Near‐Infrared, Heavy Metal‐Free Colloidal “Giant” Core/Shell Quantum Dots,Advanced Energy Materials

当前位置： X-MOL 学术 › Adv. Energy Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Near‐Infrared, Heavy Metal‐Free Colloidal “Giant” Core/Shell Quantum Dots
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2017-09-18 , DOI: 10.1002/aenm.201701432
Xin Tong _{1,

2} , Xiang-Tian Kong _{1,

3} , Yufeng Zhou ₂ , Fabiola Navarro-Pardo _{1,

2} , Gurpreet Singh Selopal _{1,

2} , Shuhui Sun _{1,

2} , Alexander O. Govorov ₃ , Haiguang Zhao ₂ , Zhiming M. Wang ₁ , Federico Rosei _{1,

2}

Affiliation

“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.

中文翻译：

近红外，不含重金属的胶体“巨型”核/壳量子点

“巨型”核/壳量子点（g-QD）是未来光电子技术有希望的一类材料，因为与裸量子点和核/薄壳量子点相比，它们的化学和光稳定性更高。然而，迄今为止，对于大多数合成的g-QD（例如CdSe / CdS）来说，可见光和近红外（NIR）区域的光吸收不足以及有毒重金属（例如Cd和Pb）的频繁使用仍然是主要挑战。NIR，无重金属，Zn处理的球形CuInSe ₂ / CuInS ₂的合成使用顺序阳离子交换方法报告g-QD。这些g-QD具有可调节的NIR光学吸收和光致发光（PL）特性。瞬态荧光光谱法表明，随着壳厚度的增加，使用寿命延长，表明形成了准II型谱带对准，这一点已通过模拟得到了进一步证实。作为概念验证，已合成的g-QD用于将TiO ₂敏化为光电化学（PEC）电池中的光阳极，证明了有效而稳定的PEC系统。这些结果为合成近红外无重质g-QD铺平了道路，这是未来光电技术的非常有希望的组成部分。

更新日期：2017-09-18

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11