Direct current-voltage measurements of the Mo/CuInSe/sub 2/ contact on operating solar cells

Abstract
Many high efficiency CuInSe/sub 2/ based solar cells show blocking or nonohmic contact behavior in their current-voltage characteristic which has often been attributed to the Mo/CuInSe/sub 2/ back contact. A novel device configuration is presented which allows the current-voltage characteristic of the Mo/CuInSe/sub 2/ junction to be analyzed separately from the rest of the operating solar cell. Direct measurements of the back contact on operating CuInSe/sub 2/ based solar cells which demonstrate this blocking behavior show that the Mo/CuInSe/sub 2/ contact is ohmic with negligible contact resistance compared to the total series resistance of the device.