Journal
NANO LETTERS
Volume 10, Issue 8, Pages 3041-3046Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl101510q
Keywords
Nanoimprint lithography; soft lithography; optical nanostructures; photovoltaics; silicon; light trapping
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Funding
- Department of Energy through the Materials Research Laboratory (MRL) [DE-FG02-07ER46471]
- Energy Frontier Research Center
- National Science Foundation [DMI-0328162]
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Recently developed classes of monocrystalline silicon solar microcells can be assembled into modules with characteristics (i.e., mechanically flexible forms, compact concentrator designs, and high-voltage outputs) that would be impossible to achieve using conventional, wafer-based approaches. This paper presents experimental and computational studies of the optics of light absorption in ultrathin microcells that include nanoscale features of relief on their surfaces, formed by soft imprint lithography. Measurements on working devices with designs optimized for broad band trapping of incident light indicate good efficiencies in energy production even at thicknesses of just a few micrometers. These outcomes are relevant not only to the microcell technology described here but also to other photovoltaic systems that benefit from thin construction and efficient materials utilization.
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