A reduced complexity process for organic thin film transistors

Abstract

A simplified device structure for depletion-mode organic thin film transistors is described in which the gate electrode and the source/drain contacts are prepared in the same process step, thus reducing the number of material depositions and photolithography steps. Based on the simplified device structure and using the small-molecule aromatic hydrocarbon pentacene as the active material, organic thin film transistors were fabricated on glass substrates with carrier mobility of 0.6 cm2/V s, on/off current ratio of 105, and subthreshold slope of 0.5 V/decade.

Modeling of organic thin film field-effect transistors based on pentacene in saturation regime: Effect of light illumination

“…In recent years organic semiconductors have been extensively studied for various applications in ubiquitous low cost electronics such as solar cells, sensors [4][5][6], light-emitting diodes, and organic thin-film transistors (OTFTs) [7,8]. In particular, pentacene is a semiconducting organic material, which attracts the interests of scientists and engineers and it has been used as the channel of organic thin film transistors (OTFTs) [9][10][11][12][13][14][15]. It exhibits a considerably high fieldeffect mobility of more than 1 cm 2 /Vs [15][16][17][18][19][20][21][22][23][24].…”

“…In particular, pentacene is a semiconducting organic material, which attracts the interests of scientists and engineers and it has been used as the channel of organic thin film transistors (OTFTs) [9][10][11][12][13][14][15]. It exhibits a considerably high fieldeffect mobility of more than 1 cm 2 /Vs [15][16][17][18][19][20][21][22][23][24]. Gate-voltage dependent mobility is now a well-recognized feature in organic thin-film transistors (OFETs) [25][26][27][28].…”

Lithography‐Free Microfabrication of Electrode Arrays with 2 μm Electrode Gaps Using Topographic Templates

“…[ 21 ] Conformal Parylene-C polymer masks produce minimum channel length as small as 4 µm. [ 22 ] Other sophisticated processes include photolithography, [ 23,24 ] inkjet printing, [ 25,26 ] soft lithography [ 27,28 ] and Target substrates composed of other materials could also be used because this generalizable process uses TRT. [42][43][44][45] PVA fi lms transferred onto the target substrate contain microstructures with short-range order (Figure 1 b-iii).…”

Enhancement of Interconnectivity in the Channels of Pentacene Thin‐Film Transistors and Its Effect on Field‐Effect Mobility

“…[1][2][3][4] The interest in pentacene films, which exhibit p-type transport, primarily stems from their relatively high mobilities and high on/off current ratios in OTFTs. [5] In order to obtain good OTFT performance, it is crucial to understand carrier transport in the channel regions of semiconductors.…”