文章基本信息

标题：Two- and three-dimensional folding of thin film single-crystalline silicon for photovoltaic power applications
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作者：Xiaoying Guo ; Huan Li ; Bok Yeop Ahn 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2009
卷号：106
期号：48
页码：20149-20154
DOI：10.1073/pnas.0907390106
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Fabrication of 3D electronic structures in the micrometer-to-millimeter range is extremely challenging due to the inherently 2D nature of most conventional wafer-based fabrication methods. Self-assembly, and the related method of self-folding of planar patterned membranes, provide a promising means to solve this problem. Here, we investigate self-assembly processes driven by wetting interactions to shape the contour of a functional, nonplanar photovoltaic (PV) device. A mechanics model based on the theory of thin plates is developed to identify the critical conditions for self-folding of different 2D geometrical shapes. This strategy is demonstrated for specifically designed millimeter-scale silicon objects, which are self-assembled into spherical, and other 3D shapes and integrated into fully functional light-trapping PV devices. The resulting 3D devices offer a promising way to efficiently harvest solar energy in thin cells using concentrator microarrays that function without active light tracking systems.
关键词：3D structure ; microfabrication ; self-folding ; photovoltaics ; capillary force