Article
Nanoscience & Nanotechnology
Hansol Lee, Byungho Moon, Min-Jae Kim, Hee Su Kim, Do-Hoon Hwang, Boseok Kang, Kilwon Cho
Summary: The effect of fluorination of a conjugated polymer backbone on charge trapping and the operational stability of organic field-effect transistors is investigated. It is found that although fluorination can increase charge carrier mobility, it leads to poor operational stability due to the presence of a greater degree of shallow trapping and the presence of minority charge carriers.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Heqing Ye, Ka Yeon Ryu, Hyeok-jin Kwon, Hyunji Lee, Rixuan Wang, Jisu Hong, Hyun Ho Choi, Sang Yong Nam, Jihoon Lee, Hoyoul Kong, Se Hyun Kim
Summary: New polymeric insulating materials called MBHCa-F, composed of acrylate and fluorinated functional groups, were synthesized and used as gate insulators for organic thin-film transistors (OTFTs). These materials significantly reduce traps at the interface between the organic semiconductor and gate insulator, enhancing the operation stability and electrical performance of OTFTs.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Lukasz Janasz, Michal Borkowski, Paul W. M. Blom, Tomasz Marszalek, Wojciech Pisula
Summary: Organic semiconductors face limitations in their practical applicability due to low environmental stability and poor charge carrier mobilities. Blending with thermoplastic polymers and elastomers can overcome these restrictions and induce new material properties, showcasing great potential for flexible and stretchable electronics. Improved device properties such as charge carrier mobility, life-time, sensing ability, and mechanical behavior are achieved through blending with insulators, offering promise for various electronic devices and semiconductor classes.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Marco Hoeppner, Bahman Kheradmand-Boroujeni, Joern Vahland, Michael Franz Sawatzki, David Kneppe, Frank Ellinger, Hans Kleemann
Summary: The high-frequency and low-voltage operation of organic thin-film transistors (OTFTs) is crucial for the commercial success of flexible electronics. While significant progress has been made, technology maturity remains a key challenge, including scalability, integrability, and device reliability.
Article
Chemistry, Multidisciplinary
Arulmozhi Velusamy, Chih-Hsin Yu, Shakil N. Afraj, Chia-Chi Lin, Wei-Yu Lo, Chia-Jung Yeh, Ya-Wen Wu, Hsin-Chun Hsieh, Jianhua Chen, Gene-Hsiang Lee, Shih-Huang Tung, Cheng-Liang Liu, Ming-Chou Chen, Antonio Facchetti
Summary: A novel family of quinoidal thienoisoindigo (TII)-containing small molecules with dicyanomethylene end-capping units and different alkyl chains were synthesized for n-type organic small molecules in solution-processable organic field effect transistors (OFETs). The detailed molecular structure, properties, and performance of the 2-hexyldecyl substituted derivative, TIIQ-b16, were systematically studied, revealing its potential as electron transporting semiconductors with enhanced ambient stability. The results suggest that constructing quinoidal molecules from TII moiety is an effective approach to improve n-type charge transport characteristics.
Article
Green & Sustainable Science & Technology
Rosarita D'Orsi, Cristian Vlad Irimia, Jeannette J. Lucejko, Bilge Kahraman, Yasin Kanbur, Cigdem Yumusak, Mateusz Bednorz, Francesco Babudri, Mihai Irimia-Vladu, Alessandra Operamolla
Summary: Lignin is an abundant biopolymer derived from industrial pulping processes, but its application as a fine material is limited due to the lack of knowledge about its molecular structure and properties. This study analyzes the structural and chemical-physical characteristics of two kraft lignins and demonstrates their efficient application as gate dielectric materials in organic field-effect transistors.
ADVANCED SUSTAINABLE SYSTEMS
(2022)
Article
Chemistry, Multidisciplinary
Zheng Chen, Shuming Duan, Xiaotao Zhang, Wenping Hu
Summary: A dual-function surfactant strategy was used to control the growth of large-area 2D organic semiconductor crystals, resulting in high-quality crystals and improved OFET mobility. This method opens up new possibilities for achieving high-performance OFETs with various high-quality 2D organic semiconductor crystals.
SCIENCE CHINA-CHEMISTRY
(2021)
Article
Nanoscience & Nanotechnology
Hansol Lee, Byungho Moon, Sung Yun Son, Taiho Park, Boseok Kang, Kilwon Cho
Summary: The study found that low-crystalline conjugated polymers can provide high charge carrier mobility, but their high degree of structural disorder leads to poor intrinsic operational stability, making them unsuitable for practical OFETs.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Kenji Sakamoto, Kirill Bulgarevich, Takeshi Yasuda, Takeo Minari, Masayuki Takeuchi
Summary: The origin of intrinsic operational instability in organic field-effect transistors (OFETs) is discussed by comparing bias stress effects of OFETs with unidirectionally aligned and unaligned active layers of two different semiconducting polymers under vacuum environment. The results indicate that an increase in mobility does not necessarily lead to an increase in operational stability.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Remy Jouclas, Jie Liu, Martina Volpi, Lygia Silva de Moraes, Guillaume Garbay, Nemo McIntosh, Marco Bardini, Vincent Lemaur, Alexandre Vercouter, Christos Gatsios, Federico Modesti, Nicholas Turetta, David Beljonne, Jerome Cornil, Alan R. Kennedy, Norbert Koch, Peter Erk, Paolo Samori, Guillaume Schweicher, Yves H. Geerts
Summary: The charge transport of crystalline organic semiconductors is limited by dynamic disorder that tends to localize charges. This study proposes an innovative design that combines a chemical structure based on sulfur-rich thienoacene with a solid-state herringbone (HB) packing to overcome this limitation. Two new thienoacenes are synthesized and characterized, and their charge transport properties are investigated. The results show promising device performances and pave the way for the design of high-performing materials based on this new thienoacene.
Article
Polymer Science
Wei-Yao Tung, Cheng Pu, Yi-Fan Huang, Wei Xie, Chung-Fu Cheng, Yun-Yu Lai, Xiang Li, Heng-Yi Lin, Yueh-Ting Lai, Kun Chen, Chien-Lung Wang, Yu Zhu
Summary: This study synthesized a series of donor-acceptor conjugated polymers containing soluble benzimidazolone-dioxazine structures and investigated their performance in organic field effect transistor devices. The results showed that increasing the number of thiophene rings led to higher molecular weight polymers and improved device performance.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Taehoon Hwang, Eunyoung Park, Jungyoon Seo, Dashdendev Tsogbayar, Eun Ko, Chanwoo Yang, Hyungju Ahn, Dong Yun Lee, Hwa Sung Lee
Summary: This study investigates the correlation between organic field-effect transistors (OFETs) and organic charge-modulated field-effect transistors (OCMFETs) to improve the understanding of driving mechanisms in OCMFETs and optimize their device performance. By introducing self-assembled monolayers with different functional groups on the gate dielectric surface, the impact of surface characteristics on the electrical behavior of both devices is explored. The dipole moment of the dielectric surface is identified as a critical control variable in the performance correlation between OFET and OCMFET devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Qing Zhang, Tengyu Jin, Xin Ye, Dechao Geng, Wei Chen, Wenping Hu
Summary: Photonic artificial synapses-based neuromorphic computing systems are promising candidates for replacing von Neumann-based systems. Organic field-effect transistors (OFETs) have significant advantages in synaptic emulation, enabling complex photoelectric modulation and simulation of the visual system.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Wanlong Lu, Jingning Cao, Chenyang Zhai, Laju Bu, Guanghao Lu, Yuanwei Zhu
Summary: This study investigated the influence of a novel soluble molecular dopant, CN6-CP, on the performance optimization of OFETs. The results showed that doping with CN6-CP significantly improved the field-effect mobility of OFETs and enabled wide tunability of the threshold voltage, demonstrating great potential for organic electronic applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Eun-Sol Shin, Ji-Young Go, Gi-Seong Ryu, Ao Liu, Yong-Young Noh
Summary: The stability of OSC-based gas sensors can be greatly improved by adding molecular additives, allowing for reliable and reversible gas detection in air for multiple uses.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Dennis Derewjanko, Dorothea Scheunemann, Emmy Jaersvall, Anna Hofmann, Christian Mueller, Martijn Kemerink
Summary: This study reveals a power-law relationship between conductivity and charge density in strongly p-doped conjugated polymers at high doping levels. Conventional models fail to explain this behavior, but a variable range hopping model with an energy-dependent localization length can. The superlinear increase in conductivity with charge density is observed when the Fermi level reaches partially delocalized states.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Tanvi Upreti, Constantin Tormann, Martijn Kemerink
Summary: A loss channel in organic photovoltaic cells, caused by the thermalization of charge carriers in the density of states due to energetic disorder, has been demonstrated to be mitigated through carefully designed morphologies. The presence of funnel-shaped domains promotes directed transport of charge carriers, leading to improved performance.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Pietro Luigi Muzzeddu, Hidde Derk Vuijk, Hartmut Loewen, Jens-Uwe Sommer, Abhinav Sharma
Summary: This study investigates the effect of activity gradients on active colloidal molecules. The authors found that as the torque increases, the behavior of active chiral dimers switches from antichemotactic to chemotactic. The emergence of chemotaxis is due to the cooperative exploration of an activity gradient by the two particles. Furthermore, the study shows that the dynamics and chemotactic behavior of chiral active particles are generally different from charged Brownian particles under a magnetic field.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Erik Kalz, Hidde Derk Vuijk, Iman Abdoli, Jens-Uwe Sommer, Hartmut Loewen, Abhinav Sharma
Summary: It has been discovered that collisions can enhance self-diffusion in odd-diffusive systems, which goes against the common belief. Through analytical predictions and Brownian dynamics simulations, this counterintuitive behavior in the odd-diffusive system has been explained.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Andrey A. Butkevich, Martijn Kemerink
Summary: This study analyzed the effect of dip-coating on the pre-alignment of supramolecular ferroelectric materials and observed that dip-coating can enhance the ferroelectric switching behavior.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Energy & Fuels
Tanvi Upreti, Yuming Wang, Feng Gao, Martijn Kemerink
Summary: Mixing a third compound into the active layer of an organic bulk heterojunction solar cell to form a ternary system is an established method to improve performance. This study uses kinetic Monte Carlo simulations to investigate the role of morphology and relative energy levels of the constituent materials. The results provide insights for selecting third compounds that promote improved performance.
Article
Physics, Applied
Aditya Dash, Dorothea Scheunemann, Martijn Kemerink
Summary: This study presents a unified model to explain charge and energy transport in networks of semiconducting single-walled carbon nanotubes. By using the steady-state master equation and the Boltzmann-transport formalism, the electrical and thermoelectric properties of the network, including conductivity, Seebeck coefficient, and electronic contribution to thermal conductivity, can be obtained. The model provides a consistent description of previously published experimental data and offers insights for improving the thermoelectric efficiency of the networks.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Physical
I. Abdoli, H. Loewen, J. -U. Sommer, A. Sharma
Summary: Kramers's theory accurately describes the probability of a thermally activated Brownian particle escaping a potential well, with escape time exponentially decreasing as the barrier height increases. In the presence of a charged particle under a Lorentz force due to an external magnetic field, the dynamics slow down. Our study demonstrates that the barrier height can be effectively modified when a charged particle is exposed to a vortex flow. When combined with a magnetic field, the vortex either pushes the particle radially outside or inside, influencing the particle's escape behavior.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Review
Nanoscience & Nanotechnology
Dorothea Scheunemann, Clemens Goehler, Constantin Tormann, Koen Vandewal, Martijn Kemerink
Summary: With power conversion efficiencies approaching 20%, organic solar cells have gained recognition in the field of photovoltaics. However, there is still a need for further improvement in energy and current management. The interpretation schemes for associated losses of energy and charge vary, hindering the design of next-generation organic solar cells. This article reviews important concepts, addresses open questions, and highlights implications for device performance and improvement.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Indre Urbanaviciute, Miguel Garcia-Iglesias, Andrey Gorbunov, E. W. Meijer, Martijn Kemerink
Summary: In this study, the authors replaced amides with thioamides in the discotic molecule BTA and found that the thioamide-based materials exhibited higher remnant polarization and lower coercive field. They also observed a rare negative piezoelectricity and the experimentally unobserved polarization reversal through asymmetric intermediate states, known as ferrielectric switching.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Sadjad Arzash, Abhinav Sharma, Fred C. MacKintosh
Summary: Biopolymer networks are common in biological systems and their mechanics can be explained by a phase transition from soft to rigid states. This study investigates the mechanics of such networks under applied bulk or isotropic extension, and finds similar critical behavior in the bulk modulus.
Article
Physics, Fluids & Plasmas
Hidde D. Vuijk, Sophie Klempahn, Holger Merlitz, Jens-Uwe Sommer, Abhinav Sharma
Summary: The study focuses on the behavior of an active colloidal dimer consisting of two active Brownian particles in an activity gradient, showing chemotactic and antichemotactic behavior depending on the relative orientation of the two particles. The research has implications for designing autonomous active colloidal structures that adjust their motion based on local activity gradients.
Review
Chemistry, Physical
Dorothea Scheunemann, Emmy Jaersvall, Jian Liu, Davide Beretta, Simone Fabiano, Mario Caironi, Martijn Kemerink, Christian Mueller
Summary: Research on conjugated polymers for thermoelectric applications has made significant progress, particularly in the area of molecular doping for enhanced electrical conductivity. This review summarizes recent developments and strategies in molecular doping of p- and n-type conjugated polymers to improve their electrical conductivity. The impact of the chemical design, processing conditions, and resulting nanostructure on doping efficiency and stability is discussed, along with the interdependence of electrical and thermal transport characteristics.
CHEMICAL PHYSICS REVIEWS
(2022)
Article
Materials Science, Multidisciplinary
M. Taherpour, C. van Hoesel, R. Coehoorn, P. A. Bobbert
Summary: The study investigates triplet-triplet annihilation (TTA) in modern organic light-emitting diodes and proposes a master equation modeling approach to efficiently account for correlations. It was found that TTA affects the results of transient photoluminescence experiments and steady-state emission efficiency. A comparison with kinetic Monte Carlo simulations indicates that the master equation modeling is an accurate and computationally competitive alternative.
Article
Chemistry, Physical
Iman Abdoli, Abhinav Sharma
Summary: Equilibrium properties of passively diffusing particles in an external magnetic field are not affected by Lorentz force, while active Brownian particles exhibit steady-state phenomena that depend on the applied magnetic field's strength and polarity. Through stochastic resetting, an active system transitions into a stationary state characterized by non-uniform density distribution and bulk fluxes perpendicular to density gradients, with novel features emerging in the presence of an inhomogeneous magnetic field. Theoretical predictions are validated using Brownian dynamics simulations, showing that active particles exhibit non-monotonic density distribution at lower resetting rates and take longer to reach a target point when the magnetic field increases away from the axis.