Journal
NANO LETTERS
Volume 15, Issue 1, Pages 523-529Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl503870u
Keywords
Nanowire; minority carrier diffusion length; surface effect; scanning photocurrent microscopy
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Funding
- NSF [DMR-1310678, CMMI-1235592]
- Laboratory Directed Research and Development Program at Sandia National Laboratories
- United States Department of Energy [DEAC01-94-AL85000]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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Nanowires have large surface areas that create new challenges for their optoelectronic applications. Lithographic processes involved in device fabrication and substrate interfaces can lead to surface defects and substantially reduce charge carrier lifetimes and diffusion lengths. Here, we show that using a bridging method to suspend pristine nanowires allows for circumventing detrimental fabrication steps and interfacial effects associated with planar device architectures. We report electron diffusion lengths up to 2.7 mu m in bridged silicon nanowire devices, much longer than previously reported values for silicon nanowires with a diameter of 100 nm. Strikingly, electron diffusion lengths are reduced to only 45 nm in planar devices incorporating nanowires grown under the same conditions. The highly scalable silicon nanobridge devices with the demonstrated long diffusion lengths may find exciting applications in photovoltaics, sensing, and photodetectors.
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