Bandgap Tuning of Silicon Quantum Dots by Surface Functionalization with Conjugated Organic Groups

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• 作者：Tianlei Zhou ; Ryan T. Anderson ; Huashan Li ; Jacob Bell ; Yongan Yang ; Brian P. Gorman ; Svitlana Pylypenko ; Mark T. Lusk ; Alan Sellinger
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：June 10, 2015
• 年：2015
• 卷：15
• 期：6
• 页码：3657-3663
• 全文大小：463K
• ISSN：1530-6992

文摘

The quantum confinement and enhanced optical properties of silicon quantum dots (SiQDs) make them attractive as an inexpensive and nontoxic material for a variety of applications such as light emitting technologies (lighting, displays, sensors) and photovoltaics. However, experimental demonstration of these properties and practical application into optoelectronic devices have been limited as SiQDs are generally passivated with covalently bound insulating alkyl chains that limit charge transport. In this work, we show that strategically designed triphenylamine-based surface ligands covalently bonded to the SiQD surface using conjugated vinyl connectivity results in a 70 nm red-shifted photoluminescence relative to their decyl-capped control counterparts. This suggests that electron density from the SiQD is delocalized into the surface ligands to effectively create a larger hybrid QD with possible macroscopic charge transport properties.