3,6-Dithiophen-2-yl-diketopyrrolo[3,2-<i>b</i>]pyrrole (isoDPPT) as an Acceptor Building Block for Organic Opto-Electronics
Bibliographic record
Abstract
The electron acceptor building block for π-conjugated copolymers, 3,6-dithiophen-2-yl-diketopyrrolo[3,2- b ]pyrrole (isoDPPT), was synthesized following two routes. The comparison between isoDPPT and widely investigated 3,6-dithiophen-2-yl-diketopyrrolo[3,4- c ]pyrrole (DPPT) in terms of molecular orbital computations, single crystal X-ray diffraction, optical absorption and cyclic voltammogram was utilized to elucidate structural and electronic structure differences between the two cores. Both units are found to be planar in the solid state, exhibit similar LUMO energy, however, isoDPPT exhibits a much deeper HOMO energy. Six isoDPPT-based polymers with optical bandgaps spanning from 1.44 to 1.76 eV were synthesized by copolymerizing isoDPPT with the following building blocks: 2,2′-bithiophene (for P1 ), 4,4′-bis(2-ethylhexyl)-dithieno[3,2- b:2′,3′- d ]silole (for P2 ), 3,3‴-didodecylquaterthiophene (for P3 ), 4,8-didodecylbenzo[1,2- b:4,5- b ′]dithiophene (for P4 ), 4,8-didodecyloxybenzo[1,2- b:4,5- b ′]dithiophene (for P5 ) and 3,3′-bis(dodecyloxy)-2,2′-bithiophene (for P6 ). Field-effect transistors and bulk heterojunction solar cells based on isoDPPT copolymers were fabricated and the response compared vis-a-vis to those of some DPPT-based polymers. Hole mobility (μ h ) of 0.03 cm 2 /(V·s) and solar cell power conversion efficiency (PCE) of 5.1% were achieved for polymer P2.
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How this classification was reachedexpand
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) | 0.001 | 0.001 |
| 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 teacher head, 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".