parts by weight of an ethylene-methyl acrylate-maleic anhydride terpolymer (EMM) resin pellet, melting the obtained mixture and extruding into a sheet. As the front surface film was used an ethylene tetrafluoride-ethylene copolymer (ETFE) film and as the back surface film was used a polyethylene terephthalate (PET) film. As a supporting plate was used a roofing galbarium steel plate. The EMM sheet and the PET film and the supporting plate were laminated on the back surfaces of the element. Using the prepared sealing material, the group of photovoltaic elements were laminated and the laminate was heated at 150degreesC.    A comparative solar cell module was obtained in the same manner as the test module except that an ethylene-vinyl acetate (EVA) resin was used in place of the EMM resin. The test module showed no change in appearance when subjected to weather, moisture and heat resistance test, while the comparative module showed peeling between the front surface film and the sealing material, and the copper tab with discolored green sealing material and discolored yellow sealing material when subjected to the same test. The reduction ratios of conversion efficiency (%) and of shunt resistance (%) for test/comparative were 2/23 and 73/99 respectively.