Researchers demonstrated a performance improvement of state-of-the-art silicon solar cells by cloaking their metal contact fingers. The cloaking free-form surfaces are fabricated on silicon heterojunction solar cells using direct laser writing of polymers and subsequent soft imprinting. Cloaking performance is determined experimentally by measuring spatially resolved and angle-resolved current generation and the spectral response of the cell. The short-circuit current density of the cell increases by 7.3%; its power-conversion efficiency is enhanced by 9.3%. Overcompensation of the shadowing loss is found to be caused by improved light-gathering and light-trapping in the polymer layer. The experimental findings are in good agreement to ray-tracing simulations.
Brian Wang is a Futurist Thought Leader and a popular Science blogger with 1 million readers per month. His blog Nextbigfuture.com is ranked #1 Science News Blog. It covers many disruptive technology and trends including Space, Robotics, Artificial Intelligence, Medicine, Anti-aging Biotechnology, and Nanotechnology.
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