Investigation of lateral exciton transfer of coexistent quantum dot systems
學年 97
學期 1
出版（發表）日期 2008-10-01
作品名稱 Investigation of lateral exciton transfer of coexistent quantum dot systems
作品名稱（其他語言）
著者 Lee, Jia-ren; Lu, Chien-rong; Jen, Jen-yi
單位 淡江大學物理學系
出版者 College Park: American Institute of Physics
著錄名稱、卷期、頁數 Journal of Applied Physics 104(7), pp.073523(4 pages)
摘要 The optical characterization of the ZnCdSe/ZnSe quantum dot (QDs) system is studied by photoluminescence (PL) spectrum measured at temperatures from 22 to 300 K. The distinct quenching rates of spectral integrated intensity demonstrate that there are divergent lateral exciton transfer modes between two types of coexistent QDs with different sizes and densities. The smaller and denser QD assemblies are advantageous to trigger lateral migration of thermally activated excitons due to their shallower localization and more coupling channels. However, the carrier repopulation-induced redistribution of excitonic emission energy is contrarily observed in the deepest localized case. The extra redshift of transition energy with increasing temperature is attributed to the incompletely three-dimensional excitonic confinement induced by the morphological features. In contrast with scanning probe techniques, using PL as spectral probe is a nondestructive way to explore inner morphology of capped multiple quantum structure.
關鍵字 cadmium compounds; excitons; II-VI semiconductors; photoluminescence; radiation quenching; red shift; scanning probe microscopy; semiconductor quantum dots; zinc compounds
語言 en
ISSN 0021-8979 1089-7550
期刊性質 國內
收錄於 SCI EI
產學合作
通訊作者 Lee, Jia-ren
審稿制度
國別 USA
公開徵稿
出版型式 紙本 電子版
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