Mobility and Spatial Distribution of Photoexcited Electrons in CdSe/CdS Nanorods

详细信息    查看全文

• 作者：Lucas T. Kunneman ; Marco Zanella ; Liberato Manna ; Laurens D. A. Siebbeles ; Juleon M. Schins
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：February 14, 2013
• 年：2013
• 卷：117
• 期：6
• 页码：3146-3151
• 全文大小：314K
• 年卷期：v.117,no.6(February 14, 2013)
• ISSN：1932-7455

文摘

The mobility and spatial distribution of photoexcited electrons in CdSe/CdS core/shell nanorods was studied using optical-pump THz-probe spectroscopy. Measurements were conducted on two samples, differing in rod length. After photoexcitation the hole localizes in the CdSe core within a picosecond, while the electron delocalizes around the core. Analysis of the THz mobility with a model of one-dimensional electron diffusion on a finite rod yields an electron delocalization of 25% into the CdS shell and a mobility of 700 cm²/(V s). This is one and a half times the mobility value for bulk CdS, which can be due to quantum confinement effects on electron鈥損honon scattering and electronic structure.