Ag Nanowire @ Nano-groove Fabrication for Enhanced Light Harvesting Through Silicon Chemical Etching
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Chemical etching was employed to fabricate Ag nanowire @ nano-grooves on silicon to increase light harvesting. Ag nanowire @ nano-groove structures (300 nm to 1.7 μm in size) were obtained by controlling the etching time. A significant increase in the surface roughness was achieved around the Ag nanowire @ grooves with an etching time of 10–30 min. According to finite difference time domain simulations, a significant increase in both the light intensity and light path length were observed with the Ag nanowire @ nano-groove nano-structures on the silicon substrate. Increasing the opening sizes of the grooves to ~ 255 nm and the roughness of the Ag nanowire and groove surface to ~ 30 nm further enhanced the light harvesting abilities. This work not only provides a deeper insight into metal assisted silicon etching, but also indicates a possible way to enhance the light harvesting abilities of thin film solar cells.
KeywordsAg nanowire Chemical etching Nano-groove Light harvesting
This work was supported by grants from the Natural Science Foundation of Shandong Province, China (Nos. ZR2017PEM005 and ZR2017MEM005), Project of Scientific Research Development of Shandong Universities China (Nos. J17KA043 and J17KB076), and 2015 Shandong Province Project of Outstanding Subject Talent Group.