Red Luminesecnce from Self-Assembled InAlAs/AlGaAs Quantum Dots with Bimodal Size Distribution  

作　　者：ZHOU Wei XU Bo XU Huai-zhe LIU Feng-qi GONG Qian JIANG Wei-hong SUN Zhong-zhe DING Ding LIANG Ji-bei WANG Zhan-guo ZHU Zuo-ming LI Guo-hua 周伟;徐波;许怀哲;刘峰奇;龚谦;姜卫红;孙中哲;丁鼎;梁基本;王占国;朱作明;李国华(Laboratory of Semiconductor Materials Science,Chinese Academy of Sciences,Beijing 100083;National Laboratory for Superlittices and Microstructures,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083)

机构地区：[1]Laboratory of Semiconductor Materials Science,Chinese Academy of Sciences,Beijing 100083 [2]National Laboratory for Superlittices and Microstructures,Institute of Semiconductors,Chinese Academy of Sciences,Beijing 100083

出　　处：《Chinese Physics Letters》1999年第4期298-300,共3页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No.69736010;the National Advanced Materials Committee of China(715-014-0040).

摘　　要：Red-emitting at about 640nm from self-assembled In0.55Al0.45As/Al0.5Ga0.5As quantum dots grown on GaAs substrate by molecular beam epitaxy are demonstrated.A doublepeak structure of photoluminescence(PL)spectra from quantum dots was observed,and a bimodal distribution of dot sizes was also confirmed by an atomic force micrograph(AFM)image for uncapped sample.From the temperature and excitation intensity dependence of PL spectra,it is found that the double-peak structure of PL spectra from quantum dots is strongly correlated to the two predominant quantum dot families.Taking into account the quantum-size effect on the peak energy,it is proposed that the high(low)energy peak results from a smaller(larger)dot family,and this result is identical to the statistical distribution of dot lateral size from the AFM image.

关 键 词：MODAL SIZES distribution 

分 类 号：R52[医药卫生—内科学]