By a News Reporter-Staff News Editor at Physics Week -- Research findings on Quantum Dots are discussed in a new report. According to news reporting originating from Golden, Colorado, by VerticalNews correspondents, research stated, "We developed a simple non-hot-injection synthetic route that achieves in situ halide-passivated PbS and PbSe quantum dots (QDs) and simplifies the fabrication of Pb-chalcogenide QD solar cells. The synthesis mechanism follows a temperature-dependent diffusion growth model leading to strategies that can achieve narrow size distributions for a range of sizes."
Our news editors obtained a quote from the research from National Renewable Energy Laboratory, "We show that PbS QDs can be produced with a diameter as small as 2.2 nm, corresponding to a 1.7 eV band gap, while the resulting size distribution (6-7%) is comparable to that of hot-injection syntheses. The in situ chloride surface passivation is demonstrated by X-ray photoelectron spectroscopy and an improved photostability of both PbS and PbSe QDs when stored under air. Additionally, the photoluminescence quantum yield of the PbS QDs is similar to 30% higher compared to the traditional synthesis. We show that PbS QD solar cells with 65% power conversion efficiency (PCE) can be constructed."
According to the news editors, the research concluded: "Finally, we fabricated PbSe QD solar cells in air (rather than in inert atmosphere), achieving a PCE of 2.65% using relatively large QDs with a corresponding band gap of 0.89 eV."
For more information on this research see: Diffusion-Controlled Synthesis of PbS and PbSe Quantum Dots with in Situ Halide Passivation for Quantum Dot Solar Cells. ACS Nano, 2014;8(1):614-622. ACS Nano can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; ACS Nano - www.pubs.acs.org/journal/ancac3)
The news editors report that additional information may be obtained by contacting J.B. Zhang, Natl Renewable Energy Lab, Chem & Mat Sci Center, Golden, CO 80401, United States. Additional authors for this research include J.B. Gao, E.M. Miller, J.M. Luther and M.C. Beard.
Keywords for this news article include: Golden, Colorado, Quantum Dots, United States, Nanotechnology, Quantum Physics, Emerging Technologies, North and Central America
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