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공공누리This item is licensed Korea Open Government License

Title
Optical TCAD on the Net: A tight-binding study of inter-band light transitions in self-assembled InAs/GaAs quantum dot photodetectors
Author(s)
류훈남덕윤안부영이종숙조금원
Publication Year
2013-01-01
Abstract
A new capability of our well-known NEMO 3-D simulator (Ref. Klimeck et al., 2007 [10]) is introduced by carefully investigating the utility of semiconductor quantum dots as infrared photodetectors at a wavelength of 1.2.5 . We not only present a detailed description of the simulation methodology coupled to the atomistic sp3d5s∗ tight-binding band model, but also validate the suggested methodology with a focus on a proof of principle on small GaAs quantum dots (QDs). Then, we move the simulation scope to optical properties of realistically sized dome-shaped InAs/GaAs QDs that are grown by self- assembly and typically contain a few million atoms. Performing numerical experiments with a variation in QD size, we not only show that the strength of ground state inter- band light transitions can be optimized via QD size-engineering, but also find that the hole ground state wavefunction serves as a control factor of transition strengths. Finally, we briefly introduce the web-based cyber infrastructure that is developed as a government- funded project to support online education and research via TCAD simulations. This work not only serves as a useful guideline to experimentalists for potential device designs and other modelers for the self-development of optical TCAD, but also provides a good chance to learn about the science gateway project ongoing in the Republic of Korea.
Keyword
Optoelectronics; Tight-binding; Atomistic Modeling; III-V photodetector; Parallel computing; Science gateway
Journal Title
Mathematical and computer modelling
Citation Volume
58
ISSN
0895-7177
DOI
10.1016/j.mcm.2012.11.024
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Appears in Collections:
7. KISTI 연구성과 > 학술지 발표논문
URI
https://repository.kisti.re.kr/handle/10580/14133
http://www.ndsl.kr/ndsl/search/detail/article/articleSearchResultDetail.do?cn=NART66082844
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