Frontiers of Engineering Reports on Leading-Edge Engineering from the 2008 Symposium (2009) / Chapter Skim
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Roll Printing of Crystalline Nanowires for Integrated Electronic and Sensor Arrays--Ali Javey, Zhiyong Fan, Johnny C. Ho, and Roie Yerushalmi
Roll Printing of Crystalline Nanowires for Integrated Electronic and Sensor Arrays--Ali Javey, Zhiyong Fan, Johnny C. Ho, and Roie Yerushalmi
Pages 59-70
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From page 59... ...
However, the short lifetimes and low carrier mobility of these materials, as compared to crystalline inorganic semiconductors, have been major obstacles to applications that require high speed, low power, and long lasting electronics (Reuss et al., 2005; Service, 2000; Someya and Sakurai, 2003)
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From page 60... ...
. In this paper, we review recent advances in the assembly and integration of NW arrays on foreign substrates that can be integrated into electronic devices and sensors.
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From page 61... ...
, and (2) patterned transfer of NWs directly from the roller to a receiver substrate via differential roll printing, as illustrated in Figure 1.
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From page 62... ...
This is consistent with the hypothesis that, as randomly aligned NWs on the growth substrates are dragged across the surface of the receiver substrate, they become aligned by mechanical combing. Once the NWs are anchored by van der Waals forces, they are detached from the growth substrate and transferred to the receiver substrate.
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From page 63... ...
functional NWs on substrates and may point the way toward the realization of high-performance, flexible electronics based on printed, single-crystalline, highmobility nanoengineered materials. Notably, the printed NW arrays are highly aligned in the direction of rolling and are limited to a monolayer (Figure 3)
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From page 64... ...
. The printed NWs are ~30 nm in diameter.
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From page 65... ...
. The observed linear dependence of the on-current on the device width illustrates the uniformity and reproducibility of NW printing tech FIGURE 4 Devices based on printed NW arrays.
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From page 66... ...
The fabrication of heterogeneous NW circuits involves two-step printing of heterostructured Ge/Si and CdSe NWs at predefined locations on substrates, followed by device and circuit fabrication using conventional microfabrication processing. As a proof of concept of the feasibility of using NW printing technology for heterogeneous circuitry, we fabricated Ge/Si NW amplifiers and CdSe photo detectors that are integrated on-chip on Si substrates (Figure 5)
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From page 67... ...
(A) Circuit diagram for the all-NW photo detector, with high mobility Ge/Si NW FETs (T1 and T2)
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From page 68... ...
This work not only demonstrates NW device integration at an unprecedented scale, but also presents a novel system based on printed NW arrays that may have a number of technological applications with NWs as building blocks. Conclusion Significant progress has been made in the roll printing of NWs for highly ordered assembly of crystalline semiconductors on foreign substrates with high uniformity, regularity, and tunable density.
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From page 69... ...
2001. Logic gates and computa tion from assembled nanowire building blocks.
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