Article
Chemistry, Physical
Philip Bellchambers, Silvia Varagnolo, Corinne Maltby, Ross A. Hatton
Summary: This study introduces high-performance transparent copper grid electrodes that outperform conventional indium tin oxide electrodes for organic photovoltaic (OPV) applications. The fabrication method is cost-effective and efficient, with a faster process compared to conventional lithography. The ultra-narrow grid line spacing minimizes parasitic absorption losses, making it a promising solution for OPV devices.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Ping Ren, Runqiao Song, Yong Zhu, Brendan O'Connor, Jingyan Dong
Summary: The demand for cost-effective fabrication of printed flexible transistors has increased due to the need for flexible interface devices like e-skins, wearables, and medical patches. This study develops electrohydrodynamic printing processes to fabricate all components of polymer-based organic thin film transistors, streamlining the fabrication procedure. The fully EHD-printed OTFTs show good electrical performance and great mechanical flexibility, providing a cost-effective route for flexible electronics.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Biophysics
Sanghoon Baek, Hiroyuki Matsui, Taisei Mano, Ju An Park, Youngmin Jo, Yongwoo Lee, Shizuo Tokito, Jimin Kwon, Sungjune Jung
Summary: Organic thin-film transistors (TFTs) with an electrochemically functionalized sensing gate are promising platforms for wearable health-monitoring technologies. In this work, flexible printed dual-gate (DG) organic TFTs operating in the subthreshold regime are presented, achieving ultralow power and high sensitivity. An enzymatic lactate-sensing extended-gate electrode is integrated into the printed DG TFT, showing exceptional sensitivity (0.77) and ultralow static power consumption (10 nW) in physiological lactate monitoring with human saliva.
BIOSENSORS & BIOELECTRONICS
(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
Chemistry, Multidisciplinary
Hyeok-jin Kwon, Heqing Ye, Yonghwa Baek, Jisu Hong, Rixuan Wang, Yonghwan Choi, Ilgeum Lee, Chan Eon Park, Sooji Nam, Juyoung Kim, Se Hyun Kim
Summary: The novel fluorinated organic-inorganic hybrid material FAGPTi, synthesized successfully, exhibits long-term colloidal stability and excellent flexibility and insulating properties in OTFTs as a gate dielectric layer. Introducing a fluorinated precursor results in stable spherical composites with strong repulsive forces, allowing for efficient fabrication of electronic materials and devices with highly stable driving characteristics under severe bending conditions.
ADVANCED FUNCTIONAL MATERIALS
(2021)
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
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
Physics, Applied
Subhash Singh, Hiroyuki Matsui, Shizuo Tokito
Summary: In this study, low-operating-voltage organic thin-film transistors (OTFTs) and P-channel metal-oxide-semiconductor (PMOS) inverter circuits are fabricated on a flexible polyethylene naphthalate substrate, achieving high performance through the use of a specific organic semiconductor material and deposition methods. Experiment results demonstrate the impact of channel width on device performance.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Xiaowu Tang, Yohan Jo, Hyeok-Jin Kwon, Kaibin Wu, Zhijun Li, Seonghyeon Kim, Chan Eon Park, Tae Kyu An, Jihoon Lee, Se Hyun Kim
Summary: In this study, printable polymer series were synthesized and used as gate dielectrics for OTFTs. The effect of different polymer types on the driving stability of OTFTs was analyzed, with PFS-co-PVBCi (3:7) showing the best performance under continuous bias stress with almost negligible Vth shift. This research successfully implemented flexible OTFT and logic devices using printed PFS-co-PVBCi (3:7) dielectrics with stable operation properties.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Biochemistry & Molecular Biology
Honglong Ning, Xuan Zeng, Hongke Zhang, Xu Zhang, Rihui Yao, Xianzhe Liu, Dongxiang Luo, Zhuohui Xu, Qiannan Ye, Junbiao Peng
Summary: Flexible and fully transparent thin film transistors (TFT) were successfully fabricated using room temperature processes, showing excellent performance, transparency, and stability. These TFTs have great potential in smart, portable flexible display, and wearable device applications.
Review
Chemistry, Physical
Chenfang Sun, Tie Wang
Summary: The early determination of disease-related biomarkers can improve patient survival rate significantly. Therefore, explorations for new diagnosis technologies, such as optical and electrochemical methods, have been devoted to life and health monitoring. Organic thin-film transistor (OTFT), as a label-free, low-cost, facial, and rapid detection technology, has attracted significant attention. However, the reliability and accuracy of the biosensor need to be improved while ensuring sensitivity, selectivity, and stability.
Article
Chemistry, Multidisciplinary
Zachary J. Comeau, Nicole A. Rice, Cory S. Harris, Adam J. Shuhendler, Benoit H. Lessard
Summary: This study investigates the relationship between thin-films of phthalocyanines (Pcs) with various substituents and their response to the cannabinoid Delta(9)-tetrahydrocannabinol (THC) through organic thin-film transistor (OTFT) performance. The findings indicate that the morphology of semiconductor thin-films in Pc-based OTFT sensors can change significantly in the presence of analytes, driven by analyte-Pc coordination and film restructuring.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Review
Chemistry, Physical
Marco Roberto Cavallari, Loren Mora Pastrana, Carlos Daniel Flecha Sosa, Alejandra Maria Rodriguez Marquina, Jose Enrique Eirez Izquierdo, Fernando Josepetti Fonseca, Cleber Alexandre de Amorim, Leonardo Giordano Paterno, Ioannis Kymissis
Summary: Organic thin-film transistors (OTFTs) as gas sensor devices have shown remarkable performance in detecting important target analytes, with electronic properties modulated by molecular engineering. This manuscript provides a comprehensive review on the working principle of OTFTs for gas sensing, including device fabrication methods and recent applications of main organic semiconductors, alongside an outlook toward the future of this exciting technology.
Article
Polymer Science
Zhengran He, Ziyang Zhang, Kyeiwaa Asare-Yeboah, Sheng Bi, Jihua Chen, Dawen Li
Summary: This study demonstrated the use of a metal-containing semicrystalline polymer as an additive to mediate the thin film morphology of solution-grown, small-molecule organic semiconductors, resulting in improved performance of organic thin film transistors.
Article
Chemistry, Physical
Rafal Jendrzejewski, Natalia Majewska, Sayani Majumdar, Miroslaw Sawczak, Jacek Ryl, Gerard Sliwinski
Summary: Rubrene films with high crystalline content were successfully fabricated by matrix-assisted laser evaporation in this study, revealing the presence of spherulitic structures and nanowires. Minimal material decomposition and absence of RB peroxides were consistently shown, resulting in enhanced charge transport and carrier mobility close to the technologically accepted level, making these rubrene films attractive for spintronic and optoelectronic applications.
