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. 2019 Aug 28;9:12482. doi: 10.1038/s41598-019-48981-w

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Contact width optimization of inverted pyramid photonic crystal IBC cell with design parameters specified in Table 3. (a) For contact SRV = 10 cm/s, the optimum base and emitter contact widths are 140 μm and 10 μm, respectively. (b) For contact SRV = 100 cm/s, the optimum width of the base contact is reduced to 110 μm and the cell efficiency exhibits a drop of 0.25% (additive).