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You searched for subject:(hyperdoping). Showing records 1 – 2 of 2 total matches.

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Harvard University

1. Lin, Yu-Ting. Femtosecond-laser hyperdoping and texturing of silicon for photovoltaic applications.

Degree: PhD, Engineering and Applied Sciences, 2014, Harvard University

This dissertation explores strategies for improving photolvoltaic efficiency and reducing cost using femtosecond-laser processing methods including surface texturing and hyperdoping. Our investigations focus on two aspects: 1) texturing the silicon surface to create efficient light-trapping for thin silicon solar cells, and 2) understanding the mechanism of hyperdoping to control the doping profiles for fabricating efficient intermediate band materials.

Engineering and Applied Sciences

Advisors/Committee Members: Mazur, Eric (advisor), Hu, Evelyn (committee member), Aziz, Mike (committee member).

Subjects/Keywords: Energy; Optics; Engineering; hyperdoping; laser; light trapping; mechanism; photovoltaics; texturing

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lin, Y. (2014). Femtosecond-laser hyperdoping and texturing of silicon for photovoltaic applications. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274579

Chicago Manual of Style (16th Edition):

Lin, Yu-Ting. “Femtosecond-laser hyperdoping and texturing of silicon for photovoltaic applications.” 2014. Doctoral Dissertation, Harvard University. Accessed November 17, 2019. http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274579.

MLA Handbook (7th Edition):

Lin, Yu-Ting. “Femtosecond-laser hyperdoping and texturing of silicon for photovoltaic applications.” 2014. Web. 17 Nov 2019.

Vancouver:

Lin Y. Femtosecond-laser hyperdoping and texturing of silicon for photovoltaic applications. [Internet] [Doctoral dissertation]. Harvard University; 2014. [cited 2019 Nov 17]. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274579.

Council of Science Editors:

Lin Y. Femtosecond-laser hyperdoping and texturing of silicon for photovoltaic applications. [Doctoral Dissertation]. Harvard University; 2014. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:12274579


Australian National University

2. Yang, Wenjie. Characterising and understanding Au-hyperdoped Si for sub-band gap optical absorption .

Degree: 2018, Australian National University

The unparalleled technological maturity of silicon (Si) can be exploited to develop CMOS-compatible optoelectronics such as photodetectors and imaging arrays. However, the low-attenuation wavelengths commonly used in fibre-optics (up to 1650 nm) fall below the 1.12 eV band gap of Si (efficient absorption only occurs at wavelengths less than 1100 nm), thus requiring the realisation of sub-band gap photoresponse. A promising method to achieve this is to add an intermediate band within the band gap by incorporating appropriate impurities into the Si lattice at high concentrations (often beyond the thermodynamic solubility limit), or hyperdoping. Indeed, Au-hyperdoped Si made by ion implantation and pulsed laser melting (PLM) has been shown to exhibit strong sub-band gap optical absorption in the near-infrared and has led to the demonstration of a Si-based near-IR photodetector. The Au sub-band gap absorption has been shown to increase with the Au dose, and significant room for further improvement of the device performance has been predicted. While these results illustrate the potential of hyperdoped Si for photodetection in the near-infrared, the material properties of Au- and other transition-metal-hyperdoped Si remain elusive. With this as a premise, this PhD work has focused on characterising and understanding the properties of Au-hyperdoped Si. In this thesis, detailed Rutherford backscattering spectrometry and channeling measurements are undertaken to examine the lattice position of the Au atoms. It is shown that the Au occupies mostly substitutional lattice positions within the hyperdoped Si lattice. In addition, by varying the iplant energy and the implanted Au dose, thicker layers of Au-hyperdoped Si with higher Au concentrations are demonstrated. However, although the Au atoms remain significantly substitutional (more than 50% substitutional in most cases) at high Au concentrations, the Au distribution is found to be non-uniform. Further structural characterisation by transmission electron microscopy and energy dispersive spectroscopy reveals a new observation where filaments of single crystalline, Au-rich Si regions emerge after PLM. The local concentration within such filaments is estimated to be at least 3 at. %, and the proximate Si lattice is found to be slightly skewed. These features suggest a novel segregation regime in Au-hyperdoped Si that is distinctly different to conventional 'cellular breakdown' in hyperdoped Si, in which impurity precipitation might be observed at cell-walls. In spite of the inhomogeneous behaviour of Au-hyperdoped Si at high Au concentrations, the sub-band gap optical absorption is found to continue to increase with increasing substitutional Au dose. This is consistent with density functional theory calculations in which the isolated substitutional Au …

Subjects/Keywords: silicon photonics; ion implantation; pulsed laser melting; hyperdoping; black silicon; near infra-red detection; deep level impurities in Si

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Yang, W. (2018). Characterising and understanding Au-hyperdoped Si for sub-band gap optical absorption . (Thesis). Australian National University. Retrieved from http://hdl.handle.net/1885/154257

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Yang, Wenjie. “Characterising and understanding Au-hyperdoped Si for sub-band gap optical absorption .” 2018. Thesis, Australian National University. Accessed November 17, 2019. http://hdl.handle.net/1885/154257.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Yang, Wenjie. “Characterising and understanding Au-hyperdoped Si for sub-band gap optical absorption .” 2018. Web. 17 Nov 2019.

Vancouver:

Yang W. Characterising and understanding Au-hyperdoped Si for sub-band gap optical absorption . [Internet] [Thesis]. Australian National University; 2018. [cited 2019 Nov 17]. Available from: http://hdl.handle.net/1885/154257.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yang W. Characterising and understanding Au-hyperdoped Si for sub-band gap optical absorption . [Thesis]. Australian National University; 2018. Available from: http://hdl.handle.net/1885/154257

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.