Tabula rasa

14,000,000 Leading Edge Experts on the ideXlab platform

Scan Science and Technology

Contact Leading Edge Experts & Companies

Scan Science and Technology

Contact Leading Edge Experts & Companies

The Experts below are selected from a list of 2562 Experts worldwide ranked by ideXlab platform

Marett Leiboff - One of the best experts on this subject based on the ideXlab platform.

  • No Idea: Tristram Shandy, transgressive creativity, John Locke’s Tabula rasa, and the legal imaginary
    2011
    Co-Authors: Marett Leiboff
    Abstract:

    Pray, Sir, in all the reading which you have ever read, did you ever read such a book as Locke’s Essay upon the Human Understanding? ——Don’t answer me rashly, –because many, I know, quote the book, who have not read it,—and many have read it who understand it not:— Laurence Sterne, The Life and Opinions of Tristram Shandy, Gentleman, Vol. II, Chap. II Disciplines Arts and Humanities | Law Publication Details M. Leiboff, 'No Idea: Tristram Shandy, transgressive creativity, John Locke’s Tabula rasa, and the legal imaginary' (Paper presented at the 2011 ISHTIP Workshop, Griffith Law School, Brisbane, 5-6 July). This conference paper is available at Research Online: http://ro.uow.edu.au/lhapapers/1601 Marett Leiboff ishtip.org/ No Idea: Tristram Shandy, transgressive creativity, John Locke’s Tabula rasa, and the legal imaginary Marett Leiboff Legal Intersections Research Centre, Faculty of Law University of Wollongong

  • no idea tristram shandy transgressive creativity john locke s Tabula rasa and the legal imaginary
    2011
    Co-Authors: Marett Leiboff
    Abstract:

    Pray, Sir, in all the reading which you have ever read, did you ever read such a book as Locke’s Essay upon the Human Understanding? ——Don’t answer me rashly, –because many, I know, quote the book, who have not read it,—and many have read it who understand it not:— Laurence Sterne, The Life and Opinions of Tristram Shandy, Gentleman, Vol. II, Chap. II Disciplines Arts and Humanities | Law Publication Details M. Leiboff, 'No Idea: Tristram Shandy, transgressive creativity, John Locke’s Tabula rasa, and the legal imaginary' (Paper presented at the 2011 ISHTIP Workshop, Griffith Law School, Brisbane, 5-6 July). This conference paper is available at Research Online: http://ro.uow.edu.au/lhapapers/1601 Marett Leiboff ishtip.org/ No Idea: Tristram Shandy, transgressive creativity, John Locke’s Tabula rasa, and the legal imaginary Marett Leiboff Legal Intersections Research Centre, Faculty of Law University of Wollongong

Daniel Macdonald - One of the best experts on this subject based on the ideXlab platform.

  • impact of Tabula rasa and phosphorus diffusion gettering on 21 heterojunction solar cells based on n type czochralski grown upgrade metallurgical grade silicon
    World Conference on Photovoltaic Energy Conversion, 2018
    Co-Authors: Rabin Basnet, William Weigand, Chang Sun, Sieu P. Phang, Fiacre E. Rougieux, Roland Einhaus, Julien Degoulange, Zachary C. Holman, Daniel Macdonald
    Abstract:

    This paper investigates the impact of Tabula rasa (TR) and phosphorus diffusion gettering (PDG), both in isolation and in combination, for improving the electronic quality of n-type Czochralski grown Upgraded Metallurgical-Grade (UMG) silicon wafers. We have found that the bulk lifetimes of the UMG wafers were affected by both oxygen precipitate nuclei and mobile metallic impurities. Thus, we achieved the best bulk lifetimes after subjecting the UMG wafers to a TR step prior to a PDG step. Further, we report silicon heterojunction solar cells results based on the UMG wafers subjected to a TR step prior to a PDG step. The best in-house measured efficiencies were 21.2 % and 20.8 % for the UMG wafers from the middle and tail regions of the ingot, respectively.

  • Impact of Tabula rasa and Phosphorus Diffusion Gettering on 21% Heterojunction Solar Cells Based on n-Type Czochralski-Grown Upgrade Metallurgical-Grade Silicon
    2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC 28th PVSEC & 34th EU PVSEC), 2018
    Co-Authors: Rabin Basnet, William Weigand, Chang Sun, Sieu P. Phang, Fiacre E. Rougieux, Roland Einhaus, Julien Degoulange, Zachary C. Holman, Daniel Macdonald
    Abstract:

    This paper investigates the impact of Tabula rasa (TR) and phosphorus diffusion gettering (PDG), both in isolation and in combination, for improving the electronic quality of n-type Czochralski grown Upgraded Metallurgical-Grade (UMG) silicon wafers. We have found that the bulk lifetimes of the UMG wafers were affected by both oxygen precipitate nuclei and mobile metallic impurities. Thus, we achieved the best bulk lifetimes after subjecting the UMG wafers to a TR step prior to a PDG step. Further, we report silicon heterojunction solar cells results based on the UMG wafers subjected to a TR step prior to a PDG step. The best in-house measured efficiencies were 21.2 % and 20.8 % for the UMG wafers from the middle and tail regions of the ingot, respectively.

Paul Stradins - One of the best experts on this subject based on the ideXlab platform.

  • Influence of Tabula rasa on Process- and Light-Induced Degradation of Solar Cells Fabricated From Czochralski Silicon
    IEEE Journal of Photovoltaics, 2020
    Co-Authors: Abigail R Meyer, Vincenzo Lasalvia, William Nemeth, Matthew Page, David L Young, Sumit Agarwal, Paul Stradins
    Abstract:

    Monocrystalline Si solar cells are fabricated from Czochralski (Cz) Si, which contains 1017–1018 cm−3 oxygen atoms. Cz Si undergoes degradation during high-temperature thermal processing steps, such as dopant diffusion to form the p - n junction. This degradation in the bulk minority carrier lifetime can be related to the formation of oxygen precipitates. We found that a high-temperature annealing process known as Tabula rasa (TR) not only mitigates process-induced degradation via oxygen precipitate nuclei dissolution, but also modifies subsequent light-induced degradation. We report on the bulk carrier lifetime of n - and p -type Cz Si after TR, which homogenizes the interstitial oxygen in the bulk Si to its monoatomic form in either an N2 or O2 environment. A control sample, which was not subjected to a TR processing step, experienced severe process-induced degradation during a boron emitter thermal budget as oxygen precipitates were formed in the Si bulk. These precipitates could be imaged using photoluminescence. Additionally, samples that underwent a TR processing step prior to the boron emitter thermal budget show efficient gettering of metallic impurities compared to the control sample, which showed a decline in the implied open-circuit voltage after the gettering step. Furthermore, modification of the interstitial oxygen bonding by TR had a strong effect on the light-induced degradation kinetics. Instead of a typically observed monotonic decrease, minority carrier lifetime increases first, followed by a nonmonotonic decrease over a ∼20 h period. We conclude that by modifying the interstitial oxygen bonding via TR pretreatment, p -type Cz Si wafers become substantially resistant to harsh solar cell processes and strongly modified light-induced degradation, which would open alternative ways to mitigate this degradation mechanism.

  • mitigating process induced degradation in p and n czochralski silicon wafers with Tabula rasa
    Photovoltaic Specialists Conference, 2019
    Co-Authors: Abigail R Meyer, Vincenzo Lasalvia, William Nemeth, Matthew Page, David L Young, Sumit Agarwal, Paul Stradins
    Abstract:

    We report on the bulk properties of of n- and p- type Czochralski silicon (Cz-Si) after a high-temperature annealing process known as Tabula rasa (TR), which is primarily used to annihilate oxygen precipitates. We find significant differences in n- and p-type substrates as well as a strong dependence on the ambient in the resulting process induced degradation. We attribute this ambient dependence to either injection of interstitials or vacancies into the bulk during TR. Finally, we show that subsequent gettering is enhanced due to the annihilation of oxygen precipitates.

  • Oxygen migration enthalpy likely limits oxide precipitate dissolution during Tabula rasa
    Applied Physics Letters, 2017
    Co-Authors: Erin E. Looney, Vincenzo Lasalvia, Amanda Youssef, Paul Stradins, Mallory A. Jensen, Hannu S. Laine, Tonio Buonassisi
    Abstract:

    In industrial silicon solar cells, oxygen-related defects lower device efficiencies by up to 20% (rel.). In order to mitigate these defects, a high-temperature homogenization anneal called Tabula rasa (TR) that has been used in the electronics industry is now proposed for use in solar-grade wafers. This work addresses the kinetics of Tabula rasa by elucidating the activation energy governing oxide precipitate dissolution, which is found to be 2.6 ± 0.5 eV. This value is consistent within uncertainty to the migration enthalpy of oxygen interstitials in silicon, implying TR to be kinetically limited by oxygen point-defect diffusion. This large activation energy is observed to limit oxygen precipitate dissolution during standard TR conditions, suggesting that more aggressive annealing conditions than conventionally used are required for complete bulk microdefect mitigation.

  • Process-Induced Degradation Resistant n-Cz Wafers through Tabula rasa Defect Engineering
    2017 IEEE 44th Photovoltaic Specialist Conference (PVSC), 2017
    Co-Authors: Vincenzo Lasalvia, William Nemeth, Matthew Page, Wooseok Nam, Youngsik Han, Sungsun Baik, Amanda Youssef, Tonio Buonassisi, Paul Stradins
    Abstract:

    We explore a simple annealing technique Tabula rasa that allows monocrystalline n-type Czochralski silicon (n-Cz) wafers to avoid the oxygen precipitation that occurs during solar cell processing at high thermal budget. With this technique, the deep B emitter formation used in n-FZ based record efficiency Si cells, now becomes possible in n-Cz wafers. Wafers of both low and high Oi are subject to different Tabula rasa processes that inject either vacancies or interstitials. As a result, we see strong variations in the carrier lifetime immediately after Tabula rasa treatments in various ambients. However, after a thermal budget of the deep boron emitter formation, these variations disappear and we see significant lifetime improvement after Tabula rasa, especially in wafers with high Oi content. This suggests that Tabula rasa, an industrially relevant batch technique, could be successfully implemented for n-Cz wafers to remain oxygen precipitation-free during high efficiency n-type Cz solar cell processing and greatly improving fabrication yield.

  • Tabula rasa: Oxygen precipitate dissolution though rapid high temperature processing in silicon
    2017 IEEE 44th Photovoltaic Specialist Conference (PVSC), 2017
    Co-Authors: Erin E. Looney, Vincenzo Lasalvia, Amanda Youssef, Paul Stradins, Mallory A. Jensen, Hannu S. Laine, Tonio Buonassisi
    Abstract:

    Over one fourth of all monocrystalline silicon ingots suffer from a 20% performance degradation due to oxygen precipitates. Tabula rasa (TR) is a mitigation technique that dissolves these precipitates, making them harmless. This work explores the dependence of oxygen dissolution on annealing time and temperature for the TR process to aid in solar cell process optimization. The dissolution time for oxygen precipitates was found to be more than 10 minutes for total dissolution, longer than normal TR process times in the electronics industry. The activation energy, extracted from the precipitate dissolution curves, is found to be 2.6±0.5 eV. This value when compared to the migration enthalpy of oxygen in silicon can be used to reveal the energy limiting proces in TR.

Raimund Dachselt - One of the best experts on this subject based on the ideXlab platform.

  • villains architects and micro managers what Tabula rasa teaches us about game orchestration
    Human Factors in Computing Systems, 2013
    Co-Authors: T Nicholas C Graham, Irina Schumann, Mrunal Patel, Quentin Bellay, Raimund Dachselt
    Abstract:

    Players of digital games are limited by the constraints of the game's implementation. Players cannot fly a kite, plant a tree or make friends with a dragon if these activities were not coded within the game. Game orchestration relaxes these restrictions by allowing players to create game narratives and settings as the game is being played. This enables players to express their creativity beyond the strictures of the game's implementation. We present Tabula rasa, a novel game orchestration tool based on an efficient tabletop interface. Based on a study of 20 game orchestration sessions using Tabula rasa, we identify five behavioural patterns adopted by orchestrators, and four styles of collaborative interaction between orchestrators and players. Finally, we present recommendations for designers of game orchestration systems.

  • CHI - Villains, architects and micro-managers: what Tabula rasa teaches us about game orchestration
    Proceedings of the SIGCHI Conference on Human Factors in Computing Systems - CHI '13, 2013
    Co-Authors: T. C. Nicholas Graham, Irina Schumann, Mrunal Patel, Quentin Bellay, Raimund Dachselt
    Abstract:

    Players of digital games are limited by the constraints of the game's implementation. Players cannot fly a kite, plant a tree or make friends with a dragon if these activities were not coded within the game. Game orchestration relaxes these restrictions by allowing players to create game narratives and settings as the game is being played. This enables players to express their creativity beyond the strictures of the game's implementation. We present Tabula rasa, a novel game orchestration tool based on an efficient tabletop interface. Based on a study of 20 game orchestration sessions using Tabula rasa, we identify five behavioural patterns adopted by orchestrators, and four styles of collaborative interaction between orchestrators and players. Finally, we present recommendations for designers of game orchestration systems.

Rabin Basnet - One of the best experts on this subject based on the ideXlab platform.

  • impact of Tabula rasa and phosphorus diffusion gettering on 21 heterojunction solar cells based on n type czochralski grown upgrade metallurgical grade silicon
    World Conference on Photovoltaic Energy Conversion, 2018
    Co-Authors: Rabin Basnet, William Weigand, Chang Sun, Sieu P. Phang, Fiacre E. Rougieux, Roland Einhaus, Julien Degoulange, Zachary C. Holman, Daniel Macdonald
    Abstract:

    This paper investigates the impact of Tabula rasa (TR) and phosphorus diffusion gettering (PDG), both in isolation and in combination, for improving the electronic quality of n-type Czochralski grown Upgraded Metallurgical-Grade (UMG) silicon wafers. We have found that the bulk lifetimes of the UMG wafers were affected by both oxygen precipitate nuclei and mobile metallic impurities. Thus, we achieved the best bulk lifetimes after subjecting the UMG wafers to a TR step prior to a PDG step. Further, we report silicon heterojunction solar cells results based on the UMG wafers subjected to a TR step prior to a PDG step. The best in-house measured efficiencies were 21.2 % and 20.8 % for the UMG wafers from the middle and tail regions of the ingot, respectively.

  • Impact of Tabula rasa and Phosphorus Diffusion Gettering on 21% Heterojunction Solar Cells Based on n-Type Czochralski-Grown Upgrade Metallurgical-Grade Silicon
    2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC 28th PVSEC & 34th EU PVSEC), 2018
    Co-Authors: Rabin Basnet, William Weigand, Chang Sun, Sieu P. Phang, Fiacre E. Rougieux, Roland Einhaus, Julien Degoulange, Zachary C. Holman, Daniel Macdonald
    Abstract:

    This paper investigates the impact of Tabula rasa (TR) and phosphorus diffusion gettering (PDG), both in isolation and in combination, for improving the electronic quality of n-type Czochralski grown Upgraded Metallurgical-Grade (UMG) silicon wafers. We have found that the bulk lifetimes of the UMG wafers were affected by both oxygen precipitate nuclei and mobile metallic impurities. Thus, we achieved the best bulk lifetimes after subjecting the UMG wafers to a TR step prior to a PDG step. Further, we report silicon heterojunction solar cells results based on the UMG wafers subjected to a TR step prior to a PDG step. The best in-house measured efficiencies were 21.2 % and 20.8 % for the UMG wafers from the middle and tail regions of the ingot, respectively.