Hydrolysis stable compositions for films in solar cells

A solar cell module comprising a transparent film containing

• polylactide (PLA), polyethylene terephthalate (PET), or a combination thereof;
• and
• about 0.5 to about 2.5% by weight of at least one polymeric carbodiimide according to formula (I)
• where:
• R1 may be identical or different and is selected from the group comprising NHCONHR3, —NHCONR3R4 or —NHCOOR5, wherein:
• R3 and R4 are identical or different and represent a C1-C12-alkyl, C6-C12- cycloalkyl, C7-C18-aralkyl radical or aryl radical, and
• R5 represents a C1-C22-alkyl, C6-C12-cycloalkyl, C6-C18-aryl or C7-C18-aralkyl radical, an unsaturated alkyl radical having 2-22 carbon atoms,-or an alkoxypolyoxy-C1-C12-alkylene radical,
• R6, R7 and R8 are each independently methyl or ethyl, but only a maximum of one of the radicals R6, R7 and R8 is methyl, and
• n denotes 1 to 5, and
• the at least one carbodiimide has a number-average molar mass Mn of >1000 to <2000 g/mol, determined by GPC, measured in tetrahydrofuran (THF) against polystyrene as standard
• wherein the film is stable to hydrolysis.