期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 113, 期 -, 页码 37-43出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2013.01.037
关键词
Industrial monocrystalline silicon solar cell; Alkaline texturing; Potassium silicate additive; Bath lifetime; Weighted average reflectance
资金
- National University of Singapore (NUS)
- Singapore's National Research Foundation (NRF) through the Singapore Economic Development Board (EDB)
An improved texturing process is reported for industrial monocrystalline silicon wafers, which uses a small amount of liquid potassium silicate as an additive to the conventional KOH/IPA texturing process. The new silicate additive does not require any other changes to the chemical components and thus can easily be integrated into the standard industrial process. Reflectivity and scanning electron microscope studies confirm that the new process yields smaller pyramidal structures of about 4-6 mu m in height, with an improved uniformity across the entire Si surface resulting in a low solar weighted average reflectance (WAR) in the range 11.4-12.2%. Moreover a near three-fold decrease in IPA consumption and a six-fold increase in bath lifetime are achieved by the new texturing process compared to the standard texturing process. For 156 mm x 156 mm pseudo-square CZ monocrystalline p-type silicon wafers cell efficiencies of over 18% are achieved with the new texturing process on industrial-grade, screen-printed solar cells fabricated on SERIS' industrial R&D pilot line. This process offers the potential for significant cost reduction in manufacturing of monocrystalline silicon wafer solar cells. (C) 2013 Elsevier B.V. All rights reserved.
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