NDLI: Antireflection and SiO surface passivation by liquid-phase chemistry for efficient black silicon solar cells

Content Provider	IEEE Xplore Digital Library
Author	Hao-Chih Yuan Jihun Oh Yuanchang Zhang Kuznetsov, O.A. Flood, D.J. Branz, H.M.
Copyright Year	2012
Description	Author affiliation: National Renewable Energy Laboratory, Golden, CO, USA (Hao-Chih Yuan; Jihun Oh; Branz, H.M.) \|\| Natcore Technology, Red Bank, NJ, USA (Yuanchang Zhang; Kuznetsov, O.A.; Flood, D.J.)
Abstract	We report solar cells with both black Si antireflection and SiO surface passivation provided by inexpensive liquid-phase chemistry, rather than by conventional vacuum-based techniques. The best cell efficiency from our first efforts was 16.4%. Nanoporous black Si antireflection on crystalline Si by aqueous etching promises low surface reflection for high photon utilization, together with lower manufacturing cost compared to vacuum-based antireflection coating. Agn-anoparticle-assisted black Si etching and post-etching chemical treatment recently developed at NREL enables excellent control over the pore diameter and pore separation. Performance of black Si solar cells, including open-circuit voltage, short-circuit current density, and blue response, has benefited from these improvements. Prior to this study, our black Si solar cells were all passivated by thermal SiO produced in a tube furnace. Although this passivation is effective, it is not ideal for ultra-low-cost manufacturing. In this study, we report, for the first time, the integration of black Si with a proprietary liquid-phase deposition (LPD) passivation from Natcore Technology. The Natcore LPD forms a layer of <10-nm SiO on top of the black Si surface in a relatively mild chemical bath at room temperature. We demonstrate black Si solar cells with LPD SiO with a spectrum-weighted average reflection lower than 5%, similar to the more costly thermally grown SiO approach. However, LPD SiO provides somewhat better surface-passivation quality according to the lifetime analysis by the photo-conductivity decay measurement. Moreover, black Si solar cells with LPD SiO passivation exhibit higher spectral response at short wavelength compared to those passivated by thermally grown SiO. With further optimization, the combination of aqueous black Si etching and LPD could provide a pathway for low-cost, high-efficiency crystalline Si solar cells.
Starting Page	000686
Ending Page	000689
File Size	792622
Page Count	4
File Format	PDF
ISBN	9781467300643
ISSN	01608371
e-ISBN	9781467300667
DOI	10.1109/PVSC.2012.6317702
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Silicon Photovoltaic cells Etching Passivation Reflectivity Surface waves photovoltaic cells black silicon metal-assisted porous silicon etching antireflection liquid-phase deposition surface passivation
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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