TECHNOLOGY FOCUS - POLYMERS - Preferred Substrate: The substrate is a cyclic olefin type addition copolymer containing repeating unit (a) chosen from repeating unit of formulae ((1-1)-(1-4)), and repeating unit (b) of formula (2). The copolymer is obtained by carrying out an addition polymerization of tricyclo olefin compound having endo group ratio of 80 mol% or more, and hydrogenating, when an olefinic saturated bond exists.R1-R20, A1-A4 = H, halogen atom, 1-20C hydrocarbon group or halogenated hydrocarbon group; andm = 0 or 1.Preferred Properties: The copolymer is uniformly soluble in 25 degrees C toluene and/or cyclohexane. The number average molecular weight of the copolymer, based on polystyrene conversion is 30000-500000.Preferred Compound: The high order silane compound (B) is preferably a compound of formula: SikR1, hydrogenated strand shaped silane compound of formula: SiqH2q+2, hydrogenated cyclic silane compound of formula: SirH2r and hydrogenated cage-like silane compound of formula: SisHs.k = at least11;l = k-(2k+2);q = 2-10;r = 3-10; ands = 6-10.The silane compound is capable of receiving and generating light irradiation.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The silicon film forming composition further contains an inorganic powder, a binder resin, a tin compound of formula: Sn(OCOR)d(OR)eX2f, and an indium compound of formula: In(OCOR)a(OR)bX1c.R = 1-10C alkyl;X1, X2 = halogen atom; anda-f = 0-3. SPECIFIC COMPOUNDS - The high order silane compound is preferably of formulae (B1-B3).    EXAMPLE - Cyclic olefin type addition copolymer obtained by reacting bicyclo (2.2.1), endo tricyclo (5.2.1.02,6) deca-8-en, 1-hexene, 5-triethoxy silyl bicyclo (2.2.1) deca-8-en, methylene chloride and cyclohexane, hexafluoro antimonic acid, hexane solution of octanoic acid nickel, boron trifluoride ethyl, methyl alumoxane, 1,5-cycloocta diene and methyl triethoxysilane was used for obtaining a substrate. Lithium metal (in g) (18.3), dry tetrahydrofuran (1 l) and diphenyl dichlorosilane (333) were mixed to obtain a reaction mixture. The obtained reaction mixture was washed with water and filtered to obtain white solid (140). The obtained white solid (100), dry cyclohexane (1000 ml), aluminum chloride (4), lithium hydride aluminum (40) and diethyl ether (400 ml) were mixed and stirred for 12 hours. The reaction product was vacuum distillated to obtain cyclopenta silane. The obtained cyclopenta silane was stirred in argon atmosphere to obtain cyclopenta silane solution of high order silane. Xylene (340), carbon tetrachloride (60), silicon powder (60) of mean particle diameter 100 microns and 1% hydrofluoric acid were mixed to obtain xylene dispersion liquid of silicon microparticles. The obtained dispersion liquid (100) and the obtained cyclopenta silane solution (10) were mixed to obtain i-type silicon film forming composition (A). The obtained i-type silicon film forming composition was doped with boron atom to obtain p-type silicon film forming composition (B), and doped with phosphorus atom to obtain n-type silicon film forming composition (C). The obtained compositions (A-C) were sequentially laminated between a pair of electrodes. The laminate was laminated on the obtained substrate, to obtain a solar cell. The obtained solar cell had an electric power generation efficiency of 2% in the illumination intensity of 100 mW/cm2 and release voltage of 0.45 V.