期刊
MATERIALS RESEARCH BULLETIN
卷 48, 期 2, 页码 352-356出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2012.10.044
关键词
Nanostructures; Thin films; Sputtering; Epitaxial growth; Microstructure
资金
- U.S. Department of Energy, Office of Electricity Delivery and Energy Reliability, Advanced Cables and Conductors program
- U.S. Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
- Laboratory Directed Research and Development Program of Oak Ridge National Laboratory
- ORISE postdoctoral fellowship
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
Significant efforts are being devoted to the development of multifunctional thin-film heterostructures and nanostructured material architectures for components with novel applications of superconductivity, multiferroicity, solar photocatalysis and energy conversion. In particular, nanostructured assemblies with well-defined geometrical shapes have emerged as possible high efficiency and economically viable alternatives to planar photovoltaic thin-film architectures. By exploiting phase-separated self-assembly, here we present advances in a vertically oriented two-component system that offers potential for future development of nanostructured thin film solar cells. Through a single-step deposition by magnetron sputtering, we demonstrate growth of an epitaxial, composite film matrix formed as self-assembled, well ordered, phase segregated, and oriented nanopillars of n-type TiO2 and p-type Cu2O. The composite films were structurally characterized to atomic resolution by a variety of analytical tools, and evaluated for preliminary optical properties using absorption measurements. We find nearly atomically distinct TiO2-Cu2O interfaces (i.e., needed for possible active p-n junctions), and an absorption profile that captures a wide range of the solar spectrum extending from ultraviolet to visible wavelengths. This high-quality materials system could lead to photovoltaic devices that can be optimized for both incident light absorption and carrier collection. Published by Elsevier Ltd.
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