-
Huei Shuan Tan, Yunlong Guo,
Haibin Su,
Ming Lin,
Jun Li,
Chong-An Di,
Beng S Ong,
Gui Yu,
Yuhua Zhou,
Yan Zhao,
Suo Hon Lim,
Yunqi Liu
-
[show abstract]
[hide abstract]
ABSTRACT: Existing organic imaging circuits, which offer attractive benefits of light weight, low cost and flexibility, are exclusively based on phototransistor or photodiode arrays. One shortcoming of these photo-sensors is that the light signal should keep invariant throughout the whole pixel-addressing and reading process. As a feasible solution, we synthesized a new charge storage molecule and embedded it into a device, which we call light-charge organic memory (LCOM). In LCOM, the functionalities of photo-sensor and non-volatile memory are integrated. Thanks to the deliberate engineering of electronic structure and self-organization process at the interface, 92% of the stored charges, which are linearly controlled by the quantity of light, retain after 20000 s. The stored charges can also be non-destructively read and erased by a simple voltage program. These results pave the way to large-area, flexible imaging circuits and demonstrate a bright future of small molecular materials in non-volatile memory.
Scientific Reports 01/2013; 3:1080.
-
[show abstract]
[hide abstract]
ABSTRACT: Two donor-acceptor (D-A) copolymer PDVTs based on diketopyrrolopyrole and (E)-2-(2-(thiophen-2-yl)vinyl)thiophene (TVT) units are synthesized for solution-processed field-effect transistors (FETs). The highly π-extended TVT units strengthen the coplanarity of the polymer backbone. FETs based on PDVTs show high mobilities above 2.0 cm(2) V(-1) s(-1) with a current on/off ratio of 10(5)-10(7) , high shelf storage, and operation stability.
Advanced Materials 06/2012; 24(34):4618-22. · 13.88 Impact Factor
-
Jing Zhang,
Hua Geng,
Tarunpreet Singh Virk, Yan Zhao,
Jiahui Tan,
Chong-an Di,
Wei Xu,
Kamaljit Singh,
Wenping Hu,
Zhigang Shuai,
Yunqi Liu,
Daoben Zhu
[show abstract]
[hide abstract]
ABSTRACT: An alternatively stacked donor-acceptor complex from solution is obtained. As a self-assembled "molecular level heterojunction", this crystal displays stable ambipolar transport behaviors in ambient atmosphere. The balance hole and electron transport properties are rationalized through theoretical considerations from band structure calculation, theoretical analysis on super-exchange effects in the intermolecular electronic couplings as well as molecular reorganization energy.
Advanced Materials 04/2012; 24(19):2603-7. · 13.88 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: Efficient field-effect mobilities measured from both p- and n-type organic monolayer field-effect transistors that utilize graphene electrodes permit quantitative analysis of the role of the first layer. Information about the relationship between the kinetics of the diffusion process and film morphology of the first layer during the increasing substrate temperature, and correlations of field-effect mobilities of the first monolayer and the substrate temperature is obtained.
Advanced Materials 02/2012; 24(11):1471-5. · 13.88 Impact Factor
-
Jun Li, Yan Zhao,
Huei Shuan Tan,
Yunlong Guo,
Chong-An Di,
Gui Yu,
Yunqi Liu,
Ming Lin,
Suo Hon Lim,
Yuhua Zhou,
Haibin Su,
Beng S Ong
[show abstract]
[hide abstract]
ABSTRACT: Microelectronic circuits/arrays produced via high-speed printing instead of traditional photolithographic processes offer an appealing approach to creating the long-sought after, low-cost, large-area flexible electronics. Foremost among critical enablers to propel this paradigm shift in manufacturing is a stable, solution-processable, high-performance semiconductor for printing functionally capable thin-film transistors - fundamental building blocks of microelectronics. We report herein the processing and optimisation of solution-processable polymer semiconductors for thin-film transistors, demonstrating very high field-effect mobility, high on/off ratio, and excellent shelf-life and operating stabilities under ambient conditions. Exceptionally high-gain inverters and functional ring oscillator devices on flexible substrates have been demonstrated. This optimised polymer semiconductor represents a significant progress in semiconductor development, dispelling prevalent skepticism surrounding practical usability of organic semiconductors for high-performance microelectronic devices, opening up application opportunities hitherto functionally or economically inaccessible with silicon technologies, and providing an excellent structural framework for fundamental studies of charge transport in organic systems.
Scientific Reports 01/2012; 2:754.
-
[show abstract]
[hide abstract]
ABSTRACT: Taking advantage of the "coffee-ring" effect, graphene electrodes with channel lengths as low as 1-2 micrometers are patterned by inkjet printing. Organic thin film transistors and complementary inverters are also fabricated using these graphene electrodes and show excellent performance.
Advanced Materials 12/2011; · 13.88 Impact Factor
-
Advanced Materials 06/2011; 23(21):2387. · 13.88 Impact Factor
-
Advanced Materials 05/2011; 23(28):3128-33. · 13.88 Impact Factor
-
Advanced Materials 03/2011; 23(21):2448-53. · 13.88 Impact Factor
-
Advanced Materials 02/2011; 23(8):1008. · 13.88 Impact Factor
-
Advanced Materials 02/2011; 23(8):1009-14. · 13.88 Impact Factor
-
Advanced Functional Materials 01/2011; 21(4):786 - 791. · 10.18 Impact Factor
-
Advanced Materials 08/2010; 22(32):3537-41. · 13.88 Impact Factor
