A thin-film photovoltaic solar cell device is disclosed. A transparent conductive oxide (TCO) layer is disposed on a substrate as a front contact. A window layer is disposed on the TCO layer. A metal oxide layer is disposed on the window layer. An absorber layer is disposed on the metal oxide layer. A back contact layer is disposed on the absorber layer. In one embodiment, the device includes a high resistance barrier (HRT) layer interposed between the window layer and the TCO layer.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 The invention was made with Government support under Contract DE-AC-05-RL01830, awarded by the U.S. Department of Energy. The Government has certain rights in the invention.