Rear point contact structures for performance enhancement of semi-transparent ultrathin Cu(In,Ga)Se2 solar cells

Semi-transparent ultrathin Cu(In,Ga)Se2 (CIGSe) solar cells offer many promising applications but their efficiencies are still limited. In this work, SiO2 point contact structures were prepared using nanosphere lithography on Sn:In2O3 (ITO) substrate and ultrathin CIGSe solar cells were fabricated on top. It was discovered that the SiO2 point contact structure at the CIGSe/ITO interface behaves significantly different from at the CIGSe/Mo...