6th Annual CdTe Photovoltaics Workshop


Dear Colleagues,

Last year we held our 5th CdTe workshop in conjunction with the II-VI Workshop in Chicago, IL. The event was well-attended, and the feedback we received from the participants was quite positive. A deeper technical interaction and an exclusive focus on CdTe PV makes this a unique and useful annual event to develop and strengthen a close CdTe research community, clarify and define research needs, and identify new opportunities for collaborative research in CdTe PV.

In this spirit, it is our pleasure to invite you to the 6th Workshop, to be hosted at The University of Toledo Main Campus. Randy Ellingson (UT) has volunteered to be our local host for this year’s event, and Michael Heben (UT) is the Program Chair. Day 2 Roadmapping will be organized by Matt Reese (NREL) and Jim Sites (CSU). The 6th workshop will again be structured in two parts:

Looking forward to a great workshop!
The US-MAC CdTe Workshop team

Agenda Thursday, Oct 20

30 8:00 AM 8:30 AM Coffee and Registration
10 8:30 AM 8:40 AM Welcome, Announcements - Gang Xiong (FSLR)/Mike Heben (UT)
15 8:40 AM 8:55 AM 1 First Solar Update Bill Huber (First Solar)
15 8:55 AM 9:10 AM 2 Semitransparent CdTe Coatings for PV-Insulated Glass Window Units Al Compaan (Toledo Solar)
15 9:10 AM 9:25 AM 3 Introduction to CTF SOLAR Bastian Siepchen (CTF SOLAR)
10 9:25 AM 9:35 AM 4 Update on Pilkington NA/NSG Activities Kevin Sanderson (NSG)
10 9:35 AM 9:45 AM 5 Introduction to Vitro Flat Glass James McCamy (Vitro Flat Glass)
10 9:45 AM 9:55 AM 6 Progress at nexTC Corporation Cory Perkins (nexTC)
10 9:55 AM 10:05 AM 7 Activation and incorporation of As in in-situ doped single-crystal CdTe on Si films grown via MBE Alex Goldstone (Sivananthan Labs)
10 10:05 AM 10:15 AM 8 Progress Report on CdTe Metrology Systems Greg Horner (Tau Sciences)
15 10:15 AM 10:30 AM Break
Research 1
20 10:30 AM 10:50 AM 1 Opportunities to increase Te supply Sarah Hayes (USGS)
20 10:50 AM 11:10 AM 2 Te recovery during Cu processing and opportunities for increasing Te supply from existing operations Michael Moats (Missouri S&T)
20 11:10 AM 11:30 AM 3 Monocrystalline CdSe for Si-based tandem applications: its potential and challenges Yong-Hang Zhang (ASU)
20 11:30 AM 11:50 AM 4 Ex-situ doping of CdTe using solution based processes Feng Yan (U Alabama)
20 11:50 AM 12:10 PM 5 Doping of CdTe single crystals P-type and N-type using P, As, Sb, In, Cl, I Santosh Swain (WSU)
75 12:10 PM 1:25 PM Lunch
Research 2
20 1:25 PM 1:45 PM 6 Distinguishing Bulk and Surface Recombination Using Ultrafast Spectroscopy and Modeling Jason Baxter (Drexel)
20 1:45 PM 2:05 PM 7 Characterization of CdTe interfaces Craig Perkins (NREL)
20 2:05 PM 2:25 PM 8 Modeling, machine learning, and characterization of defects and dopants in Cd(Se,Te) Maria K Chan (ANL)
20 2:25 PM 2:45 PM 9 Surface Photovoltage Spectroscopy to investigate back contacts Michael Scarpulla (U Utah)
20 2:45 PM 3:05 PM 10 Band Tails in Cd(Se,Te) Device Models Marco Nardone (BGSU)
20 3:05 PM 3:25 PM 11 Selenium Defects and Low Temperature Dynamics Mariana Bertoni (ASU)
15 3:25 PM 3:40 PM Break
Research 3
20 3:40 PM 4:00 PM 12 Understanding CdSe diffusion in CdTe solar cells Kurt L. Barth (Loughborough)
20 4:00 PM 4:20 PM 13 Progress in CdSeTe Absorber and Arsenic Doping W. S. Sampath (CSU)
20 4:20 PM 4:40 PM 14 Modeling of CdSeTe device properties and operation Dmitry Krasikov (FSLR)
20 4:40 PM 5:00 PM 15 Design and Fabrication of CdTe PERC Solar Cells Heayoung Yoon (U Utah)
20 5:00 PM 5:20 PM 16 20% CdS/CdSe/CdTe devices and other UT Progress Dengbing Li (UT)
20 5:20 PM 5:40 PM 17 Greening an already green technology – Embodied energy and carbon in CdTe and Si PV Matt Reese (NREL)
End of Day
Thursday Evening Dinner (at no charge, with a variety of food options including vegetarian and vegan) for all of you attending in person, to celebrate the CdTe PV community as well as our past and future successes. Dinner will follow immediately after the close of the Thursday afternoon schedule, and will be held at the Buehner Center at Oak Openings Metro Park: (directions from UToledo). Transportation will be via carpools (again, UToledo will have several additional drivers available for transport). The drive takes 30 minutes, and we strongly encourage a prompt departure from UT to improve the chances of seeing the park, perhaps by a short convenient hike, before dark. The food should be ready by about 7 pm, so we'll ideally have time for a beverage and/or a stroll.

Agenda Friday, Oct 21

Group A
(Roadmapping during morning session)
Group B
(Newer CdTe Researchers who registered for Plant Tours)
Initial Location UT Main Campus "R1" Building
2600 Dorr Street, Toledo, OH 43606
First Solar: 28380 Tracy Rd., Walbridge OH 43465
8:00 AM Breakfast @ R1 Building, First Floor Conference Room Breakfast at hotel or on your own, Group B* form carpools for transportation to First Solar and Toledo Solar
8:15 AM Roadmapping Kickoff/Charge (8:15 am)
Chair: Jim Sites
Presenters: Gang Xiong, Matt Reese, Aaron Bates, Mike Heben, and Amit Munshi
9:00 AM Breakout Sessions (9:00 - 10:45 am)
Group Leaders: Wyatt Metzger, Randy Ellingson, Craig Perkins, and Mike Scarpulla
Arrive at First Solar by 8:45 am for check-in
9:30 AM First Solar Plant Tour (approx. 60 minutes)
10:00 AM
10:30 AM Coffee Break (10:45 - 11:00 am) Arrive at Toledo Solar, approx. 10:30 am, for check-in
Toledo Solar: 1775 Progress Dr, Perrysburg, OH 43551
11:00 AM Super-Group Reconvenes -- Discussion (11 - Noon)
Chairs: Jim Sites and Matt Reese
11:30 AM
12:00 PM Lunch at Brady Center (R2 Building, same as Day 1) -- Both Groups
1:00 PM Group A* Depart for Tour at First Solar Continue lunch, discussion at Brady Center
1:30 PM Arrive (approx. 1:30-1:45 pm) at First Solar for check-in UToledo PVIC Labs Tour (R1 Building, just south of R2 and Brady Center)
2:00 PM First Solar Plant Tour (approx. 60 minutes) PVIC Labs Tour (approx. 60-90 minutes)
2:30 PM PVIC Tour
3:00 PM Arrive approx. 3:00 pm at Toledo Solar, 1775 Progress Dr, Perrysburg, OH 43551 PVIC Tour
3:30 PM Toledo Solar Plant Tour (approx. 60 minutes) Informal discussion, R1 PVIC
4:00 PM
4:30 PM End of Day
* Note that touring the manufacturing plants at First Solar and/or Toledo Solar requires that you registered in advance (deadline of Oct. 5th now passed).


Recommended Hotel

Hampton Inn and Suites, Toledo Westgate
3434 Secor Road
Toledo, OH 43606
phone: 419.214.5555

Workshop attendees wanting to stay at the Hampton Inn should call the hotel and ask for a reservation under the “University of Toledo CdTe Workshop”. Amenities include Free hot breakfast offered daily, Free high-speed and Wireless Internet access in the lobby and all guestrooms, and Guests have the option to earn both HHonors points & airline miles.

The room rate is $119 plus tax for a typical Oct. 19 arrival and Oct. 21 departure, and the hotel will give you the same rate if you want to add a night either before or after those dates. The standard King guest rooms have a King bed with a sleeper sofa and the standard doubles have two queen beds. There are King & Queen Suites available.

Event Location

Brady Center
1510 N Westwood Ave.
Toledo, OH 43606

Research and Technology Complex 1 “R1”
2600 Dorr St., Toledo, OH 43606


The most practical airport is Detroit Metropolitan (DTW) – approx. 1hr by ground transportation.
Rental vehicles, Uber/Lyft, and taxi are all options to consider (unfortunately there’s no dedicated shuttle).


Parking is allowed in Lot 20 (see map) next to R1 Building. Registering for parking is very important since, unfortunately, UToledo's parking is privatized, and the company is ruthless about collecting ~$50/day with no real possibility of appeal. To simplify things on our end at least, we have created a form to fill out once you have your vehicle information (can be done in advance, but otherwise ASAP please for those of you renting a vehicle -- you'll need the license plate info, State, Make, Model, Year, Color, etc.). If you have already completed the form previously posted on the website, no need to re-do that. Otherwise, please use the form below to enter your information, and Lisa at UToledo will enter your permit information into our parking system.


The University of Toledo is providing light breakfast and lunch on Thursday and Friday at the meeting venue (see Agenda).


A presentation laptop will be available, as will a laser pointer. Attendees are required to load their presentations onto a shared presentation laptop ahead of their assigned sessions (see Agenda).


Please contact us at the following e-mail address for assitance and general questions: cdte-workshop@utoledo.edu