We have demonstrated superstrate type nano-structured solar cells with ZnSe/ZnO coaxial NWs embedded in the CuInSe2 (CIS) layer. Complete filling of the CIS film into the narrow spaces between the ZnO NWs was realized by growing the NWs sparsely. The ZnSe/CIS heterojunction was self-formed by converting a skin (∼50 nm) layer of ZnO after the selenization. The influences of the NW length and density on light trapping and on cell conversion efficiency have been investigated. A 30 improvement in Jsc and higher efficiency has been achieved by embedding NWs in the CIS layer. Conversion efficiency of 1.79 was obtained from a ZnSe/CIS heterojunction solar cell fabricated on sparse ZnO NWs with Voc 599 mV, Jsc 11.60 mA/cm2 and 25.71 fill factor.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Electronic, Optical and Magnetic Materials
- Materials Chemistry
- Surfaces, Coatings and Films
- Condensed Matter Physics