Description: In this Phase I SBIR effort, Structured Materials Industries, Inc. (SMI)will design, fabricate, and test more efficient photovoltaics for 1.06 micron wavelength wireless power transmission (WPT) systems. The need for such photovoltaics is well understood by SMI and builds upon our exiting WPT efforts, which have highlighted the requirement for efficient, cost-effective, and thin-able photovoltaics with a peak absorption matched to the output of available high power Nd:YAG lasers at 1.06 microns. The proposed work will address this need by developing SiGe photocells to help enable WPT implementation for both ground based and space based applications.