Question
In the second-most common design for photovoltaic thin films, copper indium gallium selenide lies below a window layer of this element’s sulfide. For 10 points each:
[10m] Name this element that is [emphasize] directly bonded to tellurium in the most common photovoltaic thin film.
ANSWER: cadmium [or Cd]
[10e] The cadmium sulfide layer in a CIGS (“sigs”) solar cell lies underneath a conducting film of tin oxide that has this optical property. Indium tin oxide is used in electronics because it has this property of transmitting nearly all light.
ANSWER: transparent [or transparency; accept transparent conducting oxides]
[10h] The third-most common photovoltaic thin film absorber is amorphous silicon that has undergone this process to remove dangling bonds. Chemical formulas represent silicon that has undergone this process as: “Si,” then a colon, then a capital letter.
ANSWER: hydrogenation [or hydrogen incorporation or hydrogen impregnation; or alloying with hydrogen; accept any descriptions of the addition of hydrogen or H; accept hydrogenated amorphous silicon; prompt on reduction or word forms of reduce; prompt on passivation or word forms of passive or passivate]
Data
| Team | Opponent | Part 1 | Part 2 | Part 3 | Total |
|---|---|---|---|---|---|
| Brown A | Georgia Tech B | 0 | 10 | 0 | 10 |
| Chicago A | Vanderbilt A | 0 | 10 | 0 | 10 |
| Chicago B | Cornell A | 0 | 10 | 0 | 10 |
| Chicago C | Georgia Tech A | 10 | 10 | 10 | 30 |
| Claremont A | Minnesota B | 0 | 0 | 0 | 0 |
| Columbia A | Yale A | 0 | 10 | 0 | 10 |
| Columbia B | Toronto A | 0 | 10 | 10 | 20 |
| Cornell B | Northwestern A | 10 | 10 | 0 | 20 |
| Duke A | Illinois A | 0 | 10 | 0 | 10 |
| Houston A | Harvard A | 0 | 0 | 0 | 0 |
| Iowa State A | UC Berkeley A | 0 | 10 | 0 | 10 |
| Maryland A | Penn A | 0 | 10 | 0 | 10 |
| McGill A | Rutgers B | 0 | 0 | 0 | 0 |
| Michigan A | Florida B | 0 | 0 | 10 | 10 |
| North Carolina A | Virginia A | 10 | 10 | 0 | 20 |
| Ohio State A | WUSTL B | 0 | 10 | 0 | 10 |
| Penn State A | MIT A | 0 | 10 | 0 | 10 |
| Rutgers A | Minnesota A | 0 | 0 | 0 | 0 |
| Stanford A | NYU A | 0 | 0 | 0 | 0 |
| UC Berkeley B | Texas A | 0 | 10 | 0 | 10 |
| WUSTL A | Purdue A | 10 | 10 | 0 | 20 |
| Yale B | Indiana A | 10 | 10 | 0 | 20 |