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1دورية أكاديمية
المؤلفون: Pecunia, Vincenzo, Silva, S Ravi P, Phillips, Jamie D, Artegiani, Elisa, Romeo, Alessandro, Shim, Hongjae, Park, Jongsung, Kim, Jin Hyeok, Yun, Jae Sung, Welch, Gregory C, Larson, Bryon W, Creran, Myles, Laventure, Audrey, Sasitharan, Kezia, Flores-Diaz, Natalie, Freitag, Marina, Xu, Jie, Brown, Thomas M, Li, Benxuan, Wang, Yiwen, Li, Zhe, Hou, Bo, Hamadani, Behrang H, Defay, Emmanuel, Kovacova, Veronika, Glinsek, Sebastjan, Kar-Narayan, Sohini, Bai, Yang, Bin Kim, Da, Cho, Yong Soo, Žukauskaitė, Agnė, Barth, Stephan, Fan, Feng Ru, Wu, Wenzhuo, Costa, Pedro, del Campo, Javier, Lanceros-Mendez, Senentxu, Khanbareh, Hamideh, Wang, Zhong Lin, Pu, Xiong, Pan, Caofeng, Zhang, Renyun, Xu, Jing, Zhao, Xun, Zhou, Yihao, Chen, Guorui, Tat, Trinny, Ock, Il Woo, Chen, Jun, Graham, Sontyana Adonijah, Yu, Jae Su, Huang, Ling-Zhi, Li, Dan-Dan, Ma, Ming-Guo, Luo, Jikui, Jiang, Feng, Lee, Pooi See, Dudem, Bhaskar, Vivekananthan, Venkateswaran, Kanatzidis, Mercouri G, Xie, Hongyao, Shi, Xiao-Lei, Chen, Zhi-Gang, Riss, Alexander, Parzer, Michael, Garmroudi, Fabian, Bauer, Ernst, Zavanelli, Duncan, Brod, Madison K, Al Malki, Muath, Snyder, G Jeffrey, Kovnir, Kirill, Kauzlarich, Susan M, Uher, Ctirad, Lan, Jinle, Lin, Yuan-Hua, Fonseca, Luis, Morata, Alex, Martin-Gonzalez, Marisol, Pennelli, Giovanni, Berthebaud, David, Mori, Takao, Quinn, Robert J, Bos, Jan-Willem G, Candolfi, Christophe, Gougeon, Patrick, Gall, Philippe, Lenoir, Bertrand, Venkateshvaran, Deepak, Kaestner, Bernd, Zhao, Yunshan, Zhang, Gang, Nonoguchi, Yoshiyuki, Schroeder, Bob C, Bilotti, Emiliano, Menon, Akanksha K, Urban, Jeffrey J, Fenwick, Oliver, Asker, Ceyla, Talin, A Alec
المصدر: Journal of Physics Materials. 6(4)
مصطلحات موضوعية: Engineering, Materials Engineering, Affordable and Clean Energy, energy harvesting materials, photovoltaics, thermoelectric energy harvesting, piezoelectric energy harvesting, triboelectric energy harvesting, radiofrequency energy harvesting, sustainability, Macromolecular and materials chemistry, Physical chemistry, Materials engineering
الوصف: Ambient energy harvesting has great potential to contribute to sustainable development and address growing environmental challenges. Converting waste energy from energy-intensive processes and systems (e.g. combustion engines and furnaces) is crucial to reducing their environmental impact and achieving net-zero emissions. Compact energy harvesters will also be key to powering the exponentially growing smart devices ecosystem that is part of the Internet of Things, thus enabling futuristic applications that can improve our quality of life (e.g. smart homes, smart cities, smart manufacturing, and smart healthcare). To achieve these goals, innovative materials are needed to efficiently convert ambient energy into electricity through various physical mechanisms, such as the photovoltaic effect, thermoelectricity, piezoelectricity, triboelectricity, and radiofrequency wireless power transfer. By bringing together the perspectives of experts in various types of energy harvesting materials, this Roadmap provides extensive insights into recent advances and present challenges in the field. Additionally, the Roadmap analyses the key performance metrics of these technologies in relation to their ultimate energy conversion limits. Building on these insights, the Roadmap outlines promising directions for future research to fully harness the potential of energy harvesting materials for green energy anytime, anywhere.
وصف الملف: application/pdf
URL الوصول: https://escholarship.org/uc/item/9bk579nb
https://escholarship.org/content/qt9bk579nb/qt9bk579nb.pdf -
2تقرير
مصطلحات موضوعية: Condensed Matter - Mesoscale and Nanoscale Physics
الوصف: Over the last two decades organic spintronics has developed into a striving field with exciting reports of long spin diffusion lengths and spin relaxation times in organic semiconductors (OSCs). Easily processed and inexpensive, OSCs are considered a potential alternative to inorganic materials for use in spintronic applications. Spin currents have been detected in a wide range of materials, however, there is still uncertainty over the origin of the signals. Recently, we explored spin transport through an organic semiconductor with lateral spin injection and detection architectures, where the injected spin current is detected non-locally via spin-to-charge conversion in an inorganic detector. In this work we show that the widely-used control experiments like linear power dependence and inversion of the signal with the magnetic field are not sufficient evidence of spin transport and can lead to an incorrect interpretation of the signal. Here, we use in-plane angular dependent measurements to separate pure spin signal from parasitic effects arising from spin rectification (SREs). Apart from well established anisotropic magnetoresistance (AMR) and anomalous Hall effect (AHE), we observed a novel effect which we call spurious inverse spin Hall effect (ISHE). It strongly resembles ISHE behaviour, but arises in the ferromagnet rather than the detector meaning this additional effect has to be considered in future work.
URL الوصول: http://arxiv.org/abs/2108.12413
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3تقرير
المؤلفون: Wittmann, Angela, Schweicher, Guillaume, Broch, Katharina, Novak, Jiri, Lami, Vincent, Cornil, David, McNellis, Erik R., Zadvorna, Olia, Venkateshvaran, Deepak, Takimiya, Kazuo, Geerts, Yves H., Cornil, Jerome, Vaynzof, Yana, Sinova, Jairo, Watanabe, Shun, Sirringhaus, Henning
المصدر: Physical Review Letters 124 (2), 027204 (2020)
مصطلحات موضوعية: Physics - Applied Physics
الوصف: There is a growing interest in utilizing the distinctive material properties of organic semiconductors for spintronic applications. Here, we explore injection of pure spin current from Permalloy into a small molecule system based on dinaphtho[2,3-b:2,3-f]thieno[3,2-b]thiophene (DNTT) at ferromagnetic resonance. The unique tunability of organic materials by molecular design allows us to study the impact of interfacial properties on the spin injection efficiency systematically. We show that both, spin injection efficiency at the interface as well as the spin diffusion length can be tuned sensitively by the interfacial molecular structure and side chain substitution of the molecule.
URL الوصول: http://arxiv.org/abs/2007.16068
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4
المؤلفون: Simatos, Dimitrios, Jacobs, Ian E., Dobryden, Illia, Nguyen, Małgorzata, Savva, Achilleas, Venkateshvaran, Deepak, Nikolka, Mark, Charmet, Jérôme, Spalek, Leszek J., Gicevičius, Mindaugas, Zhang, Youcheng, Schweicher, Guillaume, Howe, Duncan J., Ursel, Sarah, Armitage, John, Dimov, Ivan B., Kraft, Ulrike, Zhang, Weimin, Alsufyani, Maryam, McCulloch, Iain, Owens, Róisín M., Claesson, Per M., Knowles, Tuomas P.J., Sirringhaus, Henning
المصدر: Small Methods. 7(11)
مصطلحات موضوعية: contaminants, glovebox systems, organic electronics, pipettes, silicones, syringes, water uptake
الوصف: Organic semiconductors are a family of pi-conjugated compounds used in many applications, such as displays, bioelectronics, and thermoelectrics. However, their susceptibility to processing-induced contamination is not well understood. Here, it is shown that many organic electronic devices reported so far may have been unintentionally contaminated, thus affecting their performance, water uptake, and thin film properties. Nuclear magnetic resonance spectroscopy is used to detect and quantify contaminants originating from the glovebox atmosphere and common laboratory consumables used during device fabrication. Importantly, this in-depth understanding of the sources of contamination allows the establishment of clean fabrication protocols, and the fabrication of organic field effect transistors (OFETs) with improved performance and stability. This study highlights the role of unintentional contaminants in organic electronic devices, and demonstrates that certain stringent processing conditions need to be met to avoid scientific misinterpretation, ensure device reproducibility, and facilitate performance stability. The experimental procedures and conditions used herein are typical of those used by many groups in the field of solution-processed organic semiconductors. Therefore, the insights gained into the effects of contamination are likely to be broadly applicable to studies, not just of OFETs, but also of other devices based on these materials.
وصف الملف: print
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5تقرير
المؤلفون: Schweicher, Guillaume, D'Avino, Gabriele, Ruggiero, Michael T., Harkin, David J., Broch, Katharina, Venkateshvaran, Deepak, Liu, Guoming, Richard, Audrey, Ruzie, Christian, Armstrong, Jeff, Kennedy, Alan R., Shankland, Kenneth, Takimiya, Kazuo, Geerts, Yves H., Zeitler, J. Axel, Fratini, Simone, Sirringhaus, Henning
مصطلحات موضوعية: Condensed Matter - Materials Science
الوصف: Molecular vibrations play a critical role in the charge transport properties of weakly van der Waals bonded organic semiconductors. To understand which specific phonon modes contribute most strongly to the electron-phonon coupling and ensuing thermal energetic disorder in some of the most widely studied high mobility molecular semiconductors, state-of-the-art quantum mechanical simulations of the vibrational modes and the ensuing electron phonon coupling constants are combined with experimental measurements of the low-frequency vibrations using inelastic neutron scattering and terahertz time-domain spectroscopy. In this way, the long-axis sliding motion is identified as a killer phonon mode, which in some molecules contributes more than 80% to the total thermal disorder. Based on this insight, a way to rationalize mobility trends between different materials and derive important molecular design guidelines for new high mobility molecular semiconductors is suggested.
Comment: 10 pages, 5 figuresURL الوصول: http://arxiv.org/abs/1903.10852
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6دورية أكاديمية
المؤلفون: Dobryden, IlliaAff1, Aff2, Korolkov, Vladimir V.Aff3, IDs4146702230801x_cor2, Lemaur, Vincent, Waldrip, Matthew, Un, Hio-Ieng, Simatos, Dimitrios, Spalek, Leszek J., Jurchescu, Oana D., Olivier, Yoann, Claesson, Per M., Venkateshvaran, DeepakAff6, IDs4146702230801x_cor11
المصدر: Nature Communications. 13(1)
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7دورية أكاديمية
المؤلفون: Nikolka, Mark, Broch, Katharina, Armitage, John, Hanifi, David, Nowack, Peer J, Venkateshvaran, Deepak, Sadhanala, Aditya, Saska, Jan, Mascal, Mark, Jung, Seok-Heon, Lee, Jin‐Kyun, McCulloch, Iain, Salleo, Alberto, Sirringhaus, Henning
المصدر: Nature Communications. 10(1)
مصطلحات موضوعية: Engineering, Macromolecular and Materials Chemistry, Materials Engineering, Chemical Sciences
الوصف: Charge transport in conjugated polymer semiconductors has traditionally been thought to be limited to a low-mobility regime by pronounced energetic disorder. Much progress has recently been made in advancing carrier mobilities in field-effect transistors through developing low-disorder conjugated polymers. However, in diodes these polymers have to date not shown much improved mobilities, presumably reflecting the fact that in diodes lower carrier concentrations are available to fill up residual tail states in the density of states. Here, we show that the bulk charge transport in low-disorder polymers is limited by water-induced trap states and that their concentration can be dramatically reduced through incorporating small molecular additives into the polymer film. Upon incorporation of the additives we achieve space-charge limited current characteristics that resemble molecular single crystals such as rubrene with high, trap-free SCLC mobilities up to 0.2 cm2/Vs and a width of the residual tail state distribution comparable to kBT.
وصف الملف: application/pdf
URL الوصول: https://escholarship.org/uc/item/5925h9gq
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المؤلفون: Panchal, Vishal, Dobryden, Illia, Hangen, Ude D., Simatos, Dimitrios, Spalek, Leszek J., Jacobs, Ian E., Schweicher, Guillaume, Claesson, Per M., Venkateshvaran, Deepak
المصدر: Advanced Electronic Materials. 8(3)
مصطلحات موضوعية: Experimentell fysik, Experimental Physics
الوصف: Organic semiconducting polymers have attractive electronic, optical, and mechanical properties that make them materials of choice for large area flexible electronic devices. In these devices, the electronically active polymer components are micrometers in size, and sport negligible performance degradation upon bending the centimeter-scale flexible substrate onto which they are integrated. A closer look at the mechanical properties of the polymers, on the grain-scale and smaller, is not necessary in large area electronic applications. In emerging micromechanical and electromechanical applications where the organic polymer elements are flexed on length scales spanning their own micron-sized active areas, it becomes important to characterize the uniformity of their mechanical properties on the nanoscale. In this work, the authors use two precision nanomechanical characterization techniques, namely, atomic force microscope based PeakForce quantitative nanomechanical mapping (PF-QNM) and nanoindentation-based dynamical mechanical analysis (nano-DMA), to compare the modulus and the viscoelastic properties of organic polymers used routinely in organic electronics. They quantitatively demonstrate that the semiconducting near-amorphous organic polymer indacenodithiophene-co-benzothiadiazole (C16-IDTBT) has a higher carrier mobility, lower modulus, and greater nanoscale modulus areal uniformity compared to the semiconducting semicrystalline organic polymer poly[2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene] (C14-PBTTT). Modulus homogeneity appears intrinsic to C16-IDTBT but can be improved in C14-PBTTT upon chemical doping.
وصف الملف: print
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9دورية أكاديمية
المؤلفون: Ulrich Georg, Pfitzner Emanuel, Hoehl Arne, Liao Jung-Wei, Zadvorna Olga, Schweicher Guillaume, Sirringhaus Henning, Heberle Joachim, Kästner Bernd, Wunderlich Jörg, Venkateshvaran Deepak
المصدر: Nanophotonics, Vol 9, Iss 14, Pp 4347-4354 (2020)
مصطلحات موضوعية: nanospectroscopy, photothermoelectric effect, s-snom, Physics, QC1-999
الوصف: We present a nanospectroscopic device platform allowing simple and spatially resolved thermoelectric detection of molecular fingerprints of soft materials. Our technique makes use of a locally generated thermal gradient converted into a thermoelectric photocurrent that is read out in the underlying device. The thermal gradient is generated by an illuminated atomic force microscope tip that localizes power absorption onto the sample surface. The detection principle is illustrated using a concept device that contains a nanostructured strip of polymethyl methacrylate (PMMA) defined by electron beam lithography. The platform’s capabilities are demonstrated through a comparison between the spectrum obtained by on-chip thermoelectric nanospectroscopy with a nano-FTIR spectrum recorded by scattering-type scanning near-field optical microscopy at the same position. The subwavelength spatial resolution is demonstrated by a spectral line scan across the edge of the PMMA layer.
وصف الملف: electronic resource
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10تقرير
المؤلفون: Di Pietro, Riccardo, Venkateshvaran, Deepak, Klug, Andreas, List-Kratochvil, Emil J. W., Facchetti, Antonio, Sirringhaus, Henning, Neher, Dieter
مصطلحات موضوعية: Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
الوصف: A model for the extraction of the charge density dependent mobility and variable contact resistance in thin film transistors is proposed by performing a full derivation of the current-voltage characteristics both in the linear and saturation regime of operation. The calculated values are validated against the ones obtained from direct experimental methods. This approach allows unambiguous determination of both contact and channel resistance from the analysis of the current voltage characteristics of a single device, with no a-priori assumption on the two parameters. It solves the inconsistencies in the commonly accepted mobility extraction methods and provides new possibilities for the analysis of the injection and transport processes in semiconducting materials.
Comment: Submitted to Applied Physics LettersURL الوصول: http://arxiv.org/abs/1402.5241
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