Journal
JOURNAL OF POWER SOURCES
Volume 266, Issue -, Pages 138-144Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.04.150
Keywords
a-Si:H/mu c-Si:H Tandem solar cell; Light trapping; ZnO:Al substrate; Long wavelength light; Intermediate reflector
Funding
- National Basic Research Program of China [2011CBA00706]
- National Natural Science Foundation of China [60976051]
- Science and Technology Support Program in Tianjin [12ZCZDGX03600]
- Major Science and Technology Support Project of Tianjin City [11TXSYGX22100]
- Specialized Research Fund for the PhD Program of Higher Education [20120031110039]
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A simulated and experimental investigation of the trade-off between light trapping and current matching in p-i-n structured a-Si:H/mu c-Si:H tandem solar cells is presented, which aims to address the limited short circuit current density (J(sc)) that results from the low long-wavelength light scattering of the fluorine-doped tin oxide (SnO2:F) substrates typically used. To this end, the mismatch of the J(sc) between the top and bottom cells is reduced by utilizing a ZnO:Al substrate with optimized long-wavelength light scattering properties as the front contact, thereby improving the response of the bottom cell at the expense of the lower top cell's j(sc) yet. A trade-off between the top and bottom cell's light response is subsequently found with SnO2 or ZnO:Al as a substrate, by introducing an n-type mu C-SiOx intermediate reflector (IR) between the two component cells. An initial efficiency based on an approximate current matching of 11.90% is achieved for a-Si:H/mu c-Si:H tandem solar cell by adopting a magnetron-sputtered and texture-etched ZnO:Al substrate and an optimized n-type mu C-SiOx IR. (C) 2014 Elsevier B.V. All rights reserved.
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