SiPc-based OTFTs! New Publication in J. Mater. Chem C!
Silicon Phthalocyanines as N-Type Semiconductors in Organic Thin Film Transistors
Silicon phthalocyanines (SiPcs) represent a large class of molecules that have been studied as donors, acceptors and ternary additives in organic photovoltaics but not in organic thin-film transistors (OTFTs). We synthesized three novel SiPcs using axial substitution and examined their performance as the active layer in bottom-gate bottom-contact (BGBC) OTFTs. All three molecules exhibit N-type behaviour, with the dibenzoate substituted SiPc showing the greatest field-effect mobility of roughly 6 x 10-4 cm2 V-1 s-1 in vacuum. This performance improved to >0.01 cm2 V-1 s-1 when using a combination of dielectric modification with octadecyltrichlorosilane (ODTS) and a substrate temperature during deposition of 200 °C. These promising results point towards the possibility of high performance N-type SiPcs by exploring the wealth of available options in axial and peripheral substitution and careful process control during fabrication.
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