We demonstrate n-type organic thin film transistors (OTFTs) employing copper hexadecafluorophthalocyanine (CuPcF16 ) as the active layer and para-hexaphenyl (p-6p) as the inducing layer.Compared with the CuPcF16-based OTFTs without the p-6p inducing layer,the performance of the CuPcF16 /p-6p OTFTs is greatly improved.The charge carrier field-effect mobility μ,on-off current ratio Ion/ Ioff and threshold voltage VT of the CuPcF16/p-6p OTFTs are 0.07cm2/V·s,1.61 × 105 and 6.28 V,respectively,approaching the level of a single crystal device.The improved performance is attributed to the introduction of p-6p to form a highly oriented and continuous film of CuPcF16 with the molecular π-π stack direction parallel to the substrate.Organic thin film transistors have received a wide interest because of their potential applications in displays,logic circuits,sensors and lightemitting devices.[1-4] Although the performance of p-type pentacene-based organic thin film transistors (OTFTs) has reached the α-Si level,[5] the mobility of n-channel OTFTs with air stability is still relatively low.Fluorinated copper phthalocyanine (CuPcF16) is one of a few air-stable n-type organic semiconductors with a low electron field-effect mobility.To improve the performance of CuPcF16-based OTFTs,Yan et al.[5] employed an organic heterojunction buffer layer to decrease the contact resistance of organic/metal.