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Researchers' Work from Huazhong University of Science and Technology Focuses on Quantum Dots (Air-stable n-type colloidal quantum dot solids)

August 29, 2014



By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Quantum Dots. According to news reporting originating in Hubei, People's Republic of China, by NewsRx journalists, research stated, "Colloidal quantum dots (CQDs) offer promise in flexible electronics, light sensing and energy conversion. These applications rely on rectifying junctions that require the creation of high-quality CQD solids that are controllably n-type (electron-rich) or p-type (hole-rich)."

The news reporters obtained a quote from the research from the Huazhong University of Science and Technology, "Unfortunately, n-type semiconductors made using soft matter are notoriously prone to oxidation within minutes of air exposure. Here we report high-performance, air-stable n-type CQD solids. Using density functional theory we identify inorganic passivants that bind strongly to the CQD surface and repel oxidative attack. A materials processing strategy that wards off strong protic attack by polar solvents enabled the synthesis of an air-stable n-type PbS CQD solid. This material was used to build an air-processed inverted quantum junction device, which shows the highest current density from any CQD solar cell and a solar power conversion efficiency as high as 8%. We also feature the n-type CQD solid in the rapid, sensitive, and specific detection of atmospheric NO2."

According to the news reporters, the research concluded: "This work paves the way for new families of electronic devices that leverage air-stable quantum-tuned materials."

For more information on this research see: Air-stable n-type colloidal quantum dot solids. Nature Materials, 2014;13(8):822-828. Nature Materials can be contacted at: Nature Publishing Group, Macmillan Building, 4 Crinan St, London N1 9XW, England. (Nature Publishing Group - www.nature.com/; Nature Materials - www.nature.com/nmat/)

Our news correspondents report that additional information may be obtained by contacting Z.J. Ning, Huazhong University of Science & Technology, Wuhan Natl Lab Optoelect, Wuhan 430074, Hubei, People's Republic of China. Additional authors for this research include O. Voznyy, J. Pan, S. Hoogland, V. Adinolfi, J.X. Xu, M. Li, A.R. Kirmani, J.P. Sun, J. Minor, K.W. Kemp, H.P. Dong, L. Rollny, A. Labelle, G. Carey, B. Sutherland, I. Hill, A. Amassian, H. Liu, J. Tang, O.M. Bakr and Sargent (see also Quantum Dots).

Keywords for this news article include: Asia, Hubei, Quantum Dots, Nanotechnology, Emerging Technologies, People's Republic of China

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Science Letter


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