Upcoming Events

I will discuss on new finding on a peculiar structure called PCBM nanoribbons and PCBM nanosheets. I will particularly present the self-assembly of semicrystalline [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) nanosheets at the interface between a hydrophobic solvent and water, and show how we utilize this opportunity for the realization of electronically active organic/ organic molecular heterostructures. The self-assembled PCBM nanosheets can feature a lateral size of >1 cm2 and be transferred from the water surface to both hydrophobic and hydrophilic surfaces using facile transfer techniques. We employ a transferred single PCBM nanosheet as the active material in a field-effect transistor (FET) and verify semiconductor function by a measured electron mobility of 1.2 × 10⁻² cm² V⁻¹ s⁻¹ and an on−off ratio of ∼1 × 10⁴. We further fabricate a planar organic/organic heterostructure with the p-type organic semiconductor poly(3-hexylthiophene-2,5-diyl) as the bottom layer and the n-type PCBM nanosheet as the top layer and demonstrate ambipolar FET operation with an electron mobility of 8.7 × 10⁻⁴ cm² V⁻¹ s⁻¹ and a hole mobility of 3.1 × 10⁻⁴ cm2 V⁻¹ s⁻¹.