Journal
IEEE JOURNAL OF PHOTOVOLTAICS
Volume 7, Issue 2, Pages 493-501Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2016.2641298
Keywords
Light management; periodic nanostructures; ultrathin silicon solar cells
Funding
- National University of Singapore Graduate School for Integrative Sciences and Engineering
- National University of Singapore
- Singapore's National Research Foundation through the Singapore Economic Development Board
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Motivated by the primary benefit of reduced material cost, the thickness of crystalline silicon solar cells has been continuously reduced. Laboratory and industrial studies have explored ultrathin crystalline silicon solar cells below 50 mu m with ambitious endeavors toward thicknesses of only a few micrometers. Ultrathin crystalline silicon solar cells require compatible small-scale surface textures to enhance the optical absorption. For this purpose, a novel submicron periodic nanostructure-periodic upright nanopyramids (PuNPs)-is fabricated by an integrated process of laser interference lithography and anisotropic etching of silicon in an alkaline solution. By simulation and measurements, we demonstrate that PuNPs are able to reduce front surface reflectance more effectively than conventional micron-scale pyramid textures and previously investigated periodic inverted nanopyramids (PiNPs). With a silicon nitride antireflection coating, we predict that PuNPs reduce the front surface reflectance to below 1% at an angle of incidence of 8 degrees, which is comparable to black silicon. The superior antireflective property of PuNPs contributes to an absorbed photocurrent density of 40.8 mA/cm(2) for a 40 mu m silicon absorber layer, which is 0.7 mA/cm(2) higher than PiNPs, 0.8 mA/cm(2) higher than inverted pyramids and 1 mA/cm(2) higher than upright pyramids.
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