  We explore the role of charge reservoir layers (CRLs) on the superconducting
transition temperature of cuprate superconductors. Specifically, we study the
effect of CRLs with efficient short distance dielectric screening coupled
capacitively to copper oxide metallic layers. We argue that dielectric
screening at short distances and at frequencies of the order of the
superconducting gap, but small compared to the Fermi energy can significantly
enhance T$_c$, the transition temperature of an unconventional superconductor.
We discuss the relevance of our qualitative arguments to a broader class of
unconventional superconductors.
