Study of Charge Transport in Conducting Polymer between Nanoelectrodes
碩士 === 國立清華大學 === 材料科學工程學系 === 93 === We successfully fabricate gold nanoelectrodes with controllable dimensions by a combination of lift-off process and atomic force microscopy nanolithography. By making use of these nanoelectrodes, we study the hole transport in the conducting polymer MEH-PPV. It...
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| Format: | Others |
| Language: | zh-TW |
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2005
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| Online Access: | http://ndltd.ncl.edu.tw/handle/07277993757312253863 |
| Summary: | 碩士 === 國立清華大學 === 材料科學工程學系 === 93 === We successfully fabricate gold nanoelectrodes with controllable dimensions by a combination of lift-off process and atomic force microscopy nanolithography. By making use of these nanoelectrodes, we study the hole transport in the conducting polymer MEH-PPV. It is found that dilute samples (1.5 mg/l) reveal space-charge-limited conduction, and a hole mobility obtained at a gap of 70 nm is as high as 1 cm2/Vs at a field of 9×105 V/cm. This value is comparable to the hole mobility of single MEH-PPV chains. Furthermore, we also observe mobility enhancement as the gap is reduced. On the other hand, high-concentration samples (1.5 mg/ml) present even better electrical properties and obey the Ohm’s law. We find amazing conductivities calculated to be around 10 S/cm. The unprecedented electrical behavior observed in the present study is believed to be due to combined effects of chain alignment along the substrate and nanoscale gaps.
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