Alkyloxime-Substituted Thiophene-Based Wide-Band-Gap Polymer Donor Achieving a High Short Circuit Current Density of 30 mA cm<sup>–2</sup> in Organic Solar Cells
Bibliographic record
Abstract
A new polymer TTOTCl with a repeat unit consisting of a chlorinated thienyl-substituted benzo[1,2- b:4,5- b ′]dithiophene (BDTCl) donor unit, a thiophene spacer, and an alkyloxime-substituted thiophene (TO) acceptor unit is reported as a wide-band-gap donor for nonfullerene acceptor-based organic solar cells (OSCs). The optical band gap ( E g opt = 1.97 eV), the highest occupied molecular orbital (HOMO) energy level ( E HOMO = −5.48 eV), and the lowest unoccupied molecular orbital (LUMO) energy level ( E LUMO = −3.51 eV) of TTOTCl match well with the nonfullerene acceptor Y6 ( E g opt = 1.33 eV; E HOMO = −5.65 eV; E LUMO = −4.10 eV). TTOTCl also showed a high space charge-limited current (SCLC) hole mobility of 1.36 × 10 –3 cm 2 V –1 s –1 . OSCs using TTOTCl as the donor and Y6 as the acceptor achieved a high power conversion efficiency (PCE) of up to 14.42% with a record high J sc of 30.00 mA cm –2 along with a V oc of 0.70 V and a fill factor (FF) of 0.68. The PCE was further improved to 15.43% using a hole transport enhancement layer, with an enhanced V oc and FF of 0.72 V and 0.71, respectively. The unencapsulated OSC device showed excellent long-term stability in ambient air with a 90.4% retention in the PCE over 30 days.
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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".