Fabrication of Organic Field Effect Transistor by Directly Grown Poly(3 Hexylthiophene) Crystalline Nanowires on Carbon Nanotube Aligned Array Electrode

Abstract

We fabricated organic field effect transistors (OFETs) by directly growing poly (3-hexylthiophne) (P3HT) crystalline nanowires on solution processed aligned array single walled carbon nanotubes (SWNT) interdigitated electrodes by exploiting strong π-π interaction for both efficient charge injection and transport. We also compared the device properties of OFETs using SWNT electrodes with control OFETs of P3HT nanowires deposited on gold electrodes. Electron transport measurements on 28 devices showed that, compared to the OFETs with gold electrodes, the OFETs with SWNT electrodes have better mobility and better current on-off ratio with a maximum of 0.13 cm(2)/(V s) and 3.1 × 10(5), respectively. The improved device characteristics with SWNT electrodes were also demonstrated by the improved charge injection and the absence of short channel effect, which was dominant in gold electrode OFETs. The enhancement of the device performance can be attributed to the improved interfacial contact between SWNT electrodes and the crystalline P3HT nanowires as well as the improved morphology of P3HT due to one-dimensional crystalline nanowire structure.

Self‐Assembly of Functional Molecules into 1D Crystalline Nanostructures

“…Cho and co‐workers reported the preparation and property investigation of high‐quality, 1D single‐crystal self‐organized poly(3‐hexylthiophene) (P3HT) microwires grown by a facile self‐assembly process in dilute solution . P3HT crystalline nanowires were also fabricated on aligned SWNT array interdigitated electrodes through a solution self‐assemble process by Zhai and co‐workers . Other regioregular poly(3‐alkylthiophene)s such as P3BT, P3PT, and a copolymer of P3PT/P3OT were also reported to self‐assemble into crystalline nanowires with a diameter of 13–16 nm by Jenekhe and co‐workers .…”

Semiconducting Enriched Carbon Nanotube Aligned Arrays of Tunable Density and Their Electrical Transport Properties

“…The degree of alignment and the density of SWNT in the array are expected to have a great influence on device performance [3][4][5][6][7][8][9][10][11][12][13]. For these reasons, there is a significant research effort to fabricate devices with massively parallel arrays of SWNTs for field effect transistors (FETs) [3][4][5][6][7], RF applications [9,10,14], plastic electronics [15,16], display technologies [17], electrodes [18,19]. and sensors [20].The align array of SWNTs have been achieved using either direct growth via chemical vapor deposition (CVD) [5,9,10,21,22] or post growth from solution processed assembly techniques [3,4,[17][18][19][23][24][25][26].…”

Organic Semiconductor and Transistor Electrical Characteristic Based on Carbon Nanotubes

“…Recently, fabrication of OFETs using the CNT electrodes has been reported by several research groups [10][11][12][13][14][15][16][17][18]. In these reports, the CNT electrodes were fabricated with various techniques using either individual CNT [10,11], random network CNTs [15][16][17] CNT/polymer composite [12] or aligned array CNTs [13,14,18].…”

“…In these reports, the CNT electrodes were fabricated with various techniques using either individual CNT [10,11], random network CNTs [15][16][17] CNT/polymer composite [12] or aligned array CNTs [13,14,18]. However, an important question remains unanswered: whether the density of CNT in the electrode has any role in the performance of the fabricated OFETs and how much improvement can be achieved using CNT electrode?…”