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Start Over Author "Zhao, Haiguang" Journal advanced energy materials
8 results on '"Zhao, Haiguang"'

5. Ultrasmall Nanoplatelets: The Ultimate Tuning of Optoelectronic Properties

Author

Zhou, Yufeng, primary, Celikin, Mert, additional, Camellini, Andrea, additional, Sirigu, Gianluca, additional, Tong, Xin, additional, Jin, Lei, additional, Basu, Kaustubh, additional, Barba, David, additional, Ma, Dongling, additional, Sun, Shuhui, additional, Vidal, François, additional, Zavelani‐Rossi, Margherita, additional, Wang, Zhiming M., additional, Zhao, Haiguang, additional, Vomiero, Alberto, additional, and Rosei, Federico, additional

Published
2017
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8. Near‐Infrared, Heavy Metal‐Free Colloidal “Giant” Core/Shell Quantum Dots.

Author

Tong, Xin, Kong, Xiang‐Tian, Zhou, Yufeng, Navarro‐Pardo, Fabiola, Selopal, Gurpreet Singh, Sun, Shuhui, Govorov, Alexander O., Zhao, Haiguang, Wang, Zhiming M., and Rosei, Federico

Subjects
OPTOELECTRONICS, QUANTUM dots, HEAVY metals, COLLOIDS, STRUCTURAL shells, COPPER compounds
Abstract

Abstract: “Giant” core/shell quantum dots (g‐QDs) are a promising class of materials for future optoelectronic technologies due to their superior chemical‐ and photostability compared to bare QDs and core/thin shell QDs. However, inadequate light absorption in the visible and near‐infrared (NIR) region and frequent use of toxic heavy metals (e.g., Cd and Pb) are still major challenges for most g‐QDs (e.g., CdSe/CdS) synthesized to date. The synthesis of NIR, heavy metal‐free, Zn‐treated spherical CuInSe2/CuInS2 g‐QDs is reported using the sequential cation exchange method. These g‐QDs exhibit tunable NIR optical absorption and photoluminescence (PL) properties. Transient fluorescence spectroscopy shows prolonged lifetime with increasing shell thickness, indicating the formation of quasi type‐II band alignment, which is further confirmed by simulations. As a proof‐of‐concept, as‐synthesized g‐QDs are used to sensitize TiO2 as a photoanode in a photoelectrochemical (PEC) cell, demonstrating an efficient and stable PEC system. These results pave the way toward synthesizing NIR heavy metal‐free g‐QDs, which are very promising components of future optoelectronic technologies. [ABSTRACT FROM AUTHOR]

Published
2018
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