The invention relates to a double-layer thermoplastic film of a photovoltaic module, comprising two layers, one of which forms the encapsulator (22) and the other forms the backsheet (26), the encapsulator-backsheet set (22, 26) having a thickness of more than 100 µm (micrometre), characterised in that: a) the encapsulator (22) consists of a layer comprising between 0% and 100% of at least one polyolefin containing a polyethylene selected from a homopolymer of ethylene or a copolymer comprising at least 50 mol % of ethylene and at least one comonomer; and between 0% and 100% of a polyamide grafted polymer comprising a polyolefin trunk that represents between 50 mass % and 95 mass % of the polyamide grafted polymer containing a radical of at least one unsaturated monomer (X) and at least one polyamide graft that represents between 5 mass % and 50 mass % of said polyamide grafted polymer; and b) the backsheet (26) comprises a layer formed from a polyamide grafted polymer that is identical to that of the encapsulator except that it has a flow temperature higher than 160°C. The invention also relates to a photovoltaic module incorporating such a film and to the use of said film for the same purposes.