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- Title
Near‐Infrared, Heavy Metal‐Free Colloidal “Giant” Core/Shell Quantum Dots.
- Authors
Tong, Xin; Kong, Xiang‐Tian; Zhou, Yufeng; Navarro‐Pardo, Fabiola; Selopal, Gurpreet Singh; Sun, Shuhui; Govorov, Alexander O.; Zhao, Haiguang; Wang, Zhiming M.; Rosei, Federico
- 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.
- Subjects
OPTOELECTRONICS; QUANTUM dots; HEAVY metals; COLLOIDS; STRUCTURAL shells; COPPER compounds
- Publication
Advanced Energy Materials, 2018, Vol 8, Issue 2, p1
- ISSN
1614-6832
- Publication type
Article
- DOI
10.1002/aenm.201701432