Pub Date : 2022-12-21DOI: 10.1088/2515-7639/acada2
Mehrad Ahmadpour, M. Prete, Um Kanta Aryal, A. U. Petersen, Mariam Ahmad, H.-G. Rubahn, Malte F. Jespersen, K. Mikkelsen, V. Turkovic, M. Nielsen, M. Madsen
A boron subphthalocyanine molecule has been employed as a novel electron donor in organic solar cells (OPVs), and optimized in terms of composition and device structure in small molecule solar cells. It is demonstrated that the power conversion efficiency (PCE) of the devices obtained by solution-processing in bulk heterojunction solar cells could be improved by one order of magnitude by changing the fabrication method to vacuum deposition, which promotes a better morphology in the OPV active layers. Importantly, upon insertion of an additional pristine C70 thin interlayer between the active layer and the hole transport layer the PCE was further improved, highlighting the importance of interfacial layer engineering in such subphthalocyanine small molecule OPVs.
{"title":"Device engineering of organic solar cells based on a boron subphthalocyanine electron donor molecule","authors":"Mehrad Ahmadpour, M. Prete, Um Kanta Aryal, A. U. Petersen, Mariam Ahmad, H.-G. Rubahn, Malte F. Jespersen, K. Mikkelsen, V. Turkovic, M. Nielsen, M. Madsen","doi":"10.1088/2515-7639/acada2","DOIUrl":"https://doi.org/10.1088/2515-7639/acada2","url":null,"abstract":"A boron subphthalocyanine molecule has been employed as a novel electron donor in organic solar cells (OPVs), and optimized in terms of composition and device structure in small molecule solar cells. It is demonstrated that the power conversion efficiency (PCE) of the devices obtained by solution-processing in bulk heterojunction solar cells could be improved by one order of magnitude by changing the fabrication method to vacuum deposition, which promotes a better morphology in the OPV active layers. Importantly, upon insertion of an additional pristine C70 thin interlayer between the active layer and the hole transport layer the PCE was further improved, highlighting the importance of interfacial layer engineering in such subphthalocyanine small molecule OPVs.","PeriodicalId":16520,"journal":{"name":"Journal of Nonlinear Optical Physics & Materials","volume":"24 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82561337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-21DOI: 10.1088/2515-7639/acada1
João Rocha Maia, R. Sobreiro‐Almeida, F. Cleymand, J. Mano
Three-dimensional printing has risen in recent years as a promising approach that fast-tracked the biofabrication of tissue engineering constructs that most resemble utopian tissue/organ replacements for precision medicine. Additionally, by using human-sourced biomaterials engineered towards optimal rheological proprieties of extrudable inks, the best possible scaffolds can be created. These can encompass native structure and function with a low risk of rejection, enhancing overall clinical outcomes; and even be further optimized by engaging in information- and computer-driven design workflows. This paper provides an overview of the current efforts in achieving ink’s necessary rheological and print performance proprieties towards biofabrication from human-derived biomaterials. The most notable step for arranging such characteristics to make biomaterials inks are the employed crosslinking strategies, for which examples are discussed. Lastly, this paper illuminates the state-of-the-art of the most recent literature on already used human-sourced inks; with a final emphasis on future perspectives on the field.
{"title":"Biomaterials of human source for 3D printing strategies","authors":"João Rocha Maia, R. Sobreiro‐Almeida, F. Cleymand, J. Mano","doi":"10.1088/2515-7639/acada1","DOIUrl":"https://doi.org/10.1088/2515-7639/acada1","url":null,"abstract":"Three-dimensional printing has risen in recent years as a promising approach that fast-tracked the biofabrication of tissue engineering constructs that most resemble utopian tissue/organ replacements for precision medicine. Additionally, by using human-sourced biomaterials engineered towards optimal rheological proprieties of extrudable inks, the best possible scaffolds can be created. These can encompass native structure and function with a low risk of rejection, enhancing overall clinical outcomes; and even be further optimized by engaging in information- and computer-driven design workflows. This paper provides an overview of the current efforts in achieving ink’s necessary rheological and print performance proprieties towards biofabrication from human-derived biomaterials. The most notable step for arranging such characteristics to make biomaterials inks are the employed crosslinking strategies, for which examples are discussed. Lastly, this paper illuminates the state-of-the-art of the most recent literature on already used human-sourced inks; with a final emphasis on future perspectives on the field.","PeriodicalId":16520,"journal":{"name":"Journal of Nonlinear Optical Physics & Materials","volume":"101 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77268990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-14DOI: 10.1088/2515-7639/acab89
S. Hayami
We theoretically investigate the stability of a rectangular skyrmion crystal without fourfold rotational symmetry under an orthorhombic distortion in centrosymmetric tetragonal magnets. The results are obtained by numerically simulated annealing for an effective spin model with competing interactions in momentum space and magnetic anisotropy. By constructing the low-temperature phase diagram while changing the interaction ratio arising from the orthorhombic distortion, we find that the rectangular skyrmion crystal remains stable in an external magnetic field against distortion. We show that the degree of fourfold rotational symmetry tends to recover when the magnetic field is increased. The relevance to the skyrmion-hosting material EuAl4 is also discussed.
{"title":"Orthorhombic distortion and rectangular skyrmion crystal in a centrosymmetric tetragonal host","authors":"S. Hayami","doi":"10.1088/2515-7639/acab89","DOIUrl":"https://doi.org/10.1088/2515-7639/acab89","url":null,"abstract":"We theoretically investigate the stability of a rectangular skyrmion crystal without fourfold rotational symmetry under an orthorhombic distortion in centrosymmetric tetragonal magnets. The results are obtained by numerically simulated annealing for an effective spin model with competing interactions in momentum space and magnetic anisotropy. By constructing the low-temperature phase diagram while changing the interaction ratio arising from the orthorhombic distortion, we find that the rectangular skyrmion crystal remains stable in an external magnetic field against distortion. We show that the degree of fourfold rotational symmetry tends to recover when the magnetic field is increased. The relevance to the skyrmion-hosting material EuAl4 is also discussed.","PeriodicalId":16520,"journal":{"name":"Journal of Nonlinear Optical Physics & Materials","volume":"37 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81398044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-14DOI: 10.1088/2515-7639/acab88
G. Ciofani, M. Campisi, C. Mattu, R. Kamm, V. Chiono, A. M. Raynold, J. S. Freitas, Eugenio Redolfi Riva, S. Micera, C. Pucci, F. Novio, J. Lorenzo, D. Ruíz-Molina, Giulia Sierri, F. Re, Hannah Wunderlich, Prachi Kumari, K. Kozielski, Mounia Chami, Attilio Marino, Lino Ferreira
In recent years, a great deal of effort has been undertaken with regards to treatment of pathologies at the level of the central nervous system (CNS). Here, the presence of the blood-brain barrier acts as an obstacle to the delivery of potentially effective drugs and makes accessibility to, and treatment of, the CNS one of the most significant challenges in medicine. In this Roadmap article, we present the status of the timeliest developments in the field, and identify the outstanding challenges and opportunities that exist. The format of the Roadmap, whereby experts in each discipline share their viewpoint and present their vision, reflects the dynamic and multidisciplinary nature of this research area, and is intended to generate dialogue and collaboration across traditional subject areas. It is stressed here that this article is not intended to act as a comprehensive review article, but rather an up-to-date and forward-looking summary of research methodologies pertaining to the treatment of pathologies at the level of the CNS.
{"title":"Roadmap on nanomedicine for the central nervous system","authors":"G. Ciofani, M. Campisi, C. Mattu, R. Kamm, V. Chiono, A. M. Raynold, J. S. Freitas, Eugenio Redolfi Riva, S. Micera, C. Pucci, F. Novio, J. Lorenzo, D. Ruíz-Molina, Giulia Sierri, F. Re, Hannah Wunderlich, Prachi Kumari, K. Kozielski, Mounia Chami, Attilio Marino, Lino Ferreira","doi":"10.1088/2515-7639/acab88","DOIUrl":"https://doi.org/10.1088/2515-7639/acab88","url":null,"abstract":"In recent years, a great deal of effort has been undertaken with regards to treatment of pathologies at the level of the central nervous system (CNS). Here, the presence of the blood-brain barrier acts as an obstacle to the delivery of potentially effective drugs and makes accessibility to, and treatment of, the CNS one of the most significant challenges in medicine. In this Roadmap article, we present the status of the timeliest developments in the field, and identify the outstanding challenges and opportunities that exist. The format of the Roadmap, whereby experts in each discipline share their viewpoint and present their vision, reflects the dynamic and multidisciplinary nature of this research area, and is intended to generate dialogue and collaboration across traditional subject areas. It is stressed here that this article is not intended to act as a comprehensive review article, but rather an up-to-date and forward-looking summary of research methodologies pertaining to the treatment of pathologies at the level of the CNS.","PeriodicalId":16520,"journal":{"name":"Journal of Nonlinear Optical Physics & Materials","volume":"1985 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90326374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A series of polyimide (PI)/SiO2 aerogel microspheres were prepared by using polyamide acid salt and hydrolyzed tetraethyl orthosilicate based on the reverse-phase emulsion method. Then, PI/SiO2 aerogel microspheres were carbonized and etched to obtain carbon aerogel microspheres (CAMs). Scanning electron microscope, transmission electron microscope and nitrogen isothermal adsorption were used to characterize the micro-morphology and pore structure of the microspheres; and electrochemical workstation was used to test the electrochemical performance of the CAMs. The results showed that CAMs with different pore structures and specific surface area were obtained by adjusting the content of SiO2. Highest specific surface area of 1166.9 m2 g−1 and a total pore volume of 1.2369 cm3 g−1 were achieved at a SiO2 content of 50%. When used as the electrode materials for supercapacitors, these CAMs demonstrated a maximum specific capacitance of 125.1 F g−1 in a three-electrode system and a maximum capacitance of 53.3% at 30 A g−1. This article provides a new strategy for the preparation of CAMs with high specific surface area by using linear PI precursor and SiO2 support skeleton.
以聚酰胺酸盐和水解正硅酸四乙酯为原料，采用反相乳化法制备了一系列聚酰亚胺/二氧化硅气凝胶微球。然后对PI/SiO2气凝胶微球进行碳化和蚀刻，得到碳气凝胶微球(CAMs)。采用扫描电镜、透射电镜和氮气等温吸附对微球的微观形貌和孔隙结构进行表征;电化学工作站对cam的电化学性能进行了测试。结果表明:通过调整SiO2的含量，可以得到具有不同孔结构和比表面积的cam;SiO2含量为50%时，其最大比表面积为1166.9 m2 g−1，总孔容为1.2369 cm3 g−1。当用作超级电容器的电极材料时，这些cam在三电极系统中的最大比电容为125.1 F g−1，在30 a g−1时的最大比电容为53.3%。本文提出了一种利用线性PI前驱体和SiO2支撑骨架制备高比表面积cam的新策略。
{"title":"Fabrication of high-surface-area, SiO2 supported polyimide carbon aerogel microspheres: electrochemical application","authors":"Shin-Chih Liu, Jianqi Ji, Yixing Wang, Cenqi Yan, Huitao Bai, Jiaqiang Qin, Pei Cheng","doi":"10.1088/2515-7639/acaa59","DOIUrl":"https://doi.org/10.1088/2515-7639/acaa59","url":null,"abstract":"A series of polyimide (PI)/SiO2 aerogel microspheres were prepared by using polyamide acid salt and hydrolyzed tetraethyl orthosilicate based on the reverse-phase emulsion method. Then, PI/SiO2 aerogel microspheres were carbonized and etched to obtain carbon aerogel microspheres (CAMs). Scanning electron microscope, transmission electron microscope and nitrogen isothermal adsorption were used to characterize the micro-morphology and pore structure of the microspheres; and electrochemical workstation was used to test the electrochemical performance of the CAMs. The results showed that CAMs with different pore structures and specific surface area were obtained by adjusting the content of SiO2. Highest specific surface area of 1166.9 m2 g−1 and a total pore volume of 1.2369 cm3 g−1 were achieved at a SiO2 content of 50%. When used as the electrode materials for supercapacitors, these CAMs demonstrated a maximum specific capacitance of 125.1 F g−1 in a three-electrode system and a maximum capacitance of 53.3% at 30 A g−1. This article provides a new strategy for the preparation of CAMs with high specific surface area by using linear PI precursor and SiO2 support skeleton.","PeriodicalId":16520,"journal":{"name":"Journal of Nonlinear Optical Physics & Materials","volume":"20 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81178581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-07DOI: 10.1088/2515-7639/aca71c
J. Hidding, Sytze H Tirion, J. Momand, A. Kaverzin, M. Mostovoy, B. V. van Wees, B. Kooi, M. Guimarães
Upon further analysis of the data
根据对数据的进一步分析
{"title":"Corrigendum: Interfacial spin–orbit torques and magnetic anisotropy in WSe2/permalloy bilayers (2021 J. Phys. Mater. 4 04LT01)","authors":"J. Hidding, Sytze H Tirion, J. Momand, A. Kaverzin, M. Mostovoy, B. V. van Wees, B. Kooi, M. Guimarães","doi":"10.1088/2515-7639/aca71c","DOIUrl":"https://doi.org/10.1088/2515-7639/aca71c","url":null,"abstract":"Upon further analysis of the data","PeriodicalId":16520,"journal":{"name":"Journal of Nonlinear Optical Physics & Materials","volume":"8 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87513633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-06DOI: 10.1088/2515-7639/aca936
Meiying Liang, Ji Liu, Ailis O'Shea, V. Nicolosi
Lithium-ion batteries (LIBs) with silicon microparticle anodes provide a high capacity, low cost, low environmental impact, and ease of production. However, the rapid capacity degradation and low Coulombic efficiency (CE) are impediments to their further development and commercialization, which are mainly caused by large volume variation and unstable solid–electrolyte interface (SEI) of silicon. To break this bottleneck, here, we demonstrate that designing silicon microparticles with nanoporous structure (PSi) and confining the PSi in the carbon nanotube (CNT) segregated network can effectively suppress the volume expansion of silicon, enabling the fabrication of high-performance electrodes. The rate capability and cycling performance of the electrode are further improved by creating a hierarchical open porous structure for the PSi-CNT composite anodes via freeze drying. In addition, the mixTHF electrolyte was employed to get a thin and uniform SEI, which can reduce the breakage of SEI during cycling and improve the CE and stability of the LIBs. As a result, the PSi-CNT composite anode delivers a high specific capacity of 3210.1 mAh g−1 at 1/15 °C rate and an initial Coulombic efficiency of 87.3%. After 100 cycles, the capacity could be maintained at over 2000 mAh g−1 with 99.5% CE. In addition, hierarchical porous structured PSi-CNT composites exhibit excellent rate performance, the specific capacity could reach 2264.5 mAh g−1 at 5 °C rate. The work suggests several effective solutions that could be used to facilitate the future commercialization of silicon anodes.
具有硅微粒阳极的锂离子电池(lib)具有高容量、低成本、低环境影响和易于生产的特点。然而，由于硅的体积变化大、固液界面不稳定，导致容量退化快、库仑效率低，阻碍了其进一步发展和商业化。为了打破这一瓶颈，我们证明了设计具有纳米孔结构(PSi)的硅微粒并将PSi限制在碳纳米管(CNT)隔离网络中可以有效抑制硅的体积膨胀，从而实现高性能电极的制造。通过冷冻干燥为PSi-CNT复合阳极创建分层开放多孔结构，进一步提高了电极的速率能力和循环性能。此外，采用混合thf电解液制备了薄而均匀的SEI，减少了SEI在循环过程中的断裂，提高了lib的CE和稳定性。因此，PSi-CNT复合阳极在1/15°C的速率下具有3210.1 mAh g - 1的高比容量和87.3%的初始库仑效率。经过100次循环后，电池容量可保持在2000 mAh g−1以上，CE为99.5%。此外，层次化多孔结构PSi-CNT复合材料表现出优异的倍率性能，在5°C倍率下比容量可达到2264.5 mAh g−1。这项工作提出了几种有效的解决方案，可用于促进硅阳极的未来商业化。
{"title":"Constructing hierarchical porous structure in microsized silicon/carbon nanotubes composite anode with LiF-rich solid-electrolyte interfaces for highly stable lithium-ion batteries","authors":"Meiying Liang, Ji Liu, Ailis O'Shea, V. Nicolosi","doi":"10.1088/2515-7639/aca936","DOIUrl":"https://doi.org/10.1088/2515-7639/aca936","url":null,"abstract":"Lithium-ion batteries (LIBs) with silicon microparticle anodes provide a high capacity, low cost, low environmental impact, and ease of production. However, the rapid capacity degradation and low Coulombic efficiency (CE) are impediments to their further development and commercialization, which are mainly caused by large volume variation and unstable solid–electrolyte interface (SEI) of silicon. To break this bottleneck, here, we demonstrate that designing silicon microparticles with nanoporous structure (PSi) and confining the PSi in the carbon nanotube (CNT) segregated network can effectively suppress the volume expansion of silicon, enabling the fabrication of high-performance electrodes. The rate capability and cycling performance of the electrode are further improved by creating a hierarchical open porous structure for the PSi-CNT composite anodes via freeze drying. In addition, the mixTHF electrolyte was employed to get a thin and uniform SEI, which can reduce the breakage of SEI during cycling and improve the CE and stability of the LIBs. As a result, the PSi-CNT composite anode delivers a high specific capacity of 3210.1 mAh g−1 at 1/15 °C rate and an initial Coulombic efficiency of 87.3%. After 100 cycles, the capacity could be maintained at over 2000 mAh g−1 with 99.5% CE. In addition, hierarchical porous structured PSi-CNT composites exhibit excellent rate performance, the specific capacity could reach 2264.5 mAh g−1 at 5 °C rate. The work suggests several effective solutions that could be used to facilitate the future commercialization of silicon anodes.","PeriodicalId":16520,"journal":{"name":"Journal of Nonlinear Optical Physics & Materials","volume":"15 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75443777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-02DOI: 10.1088/2515-7639/aca82f
Jakob Lenz, M. Statz, K. Watanabe, T. Taniguchi, F. Ortmann, R. Weitz
Even though charge transport in semiconducting polymers is of relevance for a number of potential applications in (opto-)electronic devices, the fundamental mechanism of how charges are transported through organic polymers that are typically characterized by a complex nanostructure is still open. One of the challenges which we address here, is how to gain controllable experimental access to charge transport at the sub-100 nm lengthscale. To this end charge transport in single poly(diketopyrrolopyrrole-terthiophene) fiber transistors, employing two different solid gate dielectrics, a hybrid Al2O3/self-assembled monolayer and hexagonal boron nitride, is investigated in the sub-50 nm regime using electron-beam contact patterning. The electrical characteristics exhibit near ideal behavior at room temperature which demonstrates the general feasibility of the nanoscale contacting approach, even though the channels are only a few nanometers in width. At low temperatures, we observe nonlinear behavior in the current–voltage characteristics in the form of Coulomb diamonds which can be explained by the formation of an array of multiple quantum dots at cryogenic temperatures.
{"title":"Charge transport in single polymer fiber transistors in the sub-100 nm regime: temperature dependence and Coulomb blockade","authors":"Jakob Lenz, M. Statz, K. Watanabe, T. Taniguchi, F. Ortmann, R. Weitz","doi":"10.1088/2515-7639/aca82f","DOIUrl":"https://doi.org/10.1088/2515-7639/aca82f","url":null,"abstract":"Even though charge transport in semiconducting polymers is of relevance for a number of potential applications in (opto-)electronic devices, the fundamental mechanism of how charges are transported through organic polymers that are typically characterized by a complex nanostructure is still open. One of the challenges which we address here, is how to gain controllable experimental access to charge transport at the sub-100 nm lengthscale. To this end charge transport in single poly(diketopyrrolopyrrole-terthiophene) fiber transistors, employing two different solid gate dielectrics, a hybrid Al2O3/self-assembled monolayer and hexagonal boron nitride, is investigated in the sub-50 nm regime using electron-beam contact patterning. The electrical characteristics exhibit near ideal behavior at room temperature which demonstrates the general feasibility of the nanoscale contacting approach, even though the channels are only a few nanometers in width. At low temperatures, we observe nonlinear behavior in the current–voltage characteristics in the form of Coulomb diamonds which can be explained by the formation of an array of multiple quantum dots at cryogenic temperatures.","PeriodicalId":16520,"journal":{"name":"Journal of Nonlinear Optical Physics & Materials","volume":"115 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80858186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-29DOI: 10.1088/2515-7639/aca71e
Hannes Hase, Melissa Berteau-Rainville, Somaiyeh Charoughchi, W. Bodlos, E. Orgiu, I. Salzmann
The conjugated polymer poly(3-hexylthiophene) (P3HT) p-doped with the strong acceptor tetrafluorotetracyanoquinodimethane (F4TCNQ) is known to undergo ion-pair (IPA) formation, i.e. integer-charge transfer, and, as only recently reported, can form ground state charge-transfer complexes (CPXs) as a competing process, yielding fractional charge transfer. As these fundamental charge-transfer phenomena differently affect doping efficiency and, thus, organic-semiconductor device performance, possible factors governing their occurrence have been under investigation ever since. Here, we focus on the role of a critical dopant concentration deciding over IPA- or CPX-dominated regimes. Employing a broad, multi-technique approach, we compare the doping of P3HT by F4TCNQ and its weaker derivatives F2TCNQ, FTCNQ, and TCNQ, combining experiments with semi-classical modeling. IPA, CPX, and neutral-dopant ratios (estimated from vibrational absorption spectroscopy) together with electron affinity and ionization energy values (deduced from cyclic voltammetry) allow calculating the width of a Gaussian density of states (DOS) relating to the highest occupied molecular orbital in P3HT. While a broader DOS indicates energetic disorder, we use grazing-incidence x-ray diffraction to assess spatial order. Our findings consider the proposal of nucleation driving IPA formation and we hypothesize a certain host-dopant stoichiometry to be key for the formation of a crystalline CPX phase.
{"title":"Critical dopant concentrations govern integer and fractional charge-transfer phases in doped P3HT","authors":"Hannes Hase, Melissa Berteau-Rainville, Somaiyeh Charoughchi, W. Bodlos, E. Orgiu, I. Salzmann","doi":"10.1088/2515-7639/aca71e","DOIUrl":"https://doi.org/10.1088/2515-7639/aca71e","url":null,"abstract":"The conjugated polymer poly(3-hexylthiophene) (P3HT) p-doped with the strong acceptor tetrafluorotetracyanoquinodimethane (F4TCNQ) is known to undergo ion-pair (IPA) formation, i.e. integer-charge transfer, and, as only recently reported, can form ground state charge-transfer complexes (CPXs) as a competing process, yielding fractional charge transfer. As these fundamental charge-transfer phenomena differently affect doping efficiency and, thus, organic-semiconductor device performance, possible factors governing their occurrence have been under investigation ever since. Here, we focus on the role of a critical dopant concentration deciding over IPA- or CPX-dominated regimes. Employing a broad, multi-technique approach, we compare the doping of P3HT by F4TCNQ and its weaker derivatives F2TCNQ, FTCNQ, and TCNQ, combining experiments with semi-classical modeling. IPA, CPX, and neutral-dopant ratios (estimated from vibrational absorption spectroscopy) together with electron affinity and ionization energy values (deduced from cyclic voltammetry) allow calculating the width of a Gaussian density of states (DOS) relating to the highest occupied molecular orbital in P3HT. While a broader DOS indicates energetic disorder, we use grazing-incidence x-ray diffraction to assess spatial order. Our findings consider the proposal of nucleation driving IPA formation and we hypothesize a certain host-dopant stoichiometry to be key for the formation of a crystalline CPX phase.","PeriodicalId":16520,"journal":{"name":"Journal of Nonlinear Optical Physics & Materials","volume":"23 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2022-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82062530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-11-29DOI: 10.1088/2515-7639/aca71d
M. Meinero, F. Caglieris, A. Leveratto, L. Repetto, M. Fujioka, Y. Takano, U. Zeitler, I. Pallecchi, M. Putti
The complex magnetic ordering of parent compounds of most unconventional superconductors is crucial for the understanding of high-temperature superconductivity (SC). Within this framework, we have performed temperature-dependent magnetotransport experiments on a single crystal of SmFeAsO, a parent compound of iron pnictide superconductors. We observe multiple features in the measured transport properties at temperatures below the antiferromagnetic (AFM) ordering of Sm, T
大多数非常规超导体母体化合物的复杂磁有序对于理解高温超导性(SC)至关重要。在这个框架内，我们在SmFeAsO单晶上进行了温度相关的磁输运实验，SmFeAsO是铁镍超导体的母体化合物。我们观察到在低于反铁磁(AFM) Sm (T
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