Bimetallic Thermal Resists for Photomask, Micromachining and Microfabrication
Why this work is in the frame
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Bibliographic record
Abstract
Photoresists and photomasks are two of the most critical materials in microfabrication and micromachining industries. As the shift towards shorter wavelength exposure continues, conventional organic photoresists and chromelquartz photomasks start to encounter problems. This thesis investigates and presents an alternative to organic photoresists and chromium photomasks which overcomes their intrinsic problems. A bimetallic thin film, such as BilIn and SnIIn, creates an inorganic thermal resist with many interesting properties. Both experiments and simulations demonstrate that this class of thermal resists can be converted by laser exposure with wavelengths from 213 nm to 830 nm, showing wavelength invariance. Simulations of the projected wavelength response show that BiIIn thermal resist works down to the 1 nm X-ray range. Exposed bimetallic thermal resists can be developed in two different acid solutions with excellent selectivity. A standard etch (RCA2) can strip the unexposed bimetallic film when photoresist rework is needed. Exposed bimetallic films are resistant to Si anisotropic wet etching and fluorine, O2 and chlorine plasma etching. The Bi/In thermal resist is the first reported resist that works for both wet chemical anisotropic Si etching and dry plasma etching. All these features make the bimetallic film a complete thermal resist. Another very important property of bimetallic thin films is the largest change in the optical absorption ever reported in the literature (3.0 OD before exposure and 0.22 OD after exposure, 365 nm), with the exposed areas becoming nearly transparent. The transmission of the exposed films depends on the laser writing power. Thus, BilIn resist and its class can be utilized as a direct-write photomask material for both binary and grayscale photomasks. Binary photomasks and grayscale photomasks were successfully created. 2D and 3D structures were successfully generated in Shipley organic photoresists using a mercury lamp mask aligner with exposure conditions identical to those for conventional chrome masks. Material analyses show that the transformation after laser exposure of bimetallic thermal resists is an oxidation process. Laser-converted BilIn and S n h oxides have a structure similar to that of indium tin oxide films.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it