4.4. Metal/semiconductor contacts
Metal/semiconductor contacts on the front and back surface of a solar cell cause losses. The front contact is thin grid lines and back contact is a metallic coating. Reduction of resistance of the metal/semiconductor contact is one of the major means to decrease the power losses for cell [28].
These losses affect the efficiency of thin film solar cell; therefore it is necessary to reduce these losses in order to increase the efficiency of the solar cell. Various methods used for reducing these losses are discussed below.