Effect of Mesogenic Side Groups on the Redox, Photophysical, and Solar Cell Properties of Diketopyrrolopyrrole<i>-trans</i>-bis(diphosphine)diethynylplatinum(II) Polymers
Bibliographic record
Abstract
Three ([Pt]-DPP)n polymers PA, PB, and PC bearing cyanobiphenyl, alkyloxyphenyl, and triphenylene self-assembling groups were synthesized. The optical, electrochemical, photophysical, and solar cell properties were investigated and compared to analogue polymer P1 deprived of any organizing group. Significant differences lie in the more stabilized lowest unoccupied molecular orbital (LUMO) level for PA and the highest occupied molecular orbital (HOMO) level for PC. X-ray diffraction analyses on thin films evidenced π-aggregation of molecules for PA and PB. Nanosecond timescale fluorescent lifetimes were measured for PA, PB, and PC. An ultrafast photoinduced electron transfer between these polymers and phenyl-C61-butyric acid methyl ester (PC61BM) was brought out from femtosecond transient absorption spectroscopy (fs-TAS). It is faster for PC than for PA and PB. The recombination leads to singlet- and triplet-state formation (([Pt]-DPP)n)•+ + PC61BM•– → 3([Pt]-DPP)n* + ([Pt]-DPP)n + PC61BM. Solar cells were fabricated using polymers blended with an acceptor (PC71BM or IT-4F) as an active layer in conventional device structure indium tin oxide (ITO)/poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS)/active layer/poly[(9,9-dioctyl-2,7-fluorene)-alt-(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)] (PFN)/Al. Unlike PA, polymers PB and PC exhibit better photovoltaic performances than P1. Higher power conversion efficiencies (PCEs) were reached with IT-4F, PB:IT-4F (PCE = 10.83%, Jsc = 17.83 mA cm–2, Voc = 0.98 V), and PC:IT-4F (PCE = 13.26%, Jsc = 18.95 mA cm–2, Voc = 1.06 V). This work highlights the beneficial impact of triphenylene self-assembling groups on photovoltaic properties. PC exhibits a record-high PCE (13.26%) for [Pt]-containing polyyne oligomers and small molecules.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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 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".