NANO-IMPRINT TECHNOLOGY COMBINED WITH ROUGH TCO MORPHOLOGY AS DOUBLE TEXTURED LIGHT-TRAPPING SUPERSTRATE FOR THIN FILM SOLAR CELLS

Two types of nano-imprinted 2D grating textures were tested on their light trapping performance for thin film Si tandem solar cells in combination with various TCO’s. The combination with rough TCO layers like LPCVD ZnO leads to double textured superstrates that exhibit at least a similar light trapping capability as the state-of-the-art reference while using thinner TCO layers. Further optimization in combination with nano-imprinted AR textures on the air/glass interface has the potential for >13% devices with thin TCO and absorber layers

Design of advanced surface-textures for thin-film silicon micromorph solar cells

Improvements in short-circuit currents of micromprph solar cells are investigated, with respect of nano-imprinted textures to glass superstrate. 2-D U-like periodic textures are optimized by means of 3-D rigorous optical simulations. Simulations indicate potential for > 35 % improvements in JSCbot for the optimized U-like textures with high aspect ratio compared to state-of-the-art random textures

2-D Periodic and Random-on-Periodic Front Textures for Tandem Thin-Film Silicon Solar Cells

We evaluate the performance of thin-film silicon micromorph tandem solar cells deposited on transparent superstrates with embossed micrometer-scale 2-D gratings. Once coated with a thin conductive layer of hydrogenated indium oxide, the textured superstrates can be used as 2-D periodic single-texture front electrodes. Combining these almost loss-free front electrodes with a highly transparent, random self-textured zinc oxide layer (with a thickness 1 um) deposited by low-pressure chemical vapor deposition (LPCVD), we obtain double-texture transparent front electrodes. The potential of both single- and double-texture front electrodes is estimated by varying the illumination spectrum of the solar simulator, thereby assessing the maximum efficiency of the tandem cells under optimal current-matching conditions. Our results demonstrate the complementary roles of the 2-D gratings and the LPCVD-ZnO layers in double textures: Cell efficiencies as high as with our state-of-the-art 2.3-um-thick LPCVD-ZnO front electrode are obtained with significantly reduced ZnO layer thicknesses. Additionally, we show that equivalent efficiencies are also within reach with 2-D periodic single textures if the proper cell configuration is applied

swcarpentry/shell-novice: Software Carpentry: the UNIX shell, June 2019

Software Carpentry lesson on how to use the shell to navigate the filesystem and write simple loops and scripts