Janet Tate, Okan Agirseven, Pritha Biswas, Rohal Kakepoto, Julian Wulf

All welcome at any meeting

• Weekly reports are due at individual meetings (load into Box / Tate Lab / Tate Lab Shared Folder / 01-Weekly Reports / 2020MMDD folder (MMDD = date of the Monday of the week of the meeting; filname must have your name and date).
• Meetings located at https://oregonstate.zoom.us/j/980944054 for spring term 2020

Bring with you

• Weekly progress report and goals
• Lab notebook
• Printouts of data and analysis

Any data or graphs must be labeled with your name, the date (including year), the sample(s) identification, and correctly labeled axes, columns etc. Data that lack any of these are useless in a few days.

Everyone, please bookmark this wiki page and update information regularly, and transfer your data to the CoSINe server weekly.

Rotation students on TA appointments who are signed up for N credits of PH401, PH501, PH601 are expected to commit at least 3N hours a week to research. Please attend the weekly colloquium and solid state seminar, and grads please attend orals lunch.

Agendas

7/10 Group meeting Pritha - (i) Rare polymorphs of SnO2

7/17 Group meeting Julian - On the way to modeling TiO2/SnO2

7/24 Group meeting Okan - Annealing TiO2 BAR samples - Avrami analysis and mechanism; also check on lab safety items from Amy Carter

7/x Group meeting Rohal - Hall effect in ITO

7/x Group meeting Julian - Modeling TiO2/SnO2 (effective)

7/x Group meeting Pritha - (ii) The SnO2/TiO2 amorphous precursors & films

Past meetings

4/1 Group meeting All - set up meetings/talks, computer issues, Box, Zoom, general stuff

4/2 transport meeting Acacia report on progress; Rohal report on progress; Janet - Hall effect pitfalls.

4/3 growth meeting Okan - Report on progress.

4/8 Group meeting Okan - Growth and nucleation literature and theory overview. - great talk - thanks!

4/15 Group meeting Acacia - Resistivity in semiconductors (Synopsis/background, overview of project, semiconductor, ballistic/hopping, etc.) 7/22 Group meeting Joe - Optical dispersion models: Cauchy and Selllmeier equations, Oscillators for absorbing materials, Complex refractive index, difference in optical constants between amorphous and crystalline films, SiO2 and Si substrates

4/29 Group meeting Pritha - The SnO2/TiO2 system (Previous literature review on “TiO2+SnO2” spinodal decomposition - Why the system is important to look at and future prospect; also other things known about TiO2/SnO2 system).

5/6 Group meeting Cameron - R&T comparison for similar thickness TiO2 films; Bandgap between amorphous and crystalline films

5/13 Group meeting Rohal - What is an n-type and what’s a p-type semiconductor?

5/20 Group meeting Julian - What is the complex refractive index of a material?

Janet Tate, Okan Agirseven, Pritha Biswas, Acacia Patterson, Cameron Stewart, Elena Wennstrom, Joseph Kreb, Rohal Kakepoto

Janet Tate, Okan Agirseven, Pritha Biswas, Acacia Patterson, Cameron Stewart, Elena Wennstrom, Joseph Kreb

Summer 2019 goals:

Acacia: Measure temperature-dependent (77K - 300K) transport properties of ITO (metal), TiO2 (semiconductor). TiO2: Compare pre and post for each sample (brookite, anatase, rutile and mixtures; also photoactive). TiO2 11 (B/R) & 49 (B/R) are semiconducting pre and post, but with post samples more conductive. Activation energy for resistance is greater in higher resistivity samples. • Try to find samples with post samples less conductive and compare activation energies, mobilities etc. • Measure photoactive samples • Do the photoactive samples change resistivity when UV light is shine on them during a measurement? • Search literature for activation energies etc. for TiO2

ITO: Measure rho(T), n(T), mu(T) for ITO and try to fit to Bloch-Grüneisen law. • Check thickness via ellipsometry • Jenn Amador may have interesting SnO2:F films to measure • Could try to find different thicknesses of ITO to test whether quantum effects are visible.

Long term - could go to higher temperatures in high-T Hall probe if there are interesting things to learn (lower priority). Coordinate with Okan while Janet is away.

Cameron: Measure R and T of Okan's TiO2 samples (brookite, anatase, rutile and mixtures; also photoactive) on the grating spectrometer. Coordinate with Joseph who is measuring on the ellipsometer. Both coordinate with Acacia when particular samples are interesting. Learn the index calc spread sheet to analyse for thickness. Try to set up SCOUT to get thickness from fitting. Coordinate with Okan while Janet is away.

Joseph: Measure R and T of Okan's TiO2 samples (brookite, anatase, rutile and mixtures; also photoactive) on the ellipsometer. Coordinate with Cameron who is measuring on the grating spectrometer. Both coordinate with Acacia when particular samples are interesting. Try to set up SCOUT to get thickness etc. to match results from software on ellipsometer. Coordinate with Okan while Janet is away.

Elena: Measure Brownian motion of 3-µm microspheres with video camera. Analyze with ImageJ, using techniques from the papers you've read. Compare to 1-µm microspheres. Use different viscosity liquids. How is it best to pose the problem - as a measurement of viscosity? As a measurement of Avogadro's number? As an investigation of thermal fluctuations?

Will purchasing a fluorescent system allow us to track simple cells? Coordinate with Bo Sun and Ethan Minot while Janet is away.

Janet Tate, Okan Agirseven, Acacia Patterson, Cameron Stewart, Elena Wennstrom, Joseph Kreb

Janet Tate, Okan Agirseven, Pritha Biswas, Kelda Diffendaffer; Patrick Berry, Acacia Patterson, Joseph Kreb, Cameron Stewart

Janet Tate, Okan Agirseven, Kelda Diffendaffer; Patrick Berry, Acacia Patterson, Izak McGieson, Pritha Biswas, Joseph Kreb

Janet Tate, Okan Agirseven, Kelda Diffendaffer; Patrick Berry

Janet Tate, Bethany Matthews, James Haggerty, Okan Agirseven, Aaron Dethlefs, David Rivella, Kelda Diffendaffer; Patrick Berry

Janet Tate, Bethany Matthews, James Haggerty, Okan Agirseven, Aaron Dethlefs, David Rivella, Ryan Lance, Kelda Diffendaffer; Patrick Berry

Janet Tate, Bethany Matthews, James Haggerty, Okan Agirseven, Aaron Dethlefs, David Rivella, Ryan Lance, Kelda Diffendaffer; James May, Patrick Berry

Janet Tate, James Haggerty, Okan Agirseven, Aaron Dethlefs, David Rivella, Ryan Lance, Kelda Diffendaffer; Bethany Matthews (on assignment to NREL until November); Hazel Betz & James May

Agenda Tue 5 December:

• Bethany - nitride work at NREL

Agenda Tue 28 November:

• All - update

Agenda Tue 14 November:

• David - update on nitride work (20-30 min)

Agenda Tue 7 November:

• Aaron - update on transport work (ITO/Si) (20-30 min)
• Okan - update on Raman system

Agenda Tue 31 October:

• Ryan - update on optical work (SnCaSe?) (20-30 min)

Agenda Tue 24 October:

• Okan - prelim talk on oxygen in TiO2 (20-30 min)
• Raman system - Wed/Thu/Fri (move boxes and computer Tuesday?)
• November 5 conference
• Kelda Diffendaffer joining group
• Group photo?
• Okan - safety update

Agenda Tue 16 October:

• James - run through slides for MS talk (20-30 min)
• Raman system - plan?

Agenda Tue 9 October:

• Janet - highlight talk (5 min)
• Ryan - thesis goals (5 min)
• Aaron - thesis goals (5 min)
• Results from the group
• Hall measurements
• Conference @ OSU, November

Agenda Tue 3 October:

• David - status of nitride project (30 min)

Agenda Tue 25 September:

• Okan - status of TiO2 project pressure-dependent amorph precursors (30 min)

Agenda Tue 18 September:

• James - status of his part of the TiO2 project (30 min)

Agenda Tue 12 September:

• Ryan will give his 3-minute lightening talk again to practice for Thursday.
• Highlights of the week’s work.
• Janet: some slides about phase transitions and phase separation which relate to Daniil’s new result about strain in TiO2 polymorphs.
• Set dates for presentations during the term.
• Raman scope, ….

Agenda Tue 22 August:

• Okan - XPS primer, XPS data update, pO2 update
• Set next presentations

Agenda Tue 15 August:

• Aaron - PPMS update
• James - proposed TGA on TiO2 films(time permitting)
• Set next presentations

Agenda Tue 11 July:

• David - progress on AlN

Agenda Mon 3 July:

• Ryan - Scout tutorial

Agenda Tue 27 June:

• Summer plans
• TiO2 review

Janet Tate, James Haggerty, Okan Agirseven, Aaron Dethlefs, David Rivella, Ryan Lance; Bethany Matthews (on assignment to NREL); James May (part-time)

Janet Tate, Bethany Matthews, James Haggerty, Okan Agirseven, Michael Forkner, James May, Hazel Betz, Aaron Dethlefs, Ryan Lance, David Rivella

Janet Tate, Bethany Matthews, James Haggerty, Okan Agirseven, Michael Forkner, James May, Hazel Betz, Ryan Lance, Aaron Dethlefs.

Janet Tate, Bethany Matthews, James Haggerty, Okan Agirseven, Michael Forkner, James May, Hazel Betz, Ryan Lance, Aaron Dethlefs.

Janet Tate, Bethany Matthews, James Haggerty, Michael Forkner, James May, & Okan Agirseven joined in late summer.

Janet Tate, Bethany Matthews, James Haggerty, Josh Stahly, Michael Forkner, James May

Janet Tate, Bethany Matthews, James Haggerty, Josh Stahly, Michael Forkner, James May

Janet Tate, Bethany Matthews, James Haggerty, Chiyuki Sato, Josh Stahly, Michael Forkner, James May

Janet Tate, Bethany Matthews, James Haggerty,Chiyuki Sato, Emily Thomas

Janet Tate, Bethany Matthews, James Haggerty, Josh Mutch, Scott Hutchings, Alex Poff, Katie Banowetz, Josh Stahly

Janet Tate, Bethany Matthews, James Haggerty, Chris Reidy, Josh Mutch, Scott Hutchings, Alex Poff, Katie Banowetz

Janet Tate, Bethany Matthews, James Haggerty, Chris Reidy, Josh Mutch, Scott Hutchings, Alex Poff

Janet Tate, Bethany Matthews, James Haggerty, Chris Reidy, Josh Mutch, (Anna Koutsopoulos)

Janet Tate, Chris Reidy, Kai Zhan, Bethany Matthews, James Haggerty, Rodney Snyder, Daniel Speer, Aaron Kratzer, Josh Mutch, Anna Koutsopoulos, Scott Hutchings

Janet Tate, Chris Reidy, Kai Zhan, Rodney Snyder, Daniel Speer, Aaron Kratzer, Josh Mutch

Janet Tate, Chris Reidy, Kai Zhan, Rodney Snyder, Daniel Speer, Aaron Kratzer, Josh Mutch

Janet Tate, Jason Francis, Kyle MacLelland, Chris Reidy, Kai Zhan, River Wiedle, Kat Prudell, Rodney Snyder, Daniel Speer, Aaron Kratzer, Rose Banauch, James Cutz

Janet Tate, Jason Francis, Chris Reidy, River Wiedle, Novela Auparay, Kat Prudell, Ben Howorth, Rodney Snyder, Daniel Speer, Casey Hines, Aaron Kratzer

Janet Tate, Jason Francis, Chris Reidy, River Wiedle, Kat Prudell, Ben Howorth, Rodney Snyder, Casey Hines, Aaron Kratzer

Janet Tate, Jason Francis, Chris Reidy, River Wiedle, Novela Auparay, Kat (Stevens) Prudell, Ben Howorth, Rodney Snyder

Janet Tate, Jason Francis, Chris Reidy, River Wiedle, Novela Auparay, Kat Stevens, Ben Howorth, Rodney Snyder, Nicola Schmidt

Janet Tate, Jason Francis, Chris Reidy, Matt Oostman, Subin Sahu, River Wiedle, Kevin Albright, Novela Auparay, Kat Stevens, Ben Howorth, Rodney Snyder, Nicola Schmidt

Janet Tate, Jason Francis, Chris Reidy, Matt Oostman, Subin Sahu, River Wiedle, Kevin Albright, Novela Auparay

Janet Tate, Jason Francis, Chris Reidy, River Wiedle, Matt Oostman

Janet Tate, Jason Francis, Chris Reidy, River Wiedle, (Matt Oostman), Sam Settlemeier, (Bevan Li)

Janet Tate, Jason Francis, Chris Reidy, River Wiedle, Rachel Waite, Matt Oostman

Janet Tate, Jason Francis, Chris Reidy, River Wiedle, Rachel Waite, Jake Jacobs, Grant Salzberger

Janet Tate, Annette Richard, Josh Russell, Jason Francis, Chris Reidy, River Wiedle, Rachel Waite