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Optical Absorption Enhancement in Amorphous Silicon Nanowire and Nanocone Arrays
Abstract
Hydrogenated amorphous Si (a-Si:H) is an important solar cell material. Here we demonstrate the fabrication of a-Si:H nanowires (NWs) and nanocones (NCs), using an easily scalable and IC-compatible process. We also investigate the optical properties of these nanostructures. These a-Si:H nanostructures display greatly enhanced absorption over a large range of wavelengths and angles of incidence, due to suppressed reflection. The enhancement effect is particularly strong for a-Si:H NC arrays, which provide nearly perfect impedance matching between a-Si:H and air through a gradual reduction of the effective refractive index. More than 90% of light is absorbed at angles of incidence up to 60 degrees for a-Si:H NC arrays, which is significantly better than NW arrays (70%) and thin films (45%). In addition, the absorption of NC arrays is 88% at the band gap edge of a-Si:H, which is much higher than NW arrays (70%) and thin films (53%). Our experimental data agree very well with simulation. The a-Si:H nanocones function as both absorber and antireflection layers, which offer a promising approach to enhance the solar cell energy conversion efficiency.
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Citations
Cited by
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Wang, Z. L., & Wu, W. (2012) · Angewandte Chemie International Edition · doi:10.1002/anie.201201656 · Cited by 1,063
Nanodome Solar Cells with Efficient Light Management and Self-Cleaning
Zhu, J., Hsu, C.-M., Yu, Z., Fan, S., & Cui, Y. (2010) · Nano Letters · doi:10.1021/nl9034237 · Cited by 873
Self-citationZhang, J., Li, Y., Zhang, X., & Yang, B. (2010) · Advanced Materials · doi:10.1002/adma.201000755 · Cited by 649
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Savin, H., Repo, P., von Gastrow, G., Ortega, P., Calle, E., Garín, M., & Alcubilla, R. (2015) · Nature Nanotechnology · doi:10.1038/nnano.2015.89 · Cited by 586
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Metadata
- Authors
- Zhu, J., Yu, Z., Burkhard, G. F., Hsu, C.-M., Connor, S. T., Xu, Y., Wang, Q., McGehee, M., Fan, S., & Cui, Y.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2009-01-14
- Volume
- 9
- Issue
- 1
- Pages
- 279-282
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2152451116
- Cited by
- 1,294
- References
- 0
- FWCI
- 69.63
- Type
- journal article
- Language
- en
- Open access
- closed
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- Zhu, J., Yu, Z., Burkhard, G. F., Hsu, C.-M., Connor, S. T., Xu, Y., Wang, Q., McGehee, M., Fan, S., & Cui, Y. (2009). Optical Absorption Enhancement in Amorphous Silicon Nanowire and Nanocone Arrays. Nano Letters. https://doi.org/10.1021/nl802886y
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