Sidechain‐Engineered N‐PDIs Processed from Ethyl Acetate as Effective Cathode Interlayers for Organic Solar Cells
Bibliographic record
Abstract
Herein, series bay position‐substituted N‐annulated perylene diimide (N‐PDI) derivatives applied as the cathode interlayer (CIL) in bottom‐anode (conventional structure) organic solar cells (OSCs) are presented. Despite the fact that N‐PDIs show low solubility in common CIL‐processing solvents such as methanol (MeOH), the use of ethyl acetate (EtOAc) as a processing solvent allows for dissolution of N‐PDIs at sufficient concentrations to form homogeneous films on top of the organic photoactive layer. OSC devices fabricated in ambient conditions using the PM6:Y6 representative bulk heterojunction (BHJ) system show simultaneous enhancements in performance metrics, with power conversion efficiency (PCE) increasing from 8.5% for devices based on the bare Ag cathode to 12.5% with N‐PDI molecule as CIL. The improvement in performance with N‐PDI CILs can be attributed to a combination of smooth film morphology and high electron extraction capability of N‐PDIs. Solubility in EtOAc, appropriate highest occupied molecular orbital/lowest unoccupied molecular orbital energy levels, uniform film formation, and facilitation of electron transfer/collection make these N‐PDIs a promising family of CIL materials for efficient OSCs. Using EtOAc as an improved solvent over MeOH also opens the door for new CIL designs and to test materials that are not MeOH soluble.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".