Exciton Scattering Mechanism in a Single Semiconducting MgZnO Nanorod

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• 作者：Jinkyoung Yoo ; Le Si Dang ; Bonghwan Chon ; Taiha Joo ; Gyu-Chul Yi
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：February 8, 2012
• 年：2012
• 卷：12
• 期：2
• 页码：556-561
• 全文大小：380K
• 年卷期：v.12,no.2(February 8, 2012)
• ISSN：1530-6992

文摘

Excitonic phenomena, such as excitonic absorption and emission, have been used in many photonic and optoelectronic semiconductor device applications. As the sizes of these nanoscale materials have approached to exciton diffusion lengths in semiconductors, a fundamental understanding of exciton transport in semiconductors has become imperative. We present exciton transport in a single MgZnO nanorod in the spatiotemporal regime with several nanometer-scale spatial resolution and several tens of picosecond temporal resolution. This study was performed using temperature-dependent cathodoluminescence and time-resolved photoluminescence spectroscopies. The exciton diffusion length in the MgZnO nanorod decreased from 100 to 70 nm with increasing temperature in the range of 5 and 80 K. The results obtained for the temperature dependence of exciton diffusion length and luminescence lifetime revealed that the dominant exciton scattering mechanism in MgZnO nanorod is exciton鈥損honon assisted piezoelectric field scattering.

Keywords:

Exciton scattering; exciton diffusion; MgZnO; nanorod; quantum structure; cathodoluminescence; time-resolved photoluminescence