Charge transport and morphology of pentacene films confined in nano-patterned region

Abstract

The transport and morphology of macroscopic organic transistors have been thoroughly explained. However, the relationship between charge transport and the morphology of organic semiconductors in nano-confined regions is not well understood, which is required to design high-performance nano-electronics. Therefore, in this study, the electrical performance of pentacene thin-film transistors (TFTs) fabricated on nano-scale confined geometries was compared with that of other TFT systems fabricated on micro-scale confined or flat dielectrics. The results showed that the photoresist (PR) reliefs patterned onto silicon dioxide (SiO 2 ) dielectrics could control the growth mode of pentacene in the confined regions. As the line spacing between the PR patterns decreased to below the average size of pentacene normally grown on SiO 2 dielectrics (B1.7 lm), field-effect mobility (l FET ) of pentacene TFTs improved considerably. Specifically, the l FET values for the 250 nm patterned dielectric system were as high as 0.33 cm 2 V À1 s À1 , which was greater than those of the wider-patterned PR or flat dielectric systems (p 0.15 cm 2 V À1 s À1 ). These findings were related to the enhancement of charge-carrier transport owing to the anisotropic p-conjugated crystals nucleated from the nano-confined edges, providing important information that can be used in the design of high-performance nano-scale organic electronics.

Thermo photo-electrochemical effect in n-InP/aqueous solution of orange dye/C cell

“…Organic semiconductor based electronic devices have developed a greater interest and are being used over the last few decades. [23] A number of organic semiconductor based electronic and optoelectronic devices have been studied including sensors [24] The effect of light and heat is studied on the electrical properties of an electrochemical n-InP/aqueous solution of orange dye/C cell. The cell is investigated under the light and heat of filament bulb.…”

3D Dewetting for Crystal Patterning: Toward Regular Single‐Crystalline Belt Arrays and Their Functionality

“…In this case, regular, organic, single-crystalline 1D microstructures can be generated accordingly, showing the potential as the building blocks in microscaled organic electronics. To ensure the successfully selective modifi cation of FAS upon the pillar tops, in-site Organic single-crystalline semiconductors have designable molecular structures and packing modes, thus exhibiting promising electronic/optical applications in fi eld-effect transistors, [1][2][3][4][5][6] sensors, [ 7,8 ] light-emitting diodes, [ 9 ] and photovoltaic devices. A line-pillar-structured template with regionally different wettabilities (hydrophobicity on pillar tops while superhydrophilicity on pillar sidewalls), has been used to split organic liquid into regular liquid stripes, and guide the unidirectional dewetting process of each liquid strip.…”

“…The tops and sidewalls of linear silicon micropillars were hydrophilic at the beginning. To ensure the successfully selective modifi cation of FAS upon the pillar tops, in-site Organic single-crystalline semiconductors have designable molecular structures and packing modes, thus exhibiting promising electronic/optical applications in fi eld-effect transistors, [1][2][3][4][5][6] sensors, [ 7,8 ] light-emitting diodes, [ 9 ] and photovoltaic devices. After contacting for ≈3 min, the PDMS fi lm has been carefully peeled off, leaving FAS molecules upon the pillar tops.…”

Transparent Flexible Nanoline Field-Effect Transistor Array with High Integration in a Large Area

“…The step height of each terrace was ∼1.5 nm. The exclusive XRD peaks and the consistent terrace height indicate that the pentacene molecules are oriented in an edge-on configuration with long molecular axis aligned perpendicular to the substrate. , The pentacene grains had an average size of ∼150 nm, which is smaller than the typical pentacene grains reported in literature (∼1.7 μm). , These nanosized pentacene grains have been attributed to the confined geometry of the photoresist trench − and the surface energies of the PMMA and the photoresist. , …”