MRS Fall 2017 Symposium: Organic Semiconductors—Surface, Interface, Bulk Doping, and Charge Transport
Bibliographic record
Abstract
Fall Meeting of the Materials Research Society (MRS), held annually in Boston, is the prime venue for researchers from around the world to discuss the latest advances and developments in materials science and beyond.The 2017 meeting hosted awith over 200 abstracts exceptionally well attended, five day symposium dedicated to doping and charge transport of organic semiconductors (OSCs).The symposium brought together current theoretical and experimental viewpoints from physics, chemistry, and materials science, examining both the fundamental processes underlying the doping of OSCs, as well as pathways to capitalize on their potential in organic electronics.23 invited speakers from 10 different countries (Table 1) led a stimulating interdisciplinary discussion in 7 clear-cut thematic sessions, with a further 68 contributed talks and 118 posters shown within two poster events.The thematic sessions covered both subject areas that were fundamental in nature, such as structure-property relationships, synthetic aspects, interface vs bulk doping, as well as topics with an explicit application focus, such as well-established but also emerging areas like organic photovoltaics and transistors, perovskite solar cells, thermoelectrics, electrochemical transistors, electrochromic devices, organic electronic textiles, etc.Karl Leo opened the symposium by providing a comprehensive overview of key aspects of OSCs, and their application in organic electronics, starting with a recent study on exploiting charge-transfer absorptions in near-infrared photodetectors, 1 and discussing new insights into the role of disorder for charge separation in doped OSCs after initial charge transfer. 2He further highlighted the role of (deep) traps and discussed the processes of trap filling for both n-and pdoping 3 a recurring topic of the symposium.Nobuo Ueno discussed general aspects of gap states in OSCs, as studied by high-sensitivity photoelectron spectroscopy, 4 and Frank Ortmann presented novel aspects of n-doping C 60 by combining direct and (low-energy) inverse photoelectron spectroscopy with theoretical modeling.Ortmann proposed the energy difference between the electron affinity of the pristine OSC and the ionization energy of the n-doped material as the key parameter for the doping process. 5Novel strategies for n-doping OSCs and, in particular, for overcoming the intrinsic susceptibility of n-dopants to oxidation were discussed in detail by Stephen Barlow, Xin Lin, and Antoine Kahn, who all reported the successful photoactivation of cleavable airstable dimeric dopants to allow for high efficiency OLEDs. 6nvironmental stability and the (unintentional) doping of OSCs by impurities were addressed by Mark Nikolka, who presented a study on organic field-effect transistors (OFETs) that not only identified the detrimental role of water incorporated into voids of the active layer but also demonstrated how to overcome this effect by substituting water with inert molecular additives. 7Henning Sirringhaus deepened this discussion and presented recent work on the interplay between microstructure and carrier mobility in conjugated polymers and the role of water as a trap in pchannel transistors.Altering the peripheral substitution pattern allows for high-mobility OFETs, 8 as does the close stacking of copolymer backbones. 9n general, the microstructure of doped OSCs was a leitmotif of numerous contributions in the symposium.In this regard, Alberto Salleo and Adam Moulédiscussed the prototypical system of poly(3-hexylthiophene) (P3HT) sequentially doped with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ), 10,11 an approach likewise reported by Dieter Neher who employed a strong Lewis acid. 12In all cases, they reported sequential doping to be a reliable pathway for overcoming solubility issues and achieving doped polymer films of superior morphology.Notably, based on inelastic neutron scattering and theoretical modeling, Mouléproposed a structural motif for F4TCNQ-doped P3HT with dopants intercalated between the polymer chains. 13Improved dopant
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.000 | 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) | 0.005 | 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".