Article
Chemistry, Multidisciplinary
Wanli Yang, Kui Feng, Suxiang Ma, Bin Liu, Yimei Wang, Riqing Ding, Sang Young Jeong, Han Young Woo, Paddy Kwok Leung Chan, Xugang Guo
Summary: This study reports two halogen-functionalized polymer mixed ionic-electronic conductors (PMIECs), f-BTI2g-TVTF and f-BTI2g-TVTCl, which exhibit deep-positioned lowest unoccupied molecular orbital and favorable polymer chain packing motif. Among them, f-BTI2g-TVTF delivers a state-of-the-art μC* of 90.2 F cm-1 V-1 s-1 in organic electrochemical transistors and an excellent power factor of 64.2 μW m-1 K-2 in organic thermoelectrics. These results shed light on the impacts of halogen atoms on developing high-performing n-type PMIECs.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Wenchang Wu, Kui Feng, Yimei Wang, Junwei Wang, Enmin Huang, Yongchun Li, Sang Young Jeong, Han Young Woo, Kun Yang, Xugang Guo
Summary: By changing the composition of the polymer, especially by increasing the content of selenophene, the performance of n-type polymers can be improved, enabling high-performance organic electrochemical transistors and biosensors.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Vianna N. Le, Joel H. Bombile, Gehan S. Rupasinghe, Kyle N. Baustert, Ruipeng Li, Iuliana P. Maria, Maryam Shahi, Paula Alarcon Espejo, Iain McCulloch, Kenneth R. Graham, Chad Risko, Alexandra F. Paterson
Summary: Organic mixed ionic-electronic conductors (OMIECs) have diverse performance requirements, and chemically doping them can be a simple and low-cost approach. However, challenges such as identifying new dopant materials and understanding design rules hinder its realization. In this study, a new n-dopant, TBA-OH, is introduced and shown to enhance the key performance metrics of OMIECs. Additionally, the positioning of TBA(+) counterion relative to the polymer backbone improves polaron delocalization. This work provides the first steps towards developing design guidelines for chemical doping in OMIECs.
Article
Chemistry, Multidisciplinary
Jiayao Duan, Genming Zhu, Junxin Chen, Chenyang Zhang, Xiuyuan Zhu, Hailiang Liao, Zhengke Li, Hanlin Hu, Iain McCulloch, Christian B. Nielsen, Wan Yue
Summary: Researchers have reported a new electron-deficient, fused polycyclic aromatic compound, TNR, with excellent n-type mixed conduction properties. By optimizing the side chains, the dominant molecular packing can be changed to support highly efficient mixed conduction properties across the bulk semiconductor film.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Tyler J. Quill, Garrett LeCroy, Armantas Melianas, Dakota Rawlings, Quentin Thiburce, Rajendar Sheelamanthula, Christina Cheng, Yaakov Tuchman, Scott T. Keene, Iain McCulloch, Rachel A. Segalman, Michael L. Chabinyc, Alberto Salleo
Summary: Passive ion pair uptake from an ion gel electrolyte into an OMIEC is demonstrated in high-speed solid-state devices, while no uptake is observed with a polymerized ionic liquid (PIL) electrolyte. This uptake is confirmed by X-ray photoelectron spectroscopy and X-ray scattering, showing morphological changes to the OMIEC. In situ Raman spectroscopy reveals a reorganization of both anions and cations during gating, suggesting potential benefits for neuromorphic devices based on OMIECs.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Youngseok Kim, Gunwoo Kim, Bowen Ding, Dahyun Jeong, Inho Lee, Sungjun Park, Bumjoon J. Kim, Iain McCulloch, Martin Heeney, Myung-Han Yoon
Summary: Organic mixed ionic-electronic conductors have great potential as implantable electrodes and active channels for circuit architectures. This study designs high-performance electrochemical diodes and elucidates the underlying mechanism and material requirements. The broad impact of organic electrochemical diodes is demonstrated.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jiayao Duan, Genming Zhu, Liuyuan Lan, Junxin Chen, Xiuyuan Zhu, Chaoyue Chen, Yaping Yu, Hailiang Liao, Zhengke Li, Iain McCulloch, Wan Yue
Summary: The primary challenge for n-type small-molecule organic electrochemical transistors (OECTs) is to improve electron mobility. In this study, a 10-ring-fused polycyclic pi-system was reported, which showed intramolecular noncovalent interactions, high pi-delocalization, and strong electron-deficient characteristics. The extended pi-conjugated system using the ring fusion strategy displayed improved electron mobility and achieved the highest mu C* value of 10.3 F cm(-1) V-1 s(-1) in n-type OECTs reported to date. This work highlights the importance of pi-conjugation extension in enhancing the performance of n-type small-molecule OECTs.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Roman Halaksa, Ji Hwan Kim, Karl J. Thorley, Peter A. Gilhooly-Finn, Hyungju Ahn, Achilleas Savva, Myung-Han Yoon, Christian B. Nielsen
Summary: Functionalized thiophenes in the 3-position are commonly used as building blocks for organic semiconductors. The non-centrosymmetric nature of these compounds has been utilized in synthetic design and has led to the development of polymers with different properties. The recent interest in 3-alkoxythiophene based polymers for bioelectronic applications brings attention to the regiochemistry of these systems and their attractive intramolecular interactions. By studying a series of six polythiophene derivatives with varying regiochemistry and comonomer composition, we investigate the geometrical and electronic effects on their properties.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Nanoscience & Nanotechnology
Lucas Q. Flagg, Lauren E. Asselta, Nicholas D'Antona, Tommaso Nicolini, Natalie Stingelin, Jonathan W. Onorato, Christine K. Luscombe, Ruipeng Li, Lee J. Richter
Summary: Organic mixed ionic electronic conductors (OMIECs) have great potential in various new technologies, but studying them in their operating state is difficult. This study presents a new approach to investigate the electrochemical switching of a prototypical OMIEC and finds that the crystalline regions are relatively hydrophobic and the potential-induced changes in crystal structure do not clearly correlate with the transistor performance.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Xiaokang Wang, Kejie Zhao
Summary: Organic mixed ionic-electronic conductors (OMIECs) are essential for flexible, bio-, and optoelectronics due to their unique mixed conduction capability. However, phase separation in two-phase OMIECs can lead to degraded performance of devices. In this study, a continuum theory was formulated to describe the phase separation in two-phase OMIECs, taking into account various factors such as polymer deformation, mixing with salts and solvents, electrostatic field, and two-phase interfaces. The theory was implemented into a finite element model and applied to study the mechanics and electrochemistry of an OMIEC channel in an organic electrochemical transistor (OECT) device. The computational model successfully replicated the experimental results and provided insights into the volumetric capacitance and the effects of deformation on the phase dynamics and electron-conducting behavior. This work establishes a theoretical basis for understanding the mechanics and electrochemistry of two-phase OMIECs.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Chemistry, Multidisciplinary
Siew Ting Melissa Tan, Alexander Giovannitti, Armantas Melianas, Maximilian Moser, Benjamin L. Cotts, Devan Singh, Iain McCulloch, Alberto Salleo
Summary: Organic electrochemical transistors (OECTs) have shown promising performance as transducers and amplifiers of low potentials due to their exceptional transconductance enabled by the volumetric charging of organic mixed ionic/electronic conductors (OMIECs). However, current approaches that directly conduct chemical reactions within the OECT electrolyte do not fully leverage the OECT's large transconductance, resulting in sub-unity transduction of gate to drain current. This study presents an alternative device architecture that separates chemical transduction and amplification processes to achieve high-gain chemical OECT transducers.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Giovanni Maria Matrone, Ugo Bruno, Csaba Forro, Claudia Lubrano, Stefano Cinti, Yoeri van de Burgt, Francesca Santoro
Summary: Researchers have developed an electrochemical neuromorphic organic device (ENODe) that functions as an artificial synapse, emulating neurotransmitter transmission and modulation while overcoming electrochemical and readout interferences. The platform replicates high-level biological processes and holds promise for tissue-integrated neuromorphic systems.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Raufar Shameem, Lukas M. Bongartz, Anton Weissbach, Hans Kleemann, Karl Leo
Summary: The ability of organic electrochemical transistors (OECTs) to combine ionic and electronic transport with large volumetric capacitance makes them ideal for bioelectronic applications. The use of solid electrolytes based on ionic liquids extends their applicability and enables large-area printable production. However, OECTs with solid electrolytes often exhibit pronounced hysteresis in the transfer curve, which needs to be understood for accurate characterization and reliable applications.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Jiayao Duan, Genming Zhu, Lewen Wang, Junxin Chen, Shengyu Cong, Xiuyuan Zhu, Yecheng Zhou, Zhengke Li, Iain McCulloch, Wan Yue
Summary: This study presents a design strategy for n-type small molecule mixed conductors by combining electron-deficient naphthalene bis-isatin and rhodanine acceptor units substituted with ethylene glycol (EG) chains. The resulting fused and planar semiconductors exhibit efficient mixed ionic-electronic conductors with high OECT electron mobility. The study also investigates the effect of the alkyl spacer on the conduction features of the small molecule materials. This work provides a new avenue for the development of high-performance small molecule mixed ionic and electronic conductors for OECT materials.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Jongho Kim, Xinglong Ren, Youcheng Zhang, Daniele Fazzi, Suraj Manikandan, Jens Wenzel Andreasen, Xiuming Sun, Sarah Ursel, Hio-Ieng Un, Sebastien Peralta, Mingfei Xiao, James Town, Arkadios Marathianos, Stefan Roesner, Thanh-Tuan Bui, Sabine Ludwigs, Henning Sirringhaus, Suhao Wang
Summary: Reported is the use of polynaphthalenediimide (PNDI)-based copolymers containing novel fluorinated selenophene-vinylene-selenophene (FSVS) units as efficient materials for n-type organic electrochemical transistors (OECTs) and organic field-effect transistors (OFETs). The PNDI polymers with oligo(ethylene glycol) (EG7) side chains P(NDIEG7-FSVS) achieved a high carrier mobility of > 0.2 F cm-1 V-1s-1, outperforming benchmark materials by two orders of magnitude. The conjugated polymer with octyldodecyl (OD) side chains P(NDIOD-FSVS) exhibited low energetic disorder and ultra-low activation energy, resulting in high electron mobility in n-type OFETs.
Editorial Material
Plant Sciences
Qing-Hai Wang, Shan-Yi Kuang, Yong-Chun Zeng, Xu-Juan Jiao, Yu-Mei Han, Jun-Wei Wang, Yi-Ji Peng, Xing-Hong Liu, Yang Zhang
Article
Polymer Science
Junwei Wang, Kui Feng, Sang Young Jeong, Bin Liu, Yimei Wang, Wenchang Wu, Yongxin Hou, Han Young Woo, Xugang Guo
Summary: This study successfully synthesized two polymers with excellent n-type characteristics by combining specific substituent benzochalcogenadiazole and diketopyrrolopyrrole building blocks, providing new building blocks and approaches for the development of n-type organic thermoelectric materials.
Article
Nanoscience & Nanotechnology
Suxiang Ma, Junwei Wang, Kui Feng, Hao Zhang, Ziang Wu, Yimei Wang, Bin Liu, Yongchun Li, Mingwei An, Raul Gonzalez-Nunez, Rocio Ponce Ortiz, Han Young Woo, Xugang Guo
Summary: We report a strongly electron-deficient dithienylpyrazinediimide (TPDI) and its n-type semiconducting polymers, which exhibit n-type transport character with an electron mobility of up to 0.44 cm2 V-1 s-1 in organic thin-film transistors. The incorporation of pyrazine into imide-functionalized (hetero)arenes is an effective strategy to develop high-performance n-type polymers for organic optoelectronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Jianfeng Li, Min Liu, Kun Yang, Yimei Wang, Junwei Wang, Zhicai Chen, Kui Feng, Dong Wang, Jianqi Zhang, Yongchun Li, Han Guo, Zhixiang Wei, Xugang Guo
Summary: By devising a novel selenophene-based electron-deficient building block, the pronounced advantages of selenium substitution in enabling advanced n-type polymers are demonstrated. The resulting selenium-substituted polymer achieves high conductivity and power factor, surpassing the sulfur-based analogue polymer by 40% conductivity increase. These results provide important insights for developing high-performing n-type organic thermoelectric materials.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Kui Feng, Wanli Yang, Sang Young Jeong, Suxiang Ma, Yongchun Li, Junwei Wang, Yimei Wang, Han Young Woo, Paddy Kwok Leung Chan, Gang Wang, Xugang Guo, Meifang Zhu
Summary: A new cyano-functionalized fused bithiophene imide dimer material with high electron deficiency was successfully synthesized and used as a building block to design a series of n-type polymers with good solubility and favorable polymer chain orientation. Among them, the acceptor-acceptor polymer PCNI2-BTI achieved excellent electrical conductivity (up to 150.2 S cm(-1)) and the highest power factor (110.3 μW m(-1) K-2) in n-type organic thermoelectrics, setting a new record for n-type polymers in this field.
ADVANCED MATERIALS
(2023)
Editorial Material
Plant Sciences
Feng-Ying Han, Yu-Kun Qi, Yu-Tong Zhang, Jian-Hua Qi, Jun-Wei Wang, Wen-Zhang Liu, Yan-Ping Ji, Qing-Hai Wang
Article
Multidisciplinary Sciences
Bin Liu, Huiliang Sun, Jin-Woo Lee, Zhengyan Jiang, Junqin Qiao, Junwei Wang, Jie Yang, Kui Feng, Qiaogan Liao, Mingwei An, Bolin Li, Dongxue Han, Baomin Xu, Hongzhen Lian, Li Niu, Bumjoon J. Kim, Xugang Guo
Summary: The degradation of kinetically trapped bulk heterojunction film morphology in organic solar cells is a major challenge for their practical use. In this study, the authors demonstrate highly thermally stable organic solar cells with a multicomponent photoactive layer synthesized through a simple one-pot polymerization method, achieving an efficiency of 11.8% and a T80 of 1000 hours. These findings provide a pathway for the development of low-cost and long-term stable organic solar cells.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Heng Liu, Zhengyu Lu, Weihai Zhang, Hongkang Zhou, Yu Xia, Yueqing Shi, Junwei Wang, Rui Chen, Haiping Xia, Hsing-Lin Wang
Summary: The buried interface between the perovskite and the electron transport layer is crucial for improving the efficiency and stability of perovskite solar cells (PSCs). In this study, a series of multifunctional organic-inorganic (OI) complexes were designed and synthesized as buried interfacial materials to enhance electron extraction and crystal growth of the perovskite. The OI complex with BF4- group eliminated oxygen vacancies on the SnO2 surface and balanced energy level alignment, while the OI complex with amine (-NH2) functional group regulated the crystallization of the perovskite film. The resulting PSCs with optimal OI complex buried interface layer achieved a champion device efficiency of 23.69% and demonstrated excellent ambient and light stability.
NANO-MICRO LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Xiaofei Ji, Leyu Bi, Qiang Fu, Bolin Li, Junwei Wang, Sang Young Jeong, Kui Feng, Suxiang Ma, Qiaogan Liao, Francis R. Lin, Han Young Woo, Linfeng Lu, Alex K. -Y. Jen, Xugang Guo
Summary: Adding Foamidinium Oxalate to SnO2 nanoparticles can improve the quality of SnO2/perovskite interface and enhance the efficiency and stability of perovskite solar cells.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Suxiang Ma, Bangbang Li, Shaokuan Gong, Junwei Wang, Bin Liu, Sang Young Jeong, Xihan Chen, Han Young Woo, Kui Feng, Xugang Guo
Summary: Researchers synthesized a highly pure and reactive electron-deficient biselenophene imide monomer and copolymerized it with a dibrominated monomer to develop high-performance polymer acceptors for all-polymer solar cells. The resulting polymer showed improved molecular weight, narrower band gap, and higher electron mobility compared to the donor-acceptor type counterpart. The all-polymer solar cells based on the new polymer achieved a remarkable efficiency of 17.77%.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Jianfeng Li, Zhicai Chen, Junwei Wang, Sang Young Jeong, Kun Yang, Kui Feng, Jie Yang, Bin Liu, Han Young Woo, Xugang Guo
Summary: Developing high-performance but low-cost n-type polymers for organic field-effect transistors (OFETs) remains a significant challenge. To achieve this, it is essential to design key electron-deficient units with simple structures and easy preparation processes, enabling the production of low-cost n-type polymers.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Nanoscience & Nanotechnology
Suxiang Ma, Junwei Wang, Wenchang Wu, Ziang Wu, Hao Zhang, Rifei Chen, Bin Liu, Kui Feng, Han Young Woo, Xugang Guo
Summary: In this study, sequential cyano substitution is used to transform the charge carrier polarity from p-type to n-type in organic electrochemical transistors (OECTs). The polythiophenes exhibit gradually lowered LUMO levels with the increase of cyano group number. Among them, polymer CNg4T2-CNT2 with the highest content of cyano groups shows highly promising n-type OECT performance.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Kui Feng, Junwei Wang, Sang Young Jeong, Wanli Yang, Jianfeng Li, Han Young Woo, Xugang Guo
Summary: This study reports on polymers based on fused bithiophene imide dimers, which incorporate different oligo(ethylene glycol) side chains to optimize electrical conductivity. The polymer PO12, with a moderate side-chain size, exhibits the highest electrical conductivity and power factor in organic thermoelectric devices. The results demonstrate the potential of side chain tuning for improving organic thermoelectric performance.
Article
Plant Sciences
Wandong Chen, Junwei Wang, Yulan Wu, Tai Yin, Yue Pan, Juan Wang
JOURNAL OF PLANT PATHOLOGY
(2023)
