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Published October 2011 | Supplemental Material
Journal Article Open

Optimized Spatial Correlations for Broadband Light Trapping Nanopatterns in High Efficiency Ultrathin Film a-Si:H Solar Cells


Nanophotonic structures have attracted attention for light trapping in solar cells with the potential to manage and direct light absorption on the nanoscale. While both randomly textured and nanophotonic structures have been investigated, the relationship between photocurrent and the spatial correlations of random or designed surfaces has been unclear. Here we systematically design pseudorandom arrays of nanostructures based on their power spectral density, and correlate the spatial frequencies with measured and simulated photocurrent. The integrated cell design consists of a patterned plasmonic back reflector and a nanostructured semiconductor top interface, which gives broadband and isotropic photocurrent enhancement.

Additional Information

© 2011 American Chemical Society. Received: July 1, 2011. Revised: August 23, 2011. Published: August 29, 2011. We are grateful to Karine van der Werf for solar cell depositions, to MiPlaza for electron-beam fabrication of the master pattern, and to Michael Kelzenberg, Krista Langeland, Imogen Pryce, Piero Spinelli, Robert Walters, Jorik van der Groep, and David Valley for useful discussions and assistance with the manuscript. The Caltech portion of this work was supported by the Department of Energy under contract number DE-FG02- 07ER46405 (modeling) and SETP GO-18006 (cell fabrication). Work at AMOLF is part of the research program of FOM that is financially supported by NWO. This work is also part of the Global Climate and Energy Project (GCEP).

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