Towards Development and Characterization of Ionic Junction via Microcontact Printing
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Towards Development and Characterization of Ionic Junction via Microcontact Printing Yamini Yadav, and Shalini Prasad Electrical Deparment, Portland State University, P. O. Box 751, Portland, OR, 97207 ABSTRACT The paper presents an evaluation of the feasibility of developing ionic surfactant coated single walled carbon nanotube (SWCNTs) (P-N) junction clusters via microcontact printing using intrinsic semi conducting SWCNTs. These SWCNTs are doped with anionic and cationic surfactant molecules respectively, thereby altering the Fermi energy levels of and its electrical properties. Two types of surfactants were used for doping the SWCNTs to develop extrinsically doped P and N type SWCNTs. Sodium dodecyl sulfate (SDS) having Na+ positive ionic charge (anions) and Cetyl trimethylammonium bromide (CTAB), having Br- negative ionic charge (cations) on its hydrophilic ends have been used to generate anionic SWCNTs (P type) and cationic SWCNTs( N- type respectively. Using, dual level patterning process, these extrinsically doped anionic and cationic semiconducting SWCNTs clusters are alternatively symmetrically patterned in a parallel array to form crossbar P-N junctions onto a standard microfabricated platform using flexible polymeric poly-dimethylsiloxane (PDMS) stamps. Ink-based transfer of the nanomaterial from the relief structures achieves parallel alignment of SWCNTs clusters. The electrical device characterization is achieved by measuring I-V characteristics from the base micro fabricated platform. Functionality of the nanodevice is demonstrated by studying the rectifying current – voltage (IV) characteristics that shows promise towards the formation of a junction diode array, which can be used for integrating complex logic devices for high-end applications such as memory module and addressable logic. Lastly, we believe that the chemical modulation method and microcontact printing techniques will have a wide scope for development of nanomaterial-based devices.
INTRODUCTION Over past few years, word ‘organic’ has gained the attention of many researchers. Organic nanomaterials are being used for multiple reasons, primarily as individuals are getting aware of health and environmental safety; they are using organic resources in day-to-day life[1]. Therefore, scientists are using organic nanomaterial for building various nanodevices based on the concept of recycling. Secondly, in semiconductor world, there are a wide variety of applications in visual rollable displays [2]. Commercialization of these rollable displays has modern sophisticated application towards multiple electronic and multimedia applications such as electronic books [3], microemission displays and organic light-emitting diode screens [4]. Finally, it has been well-establish fact that use of organic nanomaterial has improved the device performance capabilities. Therefore integrating organic nanomaterial in the semiconducting world has wide applications in medical, industrial and defense application. In the current state-of-art technology, p
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