Article
Chemistry, Physical
Ranganath Wahalathantrige Don, Priyanka Das, Ziyuan Ma, Udara M. M. Kuruppu, Daijun Feng, Brian Shook, Mahesh K. K. Gangishetty, Mihaela C. C. Stefan, Nihar R. R. Pradhan, Colleen N. N. Scott
Summary: This paper describes the synthesis, characterization, and application of the first vinyl-flanked DPP polymers and investigates the effect of vinyl group position on the physical and optoelectrical properties of the polymers. The polymers exhibit moderate molecular weights, good solubility, and high thermal stabilities. One of the polymers is used as a coating material in a MoS2 FET device and shows higher photoresponsivity in the NIR region.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Seonghun Jeong, Hyeonjin Yoo, Yongjoon Cho, Seong-Jun Yoon, Byoung Hoon Lee, Changduk Yang
Summary: This study introduces strong electron-rich fused-ring dithienopyran (DTP) unit into organic field-effect transistor (OFET) materials and synthesizes different types of copolymers based on it for device applications. The donor-acceptor (D-A) type copolymers show higher charge-carrier mobilities and better thermal stability compared to the donor-donor (D-D) type copolymers, attributed to enhanced crystalline features and preferential 3D-textured molecular orientation.
Article
Chemistry, Multidisciplinary
Jibin J. Samuel, Ashutosh Garudapalli, Aiswarya Abhisek Mohapatra, Chandrasekhar Gangadharappa, Satish Patil, Naga Phani B. Aetukuri
Summary: The study proposes the use of triethylene glycol-functionalized DPP-based polymer as an ideal channel material for ambipolar OECTs, showing high performance in both n- and p-type operations and demonstrating logic operations with complementary circuits. This research represents an important step towards developing sophisticated logic circuits using single-component OECTs.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Organic
Wansong Shang, Guangchao Han, Qingrui Fan, Xiaobo Yu, Dongsheng Liu, Cheng Li, Xi-Sha Zhang, Yuanping Yi, Guanxin Zhang, Deqing Zhang
Summary: In this paper, a new quinoid molecule with a long conjugation length is synthesized and found to exhibit strong absorption in the near-infrared region. The thin film of this molecule shows balanced ambipolar semiconducting properties with high hole and electron mobilities.
ORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Physics, Applied
P. Riederer, C. Eckel, R. T. Weitz, R. Kersting
Summary: Terahertz electromodulation spectroscopy is used to investigate charge transport in PDPP3T. Both electrons and holes exhibit band transport along the polymer chain. In devices with oriented thin-films, electron and hole mobilities of 2.0 and 12.8 cm^2/V s are measured, respectively. Temperature-resolved and long-time measurements suggest that only a fraction of the injected charge carriers participate in band transport, and carrier trapping into localized states is identified as the major factor limiting overall mobilities. The observed mobilities are expected to be significantly lower than the material's inherent mobilities according to the Ioffe-Regel criterion.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Ulrike Salzner
Summary: The study investigates the unknown properties of Diketopyrrolopyrrole (DPP) homopolymers, suggesting they may have significantly wider conduction bands and n-type conductivity. Comparisons with other unknown donor-acceptor systems show that DPP substitution can reduce bandwidths and decrease electron affinities.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Analytical
Young Jin Choi, Jihyun Kim, Min Je Kim, Hwa Sook Ryu, Han Young Woo, Jeong Ho Cho, Joohoon Kang
Summary: Donor-acceptor-type organic semiconductor molecule PDPPT-TT shows potential for both ambipolar field-effect transistors and non-volatile memory device applications. The non-volatile memory device based on PDPPT-TT with a gold nanoparticle-embedded dielectric layer exhibits clear memory window formation and electrical stability.
Article
Engineering, Electrical & Electronic
Andrey B. Pashkovskii, Sergey A. Bogdanov, Askhat K. Bakarov, Alexandr B. Grigorenko, K. S. Zhuravlev, Vladimir G. Lapin, Vladimir M. Lukashin, Ilya A. Rogachev, Evgeniy Tereshkin, Sergey Shcherbakov
Summary: In this article, a GaAs millimeter-wave pseudomorphic high-electron-mobility transistor (pHEMT) using sophisticated AlGaAs-InGaAs-GaAs heterostructure is presented, demonstrating high mobility and high density of two-dimensional electron gas. The transistor shows impressive RF characteristics with high specific output RF power.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Chemistry, Physical
Qian Liu, Waner He, Yongqiang Shi, Sultan Otep, Wen Liang Tan, Sergei Manzhos, Christopher R. McNeill, Xugang Guo, Prashant Sonar, Tsuyoshi Michinobu, Aung Ko Ko Kyaw
Summary: This study demonstrates the directional tunability of carrier polarity in organic ambipolar transistors using DPP- and BTI-based dual-acceptor polymers. By modifying the molecular structure and adding specific ionic additives, the polarity of charge carriers can be selectively tuned, enabling the transition from ambipolar to unipolar transport in organic field-effect transistors. This finding is highly significant for the development of complementary circuits.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Analytical
Sopan M. Wagalgave, Mohammad Al Kobaisi, Sidhanath Bhosale, Sheshanath Bhosale
Summary: This study investigated the impact of rational design of DPP donor units with merocyanine linkers on the optical, electrochemical properties, and photovoltaic performance of BHJ devices using DPP3 and DPP4 as donor materials and PC61BM as an acceptor moiety. The results showed that DPP4 had lower power conversion efficiency but higher short-circuit current compared to DPP3, indicating the importance of designing donor units for BHJ devices.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Yeonhwa Cho, Taehoon Kim, Woongki Lee, Hwajeong Kim, Youngkyoo Kim
Summary: Here, we present the fabrication and characterization of ambipolar organic phototransistors (OPTRs) with sensing channel layers of a conjugated terpolymer, PDPP-8OBT-NDI. The OPTRs exhibited well-balanced ambipolar characteristics at a wide voltage range and showed high photosensitivity in the near-infrared (NIR) region. The devices also displayed stable and reproducible photocurrent responses under continuous NIR light illumination and optical on/off modulation.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Applied
Jong-Woon Ha, Yina Moon, Minho Yoon, Doyeon Kim, Do-Hoon Hwang, Jiyoul Lee
Summary: This study investigates the structure-property relationship of donor-acceptor (D-A) type conjugated copolymers containing two electron accepting units, TIQO and BT, with or without fluorine substitution. DFT calculations and X-ray diffraction results reveal the energy levels, planarity, and pi-pi stacking characteristics of the copolymers. The PTIQO-FBT copolymer exhibits longer pi-pi stacking coherence length and better balance in hole and electron transport in OFETs, showing higher field-effect mobility compared to other copolymers.
Article
Chemistry, Multidisciplinary
Tugba Haciefendioglu, Erol Yildirim
Summary: This study models, analyzes, and compares over 50 different acceptor units using computationally extracted data from density functional theory. It finds that the structural properties of acceptor units have a dominant effect on their frontier electronic energy levels, particularly the dihedral angle between the acceptor, donor, and bridge units, bond order, and hyperpolarizability.
Article
Chemistry, Physical
Xin Chang, Mohammad Balooch Qarai, Frank C. Spano
Summary: A vibronic exciton model was developed to explain the spectral signatures of HJ-aggregates in oligomers and polymers with donor-acceptor-donor repeat units. The model shows that single chains with enhanced intrachain order exhibit J-behavior, while positive H-promoting interchain Coulomb interactions in aggregates attenuate the vibronic ratio. The ratio formula derived previously for P3HT aggregates was shown to also apply to (DAD)(N) aggregates with slight modifications.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Sonia Kotowicz, Mateusz Korzec, Agnieszka Katarzyna Pajak, Sylwia Golba, Jan Grzegorz Malecki, Mariola Siwy, Justyna Grzelak, Sebastian Mackowski, Ewa Schab-Balcerzak
Summary: In this study, six novel symmetrical bis-(imino-1,8-naphthalimides) compounds with different core and N-substituent structures were synthesized and characterized for their thermal, optical, and electrochemical properties. The compounds showed stability at high temperatures and demonstrated electrochemical activity for reductions and oxidations. They had deep LUMO levels and emitted light from blue to yellow, with potential for light emission under voltage in devices incorporating neat compounds or blends with PVK:PBD.
Article
Polymer Science
Yankai Zhou, Shiying Zhang, Weifeng Zhang, Jianyao Huang, Congyuan Wei, Liping Wang, Gui Yu
Summary: This study introduced versatile alkoxycarbonyl substituents onto the azaisoindigo-based polymeric pi-skeleton, leading to the synthesis of two novel polymers. Experimental results showed that alkoxycarbonyl substituents can effectively modulate the properties of conjugated polymers, enhancing solubility and optimizing molecular packing. All field-effect transistors based on these polymers exhibited ambipolar carrier transport characteristics, indicating the potential of alkoxycarbonyl substituents in fine-tuning the semiconducting properties of conjugated polymers.
Review
Chemistry, Multidisciplinary
Xuyang Wei, Weifeng Zhang, Gui Yu
Summary: This review focuses on the development of semiconducting polymers in electronic applications and the influence of diverse polymer structures on their optoelectronic properties. It particularly highlights the research and applications of polymers based on isoindigo and its derivatives in organic electronics, emphasizing the importance of structural modification on polymer performance.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Hao Li, Weifeng Zhang, Jie Xu, Le Cai, Zhiwei Yu, Tianbao Ma, Yuanhui Zheng, Liping Wang, Gui Yu
Summary: The research successfully synthesized two magnetic 2D conjugated polymers, obtaining few-layer nanosheets through liquid-phase exfoliation. Magnetic properties and radical characteristics were studied using superconducting quantum interference device magnetometer and electron spin resonance spectroscopy. The intrinsic magnetism of the nanosheets can be attributed to stable radicals, nanoporous structures, and N-doped zigzag edges in their graphene-like skeletons.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Miao Yu, Yu Chen, Yong-Gang Chen, Zhi-Yong Yang, Wei-Feng Zhang, Gui Yu
Summary: The photodetecting performances of polymer/graphene hybrid films were successfully tuned from broadband to IR/UV sensitive through a simple thermal treatment, showcasing different working modes for varied demands. The synergistic effect between the Fermi level of graphene and the morphologies of polymer films was found to be responsible for the altered sensitivities to different radiations. This study not only proposed a multimode photodetecting device for different applications, but also revealed the intrinsic mechanisms and robust capabilities of simple thermal treatments on tuning activities of polymer/graphene devices.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Zhihui Chen, Jianyao Huang, Weifeng Zhang, Yankai Zhou, Xuyang Wei, Jinbei Wei, Yuanhui Zheng, Liping Wang, Gui Yu
Summary: This study investigates the impact of methyl and methoxy substitutions on the field-effect performance of polymers, revealing that these two substituents affect the backbone conformation and increase the energy levels of the polymers. Leveraging these electronic effects allows for the control of charge transport behaviors, enabling tuning from n-channel to ambipolar behavior.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Review
Chemistry, Multidisciplinary
Jiadi Chen, Weifeng Zhang, Liping Wang, Gui Yu
Summary: Organic electronics has made significant progress, thanks to the development of organic electronic devices and the diversity of organic semiconductor materials, especially high electron mobility n-type organic small-molecule semiconductors. These materials have advantages such as simple synthesis process, strong intermolecular stacking, tunable molecular structure, and easy functionalization, making them crucial for constructing complementary logic circuits and p-n heterojunction structures.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Weifeng Zhang, Keli Shi, Jing Lai, Yankai Zhou, Xuyang Wei, Qian Che, Jinbei Wei, Liping Wang, Gui Yu
Summary: Two novel donor-acceptor copolymers, PNFFN-DTE and PNFFN-FDTE, are designed and synthesized for fabricating polymer field-effect transistors (PFETs). The PNFFN-FDTE-based PFETs processed with a bicomponent solvent exhibit the highest electron mobility reported so far, which is attributed to the fully locked conjugated backbone and dense molecular packing of PNFFN-FDTE.
ADVANCED MATERIALS
(2023)
Article
Polymer Science
Xuyang Wei, Yuchai Pan, Weifeng Zhang, Yankai Zhou, Hao Li, Liping Wang, Gui Yu
Summary: A novel method for constructing polymeric conjugated radicals is reported in this study, which introduces an open-shell benzo-bisthiadiazole (BBT) unit to a closed-shell (traditional polymer) (3E,7E)-3,7-bis(2-oxo-1H-pyrrolo-[2,3-b]pyridine-3(2H)ylidene) benzo[1,2-b:4,5-b']difuran-2,6(3H,7H)-dione-alt-(E)-1,2-dithiophen-2-yl)ethene polymeric conjugated backbone (P1), resulting in conjugated polymers P2-P4 with open-shell characteristics. The spin characteristic of the polymer conjugated radicals can be easily tuned, and the spin concentration increases with the increase of the BBT ratio. P2-P4 exhibit narrowed energy gaps and n-type charge transport properties with electron mobilities of 0.12-0.35 cm2 V-1 s(-1), comparable to or higher than those of BBT-containing conjugated polymers reported so far. Gradual decrease of μe from P1 to P4 is attributed to the deterioration of molecular aggregation caused by BBT in solid thin films. Incorporating an open-shell moiety into a high-performance conjugated backbone is a promising method for developing polymeric conjugated radicals with high mobility and tunable open-shell character.
Article
Chemistry, Multidisciplinary
Yuchai Pan, Weifeng Zhang, Yankai Zhou, Xuyang Wei, Hao Luo, Jinbei Wei, Liping Wang, Gui Yu
Summary: In this study, three novel electron-deficient aromatics (NCCN, NFFN, and NNNN) and their derived donor-acceptor (D-A) copolymers (PNCCN-FBT, PNFFN-FBT, and PNNNN-FBT) were reported. The incorporation of heteroatoms in the compounds increased their backbone planarity and improved the molecular packing in the thin film. The CN-processed PNCCN-FBT polymer showed ambipolar transport characteristics, while the PNFFN-FBT and PNNNN-FBT polymers exhibited n-type transport characteristics with high electron mobility. The lower frontier molecular orbital energy levels of PNFFN-FBT were identified as the key factor for its higher electron mobility.
Article
Polymer Science
Yankai Zhou, Qian Che, Weifeng Zhang, Hao Li, Xuyang Wei, Xitong Liu, Liping Wang, Gui Yu
Summary: This study reports a series of polymers based on Isoquinoline-1,3-dione (IQD), a novel electron-withdrawing building block. The polymers were synthesized through aldol condensation reactions between IQD and the dialdehyde of thieno[3,2-b]thiophene (TT), 2,2 '-bithiophene (BT), and (E)-2(2-(thiophen-2-yl)vinyl)thiophene (TVT). The resulting polymers showed high charge transport properties, with P2 and P3 exhibiting p-type behavior and among the highest hole mobilities reported for IQD-based polymers.
Review
Materials Science, Multidisciplinary
Yunchao Zhang, Weifeng Zhang, Liping Wang, Gui Yu
Summary: This paper reviews the synthetic strategies of semiconducting polymers based on diarylethylene units and discusses the molecular engineering of diarylethylene units on polymers and the effects of various structural modifications on the properties. The applications of these polymers in electronic devices are discussed, and the challenges and future outlook in this field are highlighted.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Dong Li, Yuanhui Zheng, Mingwei Yang, Congyuan Wei, Xitong Liu, Naihang Zheng, Weifeng Zhang, Kuijuan Jin, Gui Yu
Summary: The organic interlayer in organic spin valves plays a crucial role in device performance. In this study, conjugated polymers based on isoindigo derivatives were used to fabricate organic spin valves, and the dependence of performance on polymer structure was investigated.
ACS MATERIALS LETTERS
(2022)
Review
Chemistry, Multidisciplinary
Yankai Zhou, Weifeng Zhang, Gui Yu
Summary: Organic semiconductor materials, especially donor-acceptor polymers, have been increasingly used in organic optoelectronic devices, achieving high performance in devices like organic field-effect transistors and organic solar cells. Researchers focus on the structural evolution of acceptor moieties and their impact on the properties of the polymers.
Article
Polymer Science
Yuchai Pan, Jianyao Huang, Dong Gao, Zhihui Chen, Weifeng Zhang, Gui Yu
Summary: Semiconducting polymers play a crucial role in both industrial and academic purposes, with ongoing research focusing on the structure-performance relationship. By improving structural engineering, new semiconducting polymers with enhanced properties can be developed. Through studying a series of diketopyrrolopyrrole-based polymers with different alkyl chain lengths, a strong correlation between electrical performance and alkyl side chain was observed, leading to a comprehensive understanding of design rules for high-performance semiconductor materials.
