Journal
OPTICS EXPRESS
Volume 23, Issue 11, Pages A614-A624Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.00A614
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Funding
- National Science Council of Taiwan [NSC102-2221-E-002-174, NSC102-2120-M-110-005]
- Excellent Research Projects of National Taiwan University [104R89085]
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Optical design in enhancing optical absorption of group-III-nitride- and multiple quantum well-based GaN/InxGa1-xN/cSi dual-junction tandem solar cells with triangular diffraction grating is simulated and optimized by using combined two-dimensional rigorous coupled wave analysis and transfer matrix methods. This paper thoroughly examines these phenomena of optical absorption affected by antireflection coatings, multiple thin-film layers and diffraction gratings with the integrated perspectives of semiconductor physics and electromagnetic theory for the first time. An improvement of 58% in absorption compared to the prototype SC is obtained which means more than 80% of incoming light (h upsilon > Eg(Si)) can be harvested in this thin-film (< 4 mu m in total) design. (C) 2015 Optical Society of America
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