Light formation mechanisms induced by well-aligned sub-20-nm Ag quantum dots produced alongside patterned porous Si walls and bottoms
- Authors
- Bang, Jae Hoon; Choi, Myung Sik; Na, Han Gil; Oum, Wansik; Choi, Sun-Woo; Kim, Hyoun Woo; Jin, Changhyun
- Issue Date
- Apr-2020
- Publisher
- ELSEVIER GMBH
- Keywords
- Sub-20-nm Ag nanoparticles; Si; Plasmonic effect
- Citation
- OPTIK, v.207, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- OPTIK
- Volume
- 207
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1967
- DOI
- 10.1016/j.ijleo.2020.164480
- ISSN
- 0030-4026
- Abstract
- Sub-20-nm Ag nanoparticles created via sputtering were freely moved into preformed Si pores and were arranged along both wall and lower surfaces in etched Si layers via a post-thermal annealing treatment. The variously sized Ag quantum dots on the porous Si facilitate broadband visible emission via photo-generated enhanced luminescent effects, i.e., plasmonic effects of Ag nanoparticles by electron transfer from the Si-based matrix to the metallic Ag. The emission wavelengths and intensities, depending on the sizes of the Ag quantum dots, were determined by the degree of oxidation of the Si-based substrate such as Si, SiOx, and SiO2, according to different post-thermal annealing conditions. The morphological, microstructural, and optical evolution of Ag nanoparticles and Si pores were simply observed via side-cross-sectional scanning electron microscopy, X-ray diffraction, transmission electron microscopy, and crystalline-controlled photoluminescence analyses, respectively. The origin of a new systematic luminescence mechanism based on energy-equilibria is also presented.
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