Enable a Facile Size Re-distribution of MBE-Grown Ga-Droplets via In Situ Pulsed Laser Shooting

Nanoscale Research Letters

Wei Zhang¹  Biao Geng²  Changwei Deng²  Xinning Yang²  Zhenwu Shi²  Linyun Yang²  Chen Chen²  Lili Miao²  Changsi Peng³ 

[1] AVIC Huadong Photo-electronics Co., Ltd, 241002, Wuhu, China;School of Optoelectronic Science and Engineering and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 215006, Suzhou, China;Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, 215006, Suzhou, China;School of Optoelectronic Science and Engineering and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 215006, Suzhou, China;Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province and Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, 215006, Suzhou, China;Institute of Research for Applicable Computing, University of Bedfordshire, Park Square, LU1 3JU, Luton, UK;

关键词: Ga-droplet;    In-situ pulsed laser;    Thermal expansion;    Thermal evaporation;    Molecular beam epitaxy;   

DOI  :  10.1186/s11671-021-03583-2

来源: Springer

【 摘 要 】

A MBE-prepared Gallium (Ga)-droplet surface on GaAs (001) substrate is in situ irradiated by a single shot of UV pulsed laser. It demonstrates that laser shooting can facilely re-adjust the size of Ga-droplet and a special Ga-droplet of extremely broad size-distribution with width from 16 to 230 nm and height from 1 to 42 nm are successfully obtained. Due to the energetic inhomogeneity across the laser spot, the modification of droplet as a function of irradiation intensity (IRIT) can be straightly investigated on one sample and the correlated mechanisms are clarified. Systematically, the laser resizing can be perceived as: for low irradiation level, laser heating only expands droplets to make mergences among them, so in this stage, the droplet size distribution is solely shifted to the large side; for high irradiation level, laser irradiation not only causes thermal expansion but also thermal evaporation of Ga atom which makes the size-shift move to both sides. All of these size-shifts on Ga-droplets can be strongly controlled by applying different laser IRIT that enables a more designable droplet epitaxy in the future.

【 授权许可】

CC BY