Ultrahigh mobility and efficient charge injection in monolayer organic thin-film transistors on boron nitride
Daowei He,Jingsi Qiao,Jingsi Qiao,L. Zhang,Junya Wang,Junya Wang,Tu Lan,Jun Qian,Yun Li,Yi Shi,Yang Chai,Wei Lan,Luis K. Ono,Yabing Qi,Jianbin Xu,Wei Ji,Wei Ji,Xinran Wang +17 more
TLDR
The results suggest that highly crystalline molecular monolayers are promising form factors to build high-performance OTFTs and investigate device physics and allow us to precisely model how the molecular packing changes the transport and contact properties.Abstract:
Organic thin-film transistors (OTFTs) with high mobility and low contact resistance have been actively pursued as building blocks for low-cost organic electronics. In conventional solution-processed or vacuum-deposited OTFTs, due to interfacial defects and traps, the organic film has to reach a certain thickness for efficient charge transport. Using an ultimate monolayer of 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) molecules as an OTFT channel, we demonstrate remarkable electrical characteristics, including intrinsic hole mobility over 30 cm2/Vs, Ohmic contact with 100 Ω · cm resistance, and band-like transport down to 150 K. Compared to conventional OTFTs, the main advantage of a monolayer channel is the direct, nondisruptive contact between the charge transport layer and metal leads, a feature that is vital for achieving low contact resistance and current saturation voltage. On the other hand, bilayer and thicker C8-BTBT OTFTs exhibit strong Schottky contact and much higher contact resistance but can be improved by inserting a doped graphene buffer layer. Our results suggest that highly crystalline molecular monolayers are promising form factors to build high-performance OTFTs and investigate device physics. They also allow us to precisely model how the molecular packing changes the transport and contact properties.read more
Citations
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Organic crystalline materials in flexible electronics
Yu Wang,Lingjie Sun,Cong Wang,Fangxu Yang,Xiaochen Ren,Xiaotao Zhang,Huanli Dong,Wenping Hu,Wenping Hu +8 more
TL;DR: In this paper, the crystal packing, charge transport, and assembly protocols of organic crystalline materials (OCMs) are introduced, and state-of-the-art construction strategies for aligned/patterned OCM on/into flexible substrates are discussed in detail.
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Contact Resistance in Organic Field‐Effect Transistors: Conquering the Barrier
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Molecular Semiconductors for Logic Operations: Dead-End or Bright Future?
TL;DR: This critical review addresses the community of chemists and materials scientists to share with it a critical analysis of the best performing molecular semiconductors and of the inherent charge transport physics that takes place in them.
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Monolayer Two-dimensional Molecular Crystals for an Ultrasensitive OFET-based Chemical Sensor.
Haiyang Li,Yanjun Shi,Guangchao Han,Jie Liu,Jing Zhang,Chunlei Li,Yuanping Yi,Tao Li,Xike Gao,Chong-an Di,Jia Huang,Yanke Che,Dong Wang,Wenping Hu,Yunqi Liu,Lang Jiang +15 more
TL;DR: For the first time, an ultrasensitive (sub‐ppb level) sensor is reported that exploits n‐type monolayer molecular crystals (MMCs) with porous two‐dimensional structures that enables direct detection of solid analytes of biological amine derivatives at an extremely low concentration of 500 ppb.
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2D-Organic Hybrid Heterostructures for Optoelectronic Applications.
Jia Sun,Jia Sun,Yongsuk Choi,Young Jin Choi,Seongchan Kim,Jin-Hong Park,Sungjoo Lee,Jeong Ho Cho +7 more
TL;DR: A comprehensive review of emerging 2D-organic heterostructure-from their synthesis and fabrication to their state-of-the-art optoelectronic applications-is presented and future challenges and opportunities associated with these heterostructures are highlighted.
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