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)
Article
Chemistry, Multidisciplinary
Junhwan Choi, Chungryeol Lee, Juyeon Kang, Changhyeon Lee, Seung Min Lee, Jungyeop Oh, Sung-Yool Choi, Sung Gap Im
Summary: This paper presents a universal strategy to synthesize high-k hybrid dielectric materials by incorporating a high-k polymer layer on top of various inorganic layers generated by different fabrication methods. These hybrid dielectric materials have high capacitance and excellent insulating properties, and can achieve stable operation at ultralow voltages.
Article
Chemistry, Physical
Yuanwei Zhu, Nan Qiao, Shuqi Dong, Guanghao Qu, Yu Chen, Wanlong Lu, Zongze Qin, Dongfan Li, Kangning Wu, Yongjie Nie, Bo Liu, Shengtao Li, Guanghao Lu
Summary: In this study, a series of fluorinated polystyrene isomers were designed through side-chain engineering. By enhancing molecular charge separation and electrostatic potential, the dielectric constant and charge trapping performance were improved, leading to enhanced photon memory and artificial synapse performance.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yingshuang Zheng, Hongzhen Lin, Ting Jiang, Dongyang Zhu, Shengli Qi, Wei Li, Liqiang Li, Deyang Ji, Wenping Hu
Summary: The disordered chain arrangement of polymer dielectrics affects the system performance, making it difficult to achieve band-like transmission of vapor-deposited organic small molecule films (VDOSMFs). In this study, three types of bi-polymer dielectrics were developed to modulate charge transport from thermally activated mode to band-like transport at the interfacial level. The polyimide layer in the bottom plays a crucial role in interfacial modulation, selectively binding with the up-dielectric layers to control charge transport.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Polymer Science
Po-Hsiang Fang, Peng-Lin Kuo, Yu-Wu Wang, Horng-Long Cheng, Wei-Yang Chou
Summary: In this study, aluminum oxide (AlOx) was used as the dielectric material in organic field-effect transistors (OFETs) to lower threshold and operating voltages, and achieve high electrical stability and retention in OFET-based memory devices. By modifying the gate dielectric with different solid contents of polyimide (PI), the stability of PTCDI-C-13-based OFETs was improved by reducing trap state density. The use of PI compensated for gate field-induced stress and enhanced the performance and stability of the OFET. Furthermore, the OFET-based memory devices with PI film showed good retention and durability.
Article
Engineering, Electrical & Electronic
Sachin Rahi, Vivek Raghuwanshi, Pulkit Saxena, Gargi Konwar, Shree Prakash Tiwari
Summary: This study demonstrates flexible organic field-effect transistors (OFETs) with a PVA/PAA bilayer gate dielectric. These devices exhibit high electrical stability and electromechanical stability, and can be used for circuit applications.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Nanoscience & Nanotechnology
Ting Xu, Yifan Liu, Yunlong Bu, Shiyao Shu, Shuangqing Fan, Minghui Cao, Tong Liu, Jiawei Zou, Jie Su
Summary: This study proposes a new strategy to enhance the performance of organic field-effect transistors (OFETs) by introducing high-dipole-moment groups into polymer side chains. The synthesized polymers not only have high dielectric constant and high electrical insulating property, but also favor the growth of organic semiconductor films. The flexible OFETs exhibit excellent mechanical flexibility, high stability, and multi-level memory capability.
ADVANCED ELECTRONIC MATERIALS
(2023)
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
Chemistry, Multidisciplinary
Hyeok-jin Kwon, Heqing Ye, Kyuwon Shim, Henok Getachew Girma, Xiaowu Tang, Bogyu Lim, Yejin Kim, Jihoon Lee, Chan Eon Park, Seo-Hyun Jung, Jong Mok Park, Yu Jin Jung, Do-Hoon Hwang, Hoyoul Kong, Se Hyun Kim
Summary: New solution-processable copolymers containing carboxyl and hydrophobic functionalities were synthesized, with the use of a fluorophenyl azide (FPA) based UV-assisted crosslinker to promote the movement of polar carboxyl groups and hydrophobic functionalities in thin film. This strategy maintained high dielectric constant characteristics and hydrophobic surface, eliminating trapsites and allowing stable operation and efficient charge transport.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Baotieliang Wang, Ting Xu, Bo Yu, Jiawei Zou, Shifang Luan
Summary: In this study, the performance of organic thin-film transistors (OTFTs) was improved by modifying the alkyl side chain length of polyimide (PI) materials. The OTFTs exhibited high mobility, low operating voltage, hysteresis-free behavior, and high operational stability.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Heqing Ye, Hyeok-jin Kwon, Su Cheol Shin, Hwi-young Lee, Young Ho Park, Xiaowu Tang, Ruxian Wang, Kanghyuck Lee, Jisu Hong, Zhijun Li, Wonkyo Jeong, Jiyeong Kim, Chan Eon Park, Jihoon Lee, Tae Kyu An, Insik In, Se Hyun Kim
Summary: This study demonstrates a novel strategy to induce high-k characteristics with durable polysilsesquioxane (PSQ)-based dielectrics, paving the way for the production of practical and printable high-k dielectrics for low-voltage-operating high-performance organic field-effect transistors (OFETs). Different PSQs exhibit distinct polarization phenomena, leading to different hysteresis behaviors during device operation.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Applied
Yanyan Chen, Mingxiang Wang, Dongli Zhang, Huaisheng Wang, Wei Deng, Jialin Shi, Jiansheng Jie
Summary: The study found that organic thin film transistors are more sensitive to moisture vapor, but both moisture vapor and O-2 can cause instability in the transistors. By comparing the effects of different sealing materials, it was discovered that the CYTOP/UV adhesive bilayer passivation combines the advantages of both materials, enabling OTFTs to resist saturated moisture vapor and oxygen for 25 days.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Rongxiang He, Aifeng Lv, Xingyu Jiang, Chang Cai, Yazhou Wang, Wan Yue, Lizhen Huang, Xue-Bo Yin, Lifeng Chi
Summary: To improve the ionic transport property of hydrophobic conjugated polymers used in organic electrochemical transistors (OECTs), hydrophilic side chains are often grafted onto the polymers. However, this modification decreases the charge transport ability. In this study, an ionic gel interfacial layer composed of gel matrix and ionic liquids is applied to enhance the ionic transport while maintaining the charge transport ability of the polymers. The proposed strategy enables the realization of OECTs with hydrophobic conjugated polymers and achieves high performance through tunable variations in the types and ratios of ionic gels.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
V. R. Rajeev, Sradha Pillai, Jean-Michel Nunzi, Narayanan K. N. Unni
Summary: The study demonstrates that using a high molecular weight PMMA gate dielectric and a solvent with high dipole moment can significantly improve the electrical properties of OFETs, which is related to the surface energy of the dielectric.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2022)
Review
Chemistry, Physical
Yuchai Pan, Gui Yu
Summary: Organic field-effect transistors (OFETs) are important foundational devices in organic electronics with great potential in various applications. Using multicomponent blend systems has been proven to be an effective way to promote the development of OFETs, combining the advantages of different components to provide enhanced properties.
CHEMISTRY OF MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Zhong-Da Zhang, Xu Gao, Jie Luo, Ya-Nan Zhong, Jian-Long Xu, Sui-Dong Wang
Summary: An organic field-effect transistor nonvolatile memory with multibit storage capability and selective UV response was demonstrated. The memory showed good retention for all states, and the switching between states was controlled by programming/erasing pulses rather than voltage or duration.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Cong Shen, Xu Gao, Cheng Chen, Shan Ren, Jian-Long Xu, Yi-Dong Xia, Sui-Dong Wang
Summary: An optoelectronic synapse based on ZnO nanowire transistor has been achieved in this work, which can emulate both short-term and long-term synaptic plasticity. It has high recognition accuracy and great potential in the development of neuromorphic visual systems.
Article
Nanoscience & Nanotechnology
Pratik Kumar, Kaichen Zhu, Xu Gao, Sui-Dong Wang, Mario Lanza, Chetan Singh Thakur
Summary: This article highlights the importance of utilizing two-dimensional materials in the fabrication of integrated circuits. It also presents a hybrid architecture combining a hexagonal boron nitride crossbar array with CMOS circuitry to implement the extreme learning machine algorithm. The experimental results demonstrate the superior performance of this hybrid architecture in complex classification tasks.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Daqian Si, Zhihao Zhang, Zhiqiang Wang, Yinci Chen, Xu Gao, Bo Da, Hongxuan Guo, Litao Sun
Summary: In this study, nanopatterned hydrogels were fabricated using a scanning electron microscope. The distribution of electron scattering to induce hydrogel cross-linking was analyzed through an optimized Monte Carlo simulation with Pearson correlation coefficient analysis. The study found that the feature size of poly(ethylene glycol) diacrylate hydrogel was approximately 280 nm under certain conditions. This research provides a solution for the miniaturized preparation of nanohydrogels, which can enhance the density of arrays in nanosensors.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Hao Zong, Min Wang, Weinan Chen, Zhong-Da Zhang, Jia-Wei Cai, Cong Shen, Li-Xing Li, Shui-Long Kang, Yuan Fang, Gang Zhou, Sui-Dong Wang
Summary: A comparison of organic single crystals of different dimensions but with the same material reveals insights into their carrier injection mechanism. Two-dimensional (2D) and microrod single crystals with identical crystalline structure of a thiopyran derivative, C8-SS, were grown on a glycerol surface. Organic field-effect transistors (OFETs) based on the 2D C8-SS single crystal exhibit superior performance, especially in contact resistance (RC). RC is found to be influenced by the resistance of the crystal bulk in the contact region, with the 2D OFETs having significantly reduced RC due to their tiny thickness. The 2D OFETs demonstrate high operational stability and channel mobility up to 5.7 cm2/V center dot s, highlighting the potential of 2D molecular single crystals in organic electronics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Zhao-Yang Yin, Yang Chen, Yang-Yang Zhang, Yu Yuan, Qian Yang, Ya-Nan Zhong, Xu Gao, Jing Xiao, Zhao-Kui Wang, Jian-Long Xu, Sui-Dong Wang
Summary: This study demonstrates that surface defects induced by iodine vacancies are the main cause of the dark current density (J(dark)) in perovskite photodiodes. By passivating the surface defects through a simple treatment, low J(dark) and enhanced photoresponse are achieved. The critical role of surface defects suggests that making trap-free perovskite thin films is a top priority for high-performance perovskite photodiodes.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yang Liu, Yiyuan Gao, Qian Yang, Gao Xu, Xingyu Zhou, Guozheng Shi, Xingyi Lyu, Hao Wu, Jun Liu, Shiwen Fang, Muhammad Irfan Ullah, Leliang Song, Kunyuan Lu, Muhan Cao, Qiao Zhang, Tao Li, Jianlong Xu, Suidong Wang, Zeke Liu, Wanli Ma
Summary: We achieved a low-cost and scalable synthesis of SWIR PbS quantum dot inks for the first time through an extensive investigation of reaction kinetics. The solar cell based on these PbS SWIR quantum dot inks exhibited a record-high power conversion efficiency of 1.44% with an 1100 nm cutoff silicon filter, and the photodetector device showed a low dark current density of 2x10(-6) A cm(-2) at -0.8 V reverse bias and a high external quantum efficiency of 70% at approximately 1300 nm. Our results realize the direct synthesis of low-cost and scalable SWIR quantum dot inks and may accelerate the industrialization of consumer SWIR technologies.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Meng-Ting Jiang, Qian Yang, Jian-Long Xu, Yu Yuan, Jing-Yue Zhang, Ya-Nan Zhong, Xu Gao, Sui-Dong Wang
Summary: Monolithically integrated pixels with stacked PbS colloidal quantum dot (CQD) photodiodes and organic blocking diodes are developed for short-wavelength infrared (SWIR) crossbar imaging arrays. These pixels exhibit normally-OFF behavior due to hole blocking under zero and forward biases. This monolithic integration effectively suppresses electrical crosstalk and reduces standby power consumption, resulting in a high-performance visible-SWIR imaging sensor.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Chen-Hui Zhu, Xu Gao, Hai-Tian Huang, Li-Xing Li, Jian-Long Xu, Ya-Nan Zhong, Wei Tang, Xiao-Jun Guo, Sui-Dong Wang
Summary: A type of organic thin film neuromorphic devices with a planar two-terminal architecture has been developed for inhibitory regulation of synaptic weight upon selective UV illumination. The effect of cumulative hole trapping in the polymer electret layer has been demonstrated to modulate the device conductance in a nonvolatile manner. The device exhibits UV-induced long-term depression accompanied by enhanced short-term potentiation, suggesting its potential applications in photonic neuromorphic computing.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Engineering, Electrical & Electronic
Lurong Yang, Chenbo Huang, Qianqian Chen, Wei Zeng, Xiao-Jian She
Summary: This paper reports a vertical phototransistor based on nano heterojunction of perovskite nanocrystal and polymer semiconductor. The nano-heterojunction method significantly improves the device performance, reducing the dark current, enhancing the detectivity, and improving the stability of the photocurrent.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Hai-Tian Huang, Jie Luo, Jia-Ling Wu, Xue-Er Han, Zhong-Da Zhang, Jia-Wei Cai, Xu Gao, Jian-Long Xu, Ya-Nan Zhong, Bin Dong, Sofia M. Morozova, Sui-Dong Wang
Summary: This article presents a solution-processed memristor matrix that enables synchronous and controlled inter-device interaction. The behavior of the matrix, characterized by the ion redistribution effect and electrochromic feature, can emulate clustered synaptic plasticity, suggesting a new paradigm for synaptic devices.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Kaichen Zhu, Giovanni Vescio, Sergio Gonzalez-Torres, Julia Lopez-Vidrier, Juan Luis Frieiro, Sebastian Pazos, Xu Jing, Xu Gao, Sui-Dong Wang, Joaquin Ascorbe-Muruzabal, Juan A. Ruiz-Fuentes, Albert Cirera, Blas Garrido, Mario Lanza
Summary: Inkjet printing electronics is a fast-growing market, expected to reach 23 billion USD by 2026. Incorporating 2D materials, such as h-BN, can greatly enhance device properties and enable new applications. This study presents a cost-effective method for synthesizing h-BN inks and fabricating memristors with attractive stochastic properties for data encryption in electronic circuits.
Article
Physics, Applied
Qian Yang, Hao-Wen Huang, Gao Xu, Yu Yuan, Meng-Ting Jiang, Ya-Nan Zhong, Xu Gao, Jian-Long Xu, Sui-Dong Wang
Summary: This study demonstrates a simple and controlled method to optimize detectivity in PbS CQD SWIR photodetectors by reducing J(dark) through the introduction of self-formed AlOx and eliminating the influence of interfacial states on minority hole injection.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Organic
Weinan Chen, Hao Zong, Yujie Xie, Jianping Xu, Jia-Wei Cai, Sui-Dong Wang, Gang Zhou
Summary: This study successfully synthesized two series of polycyclic compounds containing chalcogenopyrano[3,2-b]chalcogenopyran subunits. By fusing two cyclopentadiene rings, the antiaromatic chalcogenopyrano[3,2-b]chalcogenopyrans were transformed into stable aromatic subunits, showing potential applications in organic semiconductors.
ORGANIC CHEMISTRY FRONTIERS
(2023)
