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. 2017 Oct 17;8:999. doi: 10.1038/s41467-017-01047-9

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Carrier injection performance of conventional and novel electrodes. a A field-effect transistor (FET) with Au and Ca electrodes for holes and electrons injection, respectively. b A FET with the new electrodes Au/pc-OSC/TTC both for electrons and holes. Carrier injection performance for sc-BP2T FET with hetero electrodes; c Au for holes and Ca for electrons (blue circles) vs. Au/pc-BP2T/TTC for holes and Ca/pc-BP2T/TTC for electrons (red circles), d Au for electrons and Ca for holes (blue circles) vs. Au/pc-BP2T/TTC for electrons and Ca/pc-BP2T/TTC for holes (red circles), e Au for holes and Ca for electrons (blue circles) vs. Au/pc-BP2T/TTC for both holes and electrons (red circles). f Surface morphology of sc-RU, pc-RU/sc-RU, TTC/sc-RU, and pc-RU/TTC/sc-RU, respectively, measured with an atomic force microscope