Towards high-efficiency multi-junction solar cells with biologically inspired nanosurfaces
Article first published online: 2 AUG 2012
Copyright © 2012 John Wiley & Sons, Ltd.
Progress in Photovoltaics: Research and Applications
How to Cite
Yu, P., Chiu, M.-Y., Chang, C.-H., Hong, C.-Y., Tsai, Y.-L., Han, H.-V. and Wu, Y.-R. (2012), Towards high-efficiency multi-junction solar cells with biologically inspired nanosurfaces. Prog. Photovolt: Res. Appl.. doi: 10.1002/pip.2259
- Article first published online: 2 AUG 2012
- Manuscript Accepted: 21 MAY 2012
- Manuscript Revised: 21 DEC 2011
- Manuscript Received: 10 OCT 2011
- National Science Council of Taiwan. Grant Numbers: NSC96-2221-E-009-092-MY3, NSC 98-2112-M-001-022-MY3
- biomimetic nanostructures;
- sub-wavelength structures;
- solar cells;
Multi-junction solar cells offer extremely high power conversion efficiency with minimal semiconductor material usage, and hence are promising for large-scale electricity generation. However, suppressing optical reflection in the UV regime is particularly challenging due to the lack of adequate dielectric materials. In this work, bio-inspired antireflective structures are demonstrated on a monolithically grown Ga0.5In0.5P/In0.01Ga0.99As/Ge triple-junction solar cell, which overcome the limited optical response of reference devices. The fabricated device also exhibits omni-directional enhancement of photocurrent and power conversion efficiency, offering a viable solution to concentrated illumination with large angles of incidence. A comprehensive design scheme is further developed to tailor the reflectance spectrum for maximum photocurrent output of tandem cells. Copyright © 2012 John Wiley & Sons, Ltd.