1 Department of Micro- and Nanotechnology, Technical University of Denmark2 Silicon Microtechnology, Department of Micro- and Nanotechnology, Technical University of Denmark3 Nanoprobes, Department of Micro- and Nanotechnology, Technical University of Denmark4 Department of Physics, Technical University of Denmark5 Experimental Surface and Nanomaterials Physics, Department of Physics, Technical University of Denmark6 Institute for Energy Technology7 Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics, Center, Technical University of Denmark
We report on an experimental study of nanostructuring of silicon solar cells using reactive ion etching (RIE). A simple mask-less, scalable RIE nanostructuring of the solar cell surface is shown to reduce the AM1.5-weighted average reflectance to a level below 1 % in a fully optimized RIE texturing, and thus holds a significant potential for improvement of the cell performance compared to current industrial standards. The reflectance is shown to remain below that of conventional textured cells also at high angle of incidence. The process is shown to be equally applicable to mono-, multi- and quasi-mono-crystalline Si. The process was successfully integrated in fabrication of solar cells using only industry standard processes on a Czochralski (CZ) silicon starting material. The resulting cell performance was compared to cells with conventional texturing. For cells, where the nanostructuring was not fully optimized (reflectance larger than 2 %), an efficiency of 16.5 % at 1 sun was demonstrated.
Proceedings for Eu Pvsec 2013, 2013
Anti-reflective coating; C-Si; Czochralski; Multicrystalline; Silicon; Solar cell efficiency; Texturisation
Main Research Area:
28th European PV Solar Energy Conference and Exhibition (EU PVSEC 2013)