Question
Chloro·benzene is used as an antisolvent during this process to improve the crystallinity of perov·skite solar cells. For 10 points each:
[10h] Name this technique of preparing thin films by centrifuging a volatile ink that spreads out and dries on the target substrate. It is an easy way to make photo·resists for micro·fabrication.
ANSWER: spin coating [or spin casting; prompt on coating or casting]
[10e] Painting with perov·skite inks is far easier than the traditional method of making photo·voltaic silicon: the “chemical vapor” form of this phase transition from a gas to a solid.
ANSWER: deposition [or desublimation; or depositing; accept chemical vapor deposition; prompt on CVD by asking “what does that stand for?”]
[10m] Due to its toxicity, chloro·benzene is being phased out as an antisolvent in favor of this greener organic solvent. This ester is the product when a two-carbon alcohol condenses with a two-carbon carboxylic acid.
ANSWER: ethyl acetate [or EA; or ethyl ethanoate or EtOAc; or ETAC]
<Chemistry>
Summary
| 2023 ACF Nationals | 04/22/2023 | Y | 24 | 10.83 | 96% | 8% | 4% |
Data
| Brown A | WUSTL A | 0 | 10 | 0 | 10 |
| Duke A | Chicago B | 10 | 10 | 0 | 20 |
| Rutgers B | Columbia B | 0 | 10 | 0 | 10 |
| Cornell A | Stanford A | 0 | 10 | 10 | 20 |
| Cornell B | Toronto A | 0 | 10 | 0 | 10 |
| Yale A | Florida A | 0 | 10 | 0 | 10 |
| Florida B | Johns Hopkins A | 0 | 10 | 10 | 20 |
| Houston A | Michigan A | 0 | 10 | 0 | 10 |
| Claremont A | Iowa State A | 0 | 10 | 0 | 10 |
| MIT A | Minnesota A | 0 | 10 | 0 | 10 |
| Maryland A | Georgia Tech A | 0 | 10 | 0 | 10 |
| Minnesota B | Purdue A | 0 | 10 | 0 | 10 |
| NYU A | Imperial A | 0 | 10 | 0 | 10 |
| Chicago C | North Carolina A | 0 | 10 | 0 | 10 |
| UC Berkeley A | Northwestern A | 0 | 10 | 0 | 10 |
| South Carolina A | McGill A | 0 | 0 | 0 | 0 |
| Indiana A | Texas A | 0 | 10 | 0 | 10 |
| UC Berkeley B | Vanderbilt A | 0 | 10 | 0 | 10 |
| Penn State A | Virginia A | 0 | 10 | 0 | 10 |
| Rutgers A | WUSTL B | 0 | 10 | 0 | 10 |
| Georgia Tech B | Yale B | 0 | 10 | 0 | 10 |
| Chicago A | Ohio State A | 0 | 10 | 0 | 10 |
| Harvard A | Columbia A | 0 | 10 | 0 | 10 |
| Penn A | Illinois A | 0 | 10 | 0 | 10 |