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RISS 인기검색어
- 검색키워드
- 저자 : Scheideler, Olivia (검색결과 3 건)
- 무료
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Metal evaporation dependent charge injection in organic transistors
Xu, Y.,Liu, C.,Sun, H.,Balestra, F.,Ghibaudo, G.,Scheideler, W.,Noh, Y.Y. Elsevier Science 2014 ORGANIC ELECTRONICS Vol.15 No.8
To illuminate a long-term remaining issue on how contact metallization (metal and speed) affects charge injection, we investigated top-contact pentacene transistors using two categories of metals deposited at various rates. Differing from previous studies such as those devoted to morphological influences by microscopy, in this work we concentrated on their electrical characteristics in particular combining the low-frequency noise which provided a direct quantity of trap density and its evolution with respect to contact metal and deposition rate. It turns out that the transistors with noble metal (Au) suffer from metal-diffusion related charge trapping in the pentacene bulk close to the Au/pentacene interface, and this diffusion-limited injection is greatly tuned from bulk to interface by speeding Au deposition which leads to a Schottky-like injection due to the severe thermal damage to the upper pentacene layer. Applying a conventional contacting metal (Cu), however, Ohmic contacts with much fewer traps are always observed regardless of metallization speed. This is attributed to an ultra-thin interlayer of Cu<SUB>x</SUB>O that guarantees stable Ohmic injection by introducing gap states and protecting the pentacene film so that those transistors appear to be free from Cu metallization. Our results quantitatively show the limiting factors of charge injection for different metals and at various evaporation rates.
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Chung, Seungjun,Karim, Muhammed Ahosan Ul,Kwon, Hyuk-Jun,Scheideler, William,Subramanian, Vivek Institute of Electrical and Electronics Engineers 2017 Journal of microelectromechanical systems Vol. No.
<P>We report a high-speed inkjet-printed three-terminal microelectromechanical(MEM) relay with a doubleclamped beam that exploits the enhanced stiffness of the double-clamped structure to improve electrical performance. To minimize mechanical delay and pull-in voltage, the contact gap between the channel-beam and drain, and the stiffness of the beam and shape of the drain was carefully designed and optimized through a 3-D finite element simulation. The double-clamped beam prevents stiction-related failure between the channel-beam and drain despite the contact gap being only 370 nm for a > 500 mu m long beam. The resulting printed relay delivers a turn-ON delay of 8 mu s at a gate voltage of 10 V, a pull-in voltage of only 7.2 V, immeasurable off-leakage, excellent subthreshold swing, and a small hysteresis window of 2 V without any bending or collapsing of the beam. The device also shows reliable operation over 105 cycles while maintaining a high ON/OFF ratio of 108, and extremely low ON-state resistance</P>
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Phage-Based Structural Color Sensors and Their Pattern Recognition Sensing System
Lee, Ju Hun,Fan, Benson,Samdin, Tuan D.,Monteiro, David A.,Desai, Malav S.,Scheideler, Olivia,Jin, Hyo-Eon,Kim, Soyoun,Lee, Seung-Wuk American Chemical Society 2017 ACS NANO Vol.11 No.4
<P>The mammalian olfactory system provides great inspiration for the design of intelligent sensors. To this end, we have developed a bioinspired phage nanostructure-based color sensor array and a smartphonebased sensing network system. Using a M13 bacteriophage (phage) as a basic building block, we created structural color matrices that are composed of liquid-crystalline bundled nanofibers from self-assembled phages. The phages were engineered to express cross-responsive receptors on their major coat protein (pVIII), leading to rapid, detectable color changes upon exposure to various target chemicals, resulting in chemical- and concentration-dependent color fingerprints. Using these sensors, we have successfully detected 5-90% relative humidity with 0.2% sensitivity. In addition, after modification with aromatic receptors, we were able to distinguish between various structurally similar toxic chemicals including benzene, toluene, xylene, and aniline. Furthermore, we have developed a method of interpreting and disseminating results from these sensors using smartphones to establish a wireless system. Our phage-based sensor system has the potential to be very useful in improving national security and monitoring the environment and human health.</P>
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