A polycarbonate film having a thickness of 0.05 mm to 0.25 mm is formed from a thermoplastic composition that includes a first branched polycarbonate that has a peak melt viscosity of at least 7,000 poise when measured using a parallel plate melt rheology test at a heating rate of 10° C./min at a temperature of between 350° C. to 450° C., a second branched polycarbonate, and a perfluoroalkyl sulfonate salt.