Thin films of the electron-doped superconductor Ndl.85Ceo.15CuO4_y (NCCO) have been fabricated on (100) SrTiO3 substrates by inverted cylinder magnetron sputtering. By optimizing the reduction step subsequent to the deposition, superconducting thin films with a transition temperature Tc(R = 0) = 22.5 K and zero-field critical current density Jc = 1.7 × l0 n A/cm 2 at T= 4.2 K could be obtained. Also, epitaxial YBCO/NCCO bilayers in which both materials are superconducting could be fabricated. The mixed state of the NCCO films has been characterized by measuring the longitudinal resistivity as well as the Nernst and Seebeck effects in magnetic fields up to 6 T applied parallel to the c-axis. From these measurements an upper critical field slope dB~2/dT= -0.35 T/K was obtained for films with Tc = 22 K corresponding to an ab-plane coherence length ~,,i, = 80 ~. The transport energy of magnetic flux lines was derived to dUJdT= -2.4 × 10-~3 J/K m. The transport entropy of magnetic flux lines was obtained to S,~ = 1.6 × 10-~4 J/K m at T= 18 K and B = 0.5 T in good agreement with the prediction of timedependent Ginzburg-Landau theory.