Structural Defects in Silicon Web Dendrite and Their Effects on Solar Cell Efficiency: Annual Subcontract Report, 1 April 1985-31 March 1986

摘要

This report presents results of research on the differences between silicon web dendrite material yielding low (8%) and high (greater than or equal to 15%) solar cell efficiencies. The proven advantages of silicon web for larger than 15% efficient solar cells are reinforced through new findings. It is shown that excellent silicon web dendrite sheets are produced if favorable growth conditions exist during the growth process. Correlation of results obtained through transmission x-ray toography, transmission electron microscopy, high-resolution electron microscopy, electron-beam-induced current, and solar cell measurements has established that silicon web dendrite is the leading sheet material to date. Silicon web could be used for solar cells with an ultimate efficiency of 20% or better. Current web dendrite crystal growth technology produces web material of varying properties yields solar cell efficiencies between 8% to 18%. (ERA citation 12:030319)