Ion-implanted PERC Solar Cells with Al2O3/SiNx Rear Passivation
Why this work is in the frame
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Bibliographic record
Abstract
Ion implantation is an attractive candidate for PERC solar cells due to the single-sided emitter phosphorus doping. The oxide, which is formed during the implant anneal, can be used as rear passivation of PERC cells. However, the SiO 2 /SiN x rear passivation is very sensitive to the rear surface roughness and surface preparation. Hence, in this paper we evaluate Al 2 O 3 /SiN x rear passivation layers in combination with an oxide passivated ion-implanted emitter. We obtain emitter saturation current densities of 93 fA/cm 2 , which is significantly lower compared to a typical POCl 3 diffused emitter with 140 fA/cm 2 . Ion-implanted PERC cells with Al 2 O 3 /SiN x rear passivation show conversion efficiencies up to 20.0% which is comparable to POCl 3 -diffused PERC cells. The emitter dopant profile can be adjusted by the thermal budget of the anneal in order to optimize the process window between J sc and FF losses. The IQE and reflectance of implanted and POCl 3 -diffused PERC cells in the long wavelength regime are almost identical which demonstrates the successful implementation of the Al 2 O 3 /SiN x rear passivation to PERC cells with ion-implanted emitters. Future work will focus on simplifying the process flow in order to obtain a lean industrially manufacturable PERC process, leveraging the single side doping via ion implantation.
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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 | 0.000 | 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