Effect of Rapid Thermal Processing on the structural and device properties of (Ag,Cu)(In,Ga)Se2 thin film solar cells

► Rapid Thermal Processing (RTP) of (Ag,Cu)(In,Ga)Se2 alloy films was investigated. ► It was found that RTP with excess Se supply improves solar cell properties. ► RTP with excess Se eliminated (Ag,Cu)(In,Ga)5Se8 phases. ► RTP with excess Se also reduced group I elements at the film surfaces.