Article
Materials Science, Multidisciplinary
Jiufu Zhu, Bo Yu, Dacheng Bai, Dongye Pan, Jiawei Zou, Xiaoyu Shi, Shuxiang Ding, Bowen Zhang, Donghang Yan, Xiaojuan Hao, Zuosen Shi, Zhanchen Cui
Summary: In this study, a series of aryl group functionalized polymers were prepared via RAFT polymerization for use as insulator materials in pentacene thin-film transistors. The block polymers containing naphthyl side groups induced an ordered morphology of pentacene through pi-pi interactions and increased the dielectric constant, resulting in a lower threshold voltage.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Engineering, Multidisciplinary
Nihat Akkan, Mustafa Altun, Herman Sedef
Summary: This study presents a behavioral compact model and its implementation for low-voltage pentacene-based organic thin film transistors (OTFTs) using the industry standard BSIM4 model and LTspice platform. The model parameters are simplified according to the device structure, and the BSIM4 mobility equation is adapted for OTFTs. Metaheuristics-based optimization is performed to extract the model parameters and fit the modified model to experimental data. The behavioral compact model is implemented in LTspice and validated for low-voltage pentacene-based OTFTs. Additionally, OTFT implementations of a Pseudo-E inverter, a Pseudo-E NAND gate, and a 1-bit full adder circuit are successfully simulated using the behavioral model.
ENGINEERING SCIENCE AND TECHNOLOGY-AN INTERNATIONAL JOURNAL-JESTECH
(2023)
Article
Materials Science, Multidisciplinary
Kaibin Wu, Jisu Hong, Xue Qi, Heqing Ye, Zhijun Li, Chenhao Cong, Jian Liu, Xi Li, Ka Yeon Ryu, Sang Yong Nam, Xinlin Li, Sooman Lim, Se Hyun Kim
Summary: In this study, the screen printing of Ag nanoparticle inks for the electrodes of organic thin-film transistors (OTFTs) was systematically investigated. The printing process conditions and substrate surface modification were controlled to optimize the printing process. The resulting Ag nanoparticle electrodes showed high electrical conductivity, pattern-fidelity, and adhesion to the substrate. OTFTs with different device structures were fabricated using the optimized Ag nanoparticle electrodes, and the best device performance was achieved on Si/SiO2 substrates with a bottom-gate, bottom-contact (BGBC) structure.
ORGANIC ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Huihong Jiang, Boyu Peng, Shuang Liu, Jie Ren, Weitao Yang, Chengce Lin, Ruihan Wu, Hongzheng Chen, Hanying Li
Summary: This study investigates the performance of ribbon-like TIPS-pentacene single crystals in different bending scenarios, revealing that the single crystal will crack or delaminate with increasing tensile or compressive bending strain. Interestingly, devices exhibit negligible decline in mobility even if the crystal surface has obvious cracks, attributed to the intact charge transport channel. Furthermore, devices show superior stability after 1000 consecutive bending cycles or being kept bent for 20 days.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Engineering, Electrical & Electronic
Xincheng Zhang, Meng Zhang, Yan Yan, Ye Zhou, Man Wong, Hoi-Sing Kwok
Summary: This study fabricates and characterizes organic thin-film transistors (OTFTs) with various interface modification conditions. In addition to chemically homogeneous dielectric surfaces to enhance electrical characteristics of devices, morphologically homogeneous surfaces also play a crucial role in achieving device-to-device uniformity of OTFTs.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Zeno Schumacher, Rasa Rejali, Megan Cowie, Andreas Spielhofer, Yoichi Miyahara, Peter Grutter
Summary: Inducing an inversion layer in organic semiconductors is a critical achievement for producing OFET devices, and a new pulsed bias technique is developed to characterize the dopant type of different organic material systems. This technique accurately identifies n-doping in pentacene/PTCDI heterostructure, demonstrating that nanometer-scale lateral extent and thickness are sufficient for an OFET device to operate in the inversion regime.
Article
Engineering, Electrical & Electronic
Chuan Yu Han, P. T. Lai, Wing Man Tang
Summary: High-performance pentacene organic thin-film transistors with Hf-0.13 La0.87O gate dielectric and Pd gate electrode show high carrier mobility on both Si and PI substrates, with good stability after exposure to air for 30 days without encapsulation.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Soosang Chae, Tae Il Lee, Jin Young Oh
Summary: By blending PαMS binder with TIPS-pentacene, the electrical stability of organic thin film transistors (OTFTs) was improved through the formation of a vertically phase-separated semiconducting film. This modification induced interface changes, resulting in increased charge current density, decreased charge trap density, reduced electrical hysteresis, and increased field-effect mobility.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Polymer Science
Yusniza Yunus, Nurul Adlin Mahadzir, Mohamed Nainar Mohamed Ansari, Tg Hasnan Tg Abd Aziz, Atiqah Mohd Afdzaluddin, Hafeez Anwar, Mingqing Wang, Ahmad Ghadafi Ismail
Summary: This review provides an overview of different deposition methods for pentacene and its derivatives, including thermal evaporation and solution-processable methods. It offers recommendations for specific device applications based on film quality and device performance.
Article
Engineering, Electrical & Electronic
Calla M. McCulley, Xin Xu, Kelly Liang, Xiao Wang, Liang Wang, Ananth Dodabalapur
Summary: This design approach significantly improves the electrical performance and mitigates short-channel effects in short-channel organic thin-film transistors, reducing the total source-to-drain resistance to about 50 ohm.cm.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Polymer Science
Jiufu Zhu, Shizhang Li, Dacheng Bai, Dongye Pan, Jiawei Zou, Yan Zheng, Bowen Zhang, Xiaojuan Hao, Wei Wang, Zuosen Shi, Zhanchen Cui
Summary: The growth of pentacene in organic thin-film transistors is effectively modulated by introducing aromatic rings in the gate insulating layer, resulting in improved film morphology and performance.
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2023)
Review
Chemistry, Physical
Chenfang Sun, Xue Wang, Muhammad Aminu Auwalu, Shanshan Cheng, Wenping Hu
Summary: Organic thin film transistors (OTFTs)-based biosensors are capable of transferring biological signals into electrical signals, but developing sensors with excellent sensitivity, selectivity, and stability remains a challenge. Recent research has focused on various types of OTFTs, such as organic field-effect transistors (OFETs), electrolyte-gated OFETs (EGOFETs), and organic electrochemical transistors (OECTs), for high-performance bioelectronics applications.
Article
Polymer Science
Yeqing Sun, Ziyang Zhang, Kyeiwaa Asare-Yeboah, Sheng Bi, Zhengran He
Summary: Phase segregation induced by mixing organic semiconductors with polymeric additives has been effectively utilized in this study to control semiconductor crystal growth and morphology. The inclusion of poly(butylacrylate) resulted in vertical and lateral phase segregation with TIPS pentacene, leading to improved grain width and reduced crystal misorientation. The reported method shows potential for high performance organic electronic device applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Rosemary R. Cranston, Mario C. Vebber, Jonatas Faleiro Berbigier, Nicole A. Rice, Claire Tonnele, Zachary J. Comeau, Nicholas T. Boileau, Jaclyn L. Brusso, Adam J. Shuhendler, Frederic Castet, Luca Muccioli, Timothy L. Kelly, Benoit H. Lessard
Summary: This study investigated eight axially substituted SiPcs and their application in solution-processed n-type OTFTs. It was found that the length of the alkyl chain affects device performance and thin-film morphology, and the effects of high-temperature annealing and spin coating time on film formation were explored. The study also revealed that thermal annealing and spin time significantly impact film crystallinity, morphology, and device performance, with bis(tri-n-butylsilyl oxide) SiPc showing the highest electron field-effect mobility among the studied materials.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
Praveena Rajput, Hitesh Kumar, Vinay Kumar Singh
Summary: In this study, the bottom-gate top-contact configuration of pentacene OTFTs was fabricated using two different dielectric layers. The effect of scaling the thickness of both PMMA and cross-linkable PVP polymer dielectrics on the subthreshold slope (SS) in top-contact pentacene OTFTs was investigated. Subthreshold slope improved significantly with the scaling of dielectric thicknesses.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Review
Chemistry, Multidisciplinary
Wonhee Ko, Zheng Gai, Alexander A. Puretzky, Liangbo Liang, Tom Berlijn, Jordan A. Hachtel, Kai Xiao, Panchapakesan Ganesh, Mina Yoon, An-Ping Li
Summary: This article reviews the recent progress in understanding the role of heterogeneities in quantum materials and their effects on quantum behaviors. The authors assess three interconnected areas, including revealing the degrees of freedom of heterogeneities, understanding their impact on quantum states, and controlling heterogeneities for new quantum functions.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Sumner B. Harris, Yu-Chuan Lin, Alexander A. Puretzky, Liangbo Liang, Ondrej Dyck, Tom Berlijn, Gyula Eres, Christopher M. Rouleau, Kai Xiao, David B. Geohegan
Summary: In this study, a feedback approach was used to investigate the transformation pathways of monolayer WS2 crystals into Janus WSSe and WSe2. Real-time Raman spectroscopy and photoluminescence were employed to assess the structure, composition, and optoelectronic quality of the monolayer crystal during the implantation of selenium. The results provide a method to achieve fractional and complete Janus WSSe monolayers as metastable transition states.
Article
Chemistry, Physical
Sang Kyu Park, Hong Sun, Michael Bernhardt, Kyoungtae Hwang, John E. Anthony, Kejie Zhao, Ying Diao
Summary: Ferroelasticity of organic single crystals is of great interest and has potential applications in high-performance ultraflexible, stretchable single-crystalline (opto-) electronics. This study reveals the structural criteria for ferroelastic transition of TAS-acene crystals, a high-performance organic semiconductor material. It is found that the absence of two-dimensional brickwork packing in both neighboring aromatic core and TAS side-chain interlocking is necessary for achieving ferroelastic transitions. This study provides insight into the material design principle of inherently flexible organic semiconductor crystals.
CHEMISTRY OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Sheng Bi, Xu Han, Qiangqiang Chen, Buhan Gao, Luhua Chen, Zhengran He, Chengming Jiang
Summary: Flexible self-power triboelectric nanogenerators (TENGs) based on porous wood have ultralarge folding curvature and extreme high stability, making them ideal for real-time body motion monitoring. The output power of the porous wood-based TENG is more than 200% higher than that of natural wood, and it has rapid degradation and reliable repeatability and stability.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Physical
Ryan D. Dill, Gajadhar Joshi, Karl J. Thorley, John E. Anthony, Brian Fluegel, Justin C. Johnson, Obadiah G. Reid
Summary: Singlet fission proceeds through a manifold of triplet-pair states that are difficult to distinguish spectroscopically. By introducing photoinduced-absorption-detected magnetic resonance (PADMR), we studied the excited-state absorption spectrum of a TSPS-PDT film. Our results clarify the origin of triplet-associated near-infrared absorption features in singlet-fission materials and demonstrate a useful tool for studying high-spin excited states.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Xu Han, Kyeiwaa Asare-Yeboah, Zhengran He, Chengming Jiang, Sheng Bi
Summary: As high-voltage output and fast response devices, triboelectric nanogenerators (TENGs) are widely used for sensors with fast and high-sensitivity performance. The contact charging principle of TENGs is further discussed based on mosaic charging and residual charge theories. The experimental results show that wavy TENGs have excellent output properties compared to those of TENGs with flat structures, such as longer charging and discharging times and more complex waveforms. Our work provides new prospects for application in various sensors of interactive wearable systems, intelligent robots, and optoelectronic devices based on TENGs.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Daniel T. W. Toolan, Michael P. Weir, Rachel C. Kilbride, John E. Anthony, Neil C. Greenham, Richard H. Friend, Akshay Rao, Oleksandr O. Mykhaylyk, Richard A. L. Jones, Anthony J. Ryan
Summary: Controlling the dispersion of inorganic quantum dots (QDs) in organic semiconductor (OSC) nanocomposite films is crucial for optoelectronic devices. In this study, small changes to the OSC host molecule were found to significantly affect QD dispersibility within the host matrix. While it is common to modify QD surface chemistry to improve dispersibility, blending two different OSCs was shown to be an alternative route for optimizing QD dispersibility, resulting in a fully mixed OSC matrix phase.
Article
Chemistry, Physical
Matthew Waldrip, Yue Yu, Rudolph Holley III, Yueh-Lin Loo, John E. Anthony, Oana D. Jurchescu
Summary: Organic semiconductors (OSCs) have potential for optoelectronic applications, but are sensitive to impurities. Researchers used simulations and experiments to identify organic field-effect transistor (OFET) geometries that tolerate impurities without impacting performance, enabling the development of high-performance organic devices at a lower cost.
CHEMISTRY OF MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Yuan Qin, Ming Xiao, Ruizhe Zhang, Qingyun Xie, Tomas Palacios, Boyan Wang, Yunwei Ma, Ivan Kravchenko, Dayrl P. Briggs, Dale K. Hensley, Bernadeta R. Srijanto, Yuhao Zhang
Summary: This work presents the fabrication of quasi-vertical GaN Schottky barrier diodes (SBDs) on a 6-inch Si substrate with a record-breaking breakdown voltage (BV) of over 1 kV. The novel use of a deep mesa in quasi-vertical devices allows for a self-aligned edge termination, and the mesa sidewall is covered by p-type nickel oxide (NiO) to reduce the surface field. The device exhibits a parallel-plane junction electric field of 2.8 MV/cm, along with low turn-on voltage and specific on-resistance. Additionally, it demonstrates excellent overvoltage robustness under continuous stress.
IEEE ELECTRON DEVICE LETTERS
(2023)
Editorial Material
Chemistry, Physical
David B. Geohegan, Alexander A. Puretzky, Kai Xiao
Summary: An alloy engineering approach has been developed to grow atomically thin bilayers with predictable and tunable moire patterns reliably.
Article
Chemistry, Physical
Xu Han, Kyeiwaa Asare-Yeboah, Zhengran He, Chengming Jiang, Sheng Bi
Summary: Triboelectric nanogenerators (TENGs) are widely used as high-voltage output and fast response devices in sensors with fast and high-sensitivity performance. The contact charging principle of TENGs is further discussed based on mosaic charging and residual charge theories. By researching the waveform in depth, our work will provide new prospects for application in various sensors of interactive wearable systems, intelligent robots, and optoelectronic devices based on TENGs.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Review
Materials Science, Multidisciplinary
Zhengran He, Ziyang Zhang, Kyeiwaa Asare-Yeboah, Sheng Bi
Summary: Solution processed, flexible electronics has gained significant research attention in recent years for its promising applications in semiconductor device fabrication. Binary solvents play a crucial role in determining the crystallization and electrical performance of organic semiconductors. This article provides a comprehensive review on the effect of engineering binary solvents on the crystallization process and highlights the potential of solvent optimization for improving charge transport in flexible electronic devices.
MATERIALS ADVANCES
(2023)
Article
Multidisciplinary Sciences
Marti Checa, Addis S. Fuhr, Changhyo Sun, Rama Vasudevan, Maxim Ziatdinov, Ilia Ivanov, Seok Joon Yun, Kai Xiao, Alp Sehirlioglu, Yunseok Kim, Pankaj Sharma, Kyle P. Kelley, Neus Domingo, Stephen Jesse, Liam Collins
Summary: Unraveling local dynamic charge processes is essential for progress in various fields. Researchers have developed high-speed sparse scanning Kelvin probe force microscopy, enabling sub-second imaging of nanoscale charge dynamics and enhancing understanding of material heterogeneities.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Liang-Chun Lin, Tanner Smith, Qianxiang Ai, Brandon K. Rugg, Chad Risko, John E. Anthony, Niels H. Damrauer, Justin C. Johnson
Summary: In this study, a pyrene-bridged parallel tetracene dimer (TPT) with optimized interchromophore coupling strength was synthesized. The long-lived and strongly spin-polarized multiexciton quintet state, (TT)-T-5, was observed through transient absorption and electron paramagnetic resonance spectroscopy. The lifetime of (TT)-T-5 was estimated to be >35 μs, with a dephasing time (T-2) of 726 ns at 10 K for the corresponding qubit. The experimental results support recent theoretical models.
Article
Multidisciplinary Sciences
Zening Liu, Jong K. Keum, Tianyu Li, Jihua Chen, Kunlun Hong, Yangyang Wang, Bobby G. Sumpter, Rigoberto Advincula, Rajeev Kumar
Summary: In this study, the conformational hypotheses of polyzwitterions (PZs) in dilute aqueous solutions are tested by investigating the effects of added salt on the gyration and hydrodynamic radii of poly(sulfobetaine methacrylate). The results reveal the importance of salt in affecting the net charge and conformations of PZs, with the observations of antipolyelectrolyte and polyelectrolyte effects.
