Ion-scattering analysis of self-assembled monolayers of silanes on organic semiconductors

Threshold Voltage Control in Organic Field-Effect Transistors by Surface Doping with a Fluorinated Alkylsilane

“…Furthermore, it was shown in other works that nearly no chlorine species remained in the doped substrates. 30,49 Regarding the second point raised above, the binding and formation of an alkylsilane SAM requires oxygen sites, either in the form of defects on organic semiconductors like rubrene 29,44,49 or surface oxides as in the case of Si. 19,20 However, TIPS-pentacene is not easily oxidized due to the passivation of the 6, 13 position with the TIPS groups.…”

“…This result shows that the released HCl is not the active doping species. Furthermore, it was shown in other works that nearly no chlorine species remained in the doped substrates. , …”

“…Regarding the second point raised above, the binding and formation of an alkylsilane SAM requires oxygen sites, either in the form of defects on organic semiconductors like rubrene ,, or surface oxides as in the case of Si. , However, TIPS-pentacene is not easily oxidized due to the passivation of the 6, 13 position with the TIPS groups. , Still, the highly reactive FTCS molecules can undergo self-polymerization, which could stabilize the dopant molecules on the TIPS-pentacene film. The missing bonding sites can be one explanation that the formation of a SAM could not be detected.…”

Surface modification and shape adjustment of polymer semiconductor nanowires

“…It was reported that alkylsilanes such as FTS, octyltrichlorosilane, and (aminopropyl)triethoxysilane can form SAMs on the film surface of organic materials including single crystal organic semiconductors, conjugated polymers, and poly(ethylene terephthalate) by means of chemical bonds. [61][62][63][64] To validate the existence of alkylsilanes in the P3HT nano-structured films, IR transmission spectra of these films were measured. Unfortunately, we didn't observe any difference in the spectra between the pure P3HT NWs and the alkylsilane treated ones.…”

“…This binding process is similar to the way FTS molecules bind to the surface of rubrene single crystal and P3HT film reported by others. 61,63 Since APS has a hydrophilic -NH 2 group at the chain end, water molecules from the air can thus be introduced into the hydrophobic P3HT p-xylene solution and immobilized by the amino group. In addition, the catalytic activity of basic amino groups will be beneficial to the hydrolysis of the trimethoxysilyl group in APS as the hydrolysis process usually needs a basic/acidic catalyst.…”