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Solution-processable (Pc′)Eu(Pc′)Eu[TP(OH)PP]/rGO bilayer heterojunction organic transistors with exceptional excellent ambipolar performance

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Abstract

For the purpose of fabricating next generation of microelectronics and photonics, the transistor that simultaneously provides high-efficiency charge transport and air-stable ambipolar performance becomes highly desired. In this paper, the bilayer heterojunction field-effect transistors, named as t-Pc-1/rGO (HFET-1) and t-Pc-2/rGO (HFET-2), are constructed for the first time by using a simple two-step solution-processing approach, in which the high conductive reduced graphene oxide (rGO) film as the sub-layer and the film of ambipolar sandwich mixed (phthalocyaninato)(porphyrinato) europium triple-deckers (Pc′)Eu(Pc′)Eu[TP(OH)PP] {Pc′ = Pc, [Pc(OPh)8]} (t-Pc-1, t-Pc-2) as the top layer, respectively. The resulting bilayer heterojunction devices exhibit significantly improved air-stable ambipolar performance with the carrier mobilities of ca. 107 to 108 fold higher than those of pristine triple-deckers, and the Ion/Ioff of 102 to 103 fold higher than that of the single-component rGO device. In particular, due to the heterojunction effect in an “accumulation mode”, the device HFET-2 shows the ultrahigh and balanced mobilities between hole, 30.9 cm2 V−1 s−1, and electron, 39.6 cm2 V−1 s−1, with the optimized ON/OFF ratio of 103 for both carriers, representing the best result for ambipolar OFET devices reported thus far.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 21631003 and 21771192), Major Program of Shandong Province Natural Science Foundation (ZR2017ZB0315), the Natural Science Foundation of Shandong Province (ZR2017MB006), Taishan Scholar program of Shandong Province (ts201712019) and Research Foundation from China University of Petroleum (East China, Y1510051), X. Li thanks Taishan Scholar program of Shandong Province for the financial support.

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Kong, X., Lu, G., Wang, X. et al. Solution-processable (Pc′)Eu(Pc′)Eu[TP(OH)PP]/rGO bilayer heterojunction organic transistors with exceptional excellent ambipolar performance. J Mater Sci: Mater Electron 30, 12437–12446 (2019). https://doi.org/10.1007/s10854-019-01603-7

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