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All-star nanocrystals

Tiny semiconducting crystals show promise for solar cell architectures and light-emitting devices

Date:
June 12, 2015
Source:
Department of Energy, Office of Science
Summary:
Scientists have created perovskite nanocrystals that are stable light emitters and stellar light-to-energy converters.
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Perovskite nanowires have been found to function as shape-correlated stable light emitters.
Credit: Image courtesy of The Ames Laboratory

Ames Laboratory scientists discovered semiconducting nanocrystals that function not only as stellar light-to-energy converters but also as stable light emitters.

Honing methods to fine-tune optimal characteristics of materials that convert light to energy may lead to more efficient materials, as performance depends critically on composition, crystallinity, and morphology. These perovskites could be used in the construction of new solar cell architectures, as well as for light-emitting devices and single particle imaging and tracking.

Perovskite materials, such as CH3NH3PbX3 (X = I, Br), are known to display intriguing electronic, light-emitting, and chemical properties. Researchers at the Ames Laboratory synthesized a series of perovskite nanocrystals with different morphologies (i.e., dots, rods, wires, plates, and sheets) by using different solvents and capping ligands. The Ames Laboratory team tested the nanocrystals to explore their morphology, growth, properties, and stability under various conditions. Characterization studies of photoluminescence, like that seen with glow-in-the-dark paint, found that the rods and wires showed higher photoluminescence and longer photoluminescence lifetimes compared to other shapes. Perovskite nanocrystals with bromine were found to be particularly unstable when exposed to an electron beam during transmission electron microscopy analysis, "melting" to form smaller dot-like particles of unknown composition. Further optical studies revealed that the nanocrystals with iodine are shape-correlated stable light emitters at room temperature.

This research is supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and Biosciences, Separations and Analysis Program through the Ames Laboratory. The Ames Laboratory is operated for DOE by Iowa State. This work was performed, in part (AFM/PL), at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the DOE Office of Science. Los Alamos National Laboratory is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of DOE.


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Materials provided by Department of Energy, Office of Science. Note: Content may be edited for style and length.


Journal Reference:

  1. Feng Zhu, Long Men, Yijun Guo, Qiaochu Zhu, Ujjal Bhattacharjee, Peter M. Goodwin, Jacob W. Petrich, Emily A. Smith, Javier Vela. Shape Evolution and Single Particle Luminescence of Organometal Halide Perovskite Nanocrystals. ACS Nano, 2015; 9 (3): 2948 DOI: 10.1021/nn507020s

Cite This Page:

Department of Energy, Office of Science. "All-star nanocrystals: Tiny semiconducting crystals show promise for solar cell architectures and light-emitting devices." ScienceDaily. ScienceDaily, 12 June 2015. <www.sciencedaily.com/releases/2015/06/150612090621.htm>.
Department of Energy, Office of Science. (2015, June 12). All-star nanocrystals: Tiny semiconducting crystals show promise for solar cell architectures and light-emitting devices. ScienceDaily. Retrieved May 23, 2017 from www.sciencedaily.com/releases/2015/06/150612090621.htm
Department of Energy, Office of Science. "All-star nanocrystals: Tiny semiconducting crystals show promise for solar cell architectures and light-emitting devices." ScienceDaily. www.sciencedaily.com/releases/2015/06/150612090621.htm (accessed May 23, 2017).

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