کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1264570 | 972153 | 2012 | 7 صفحه PDF | دانلود رایگان |
Complementary thin-film transistor circuits composed of 6,13-bis(triisopropyl-silylethynyl) pentacene (TIPS–PEN) and a rylene carboxylic diimide derivative for p- and n-channel thin-film transistors (TFTs) were fabricated on flexible foils. The so-called staggered TFT configuration is used, meaning that the semiconductors layers are deposited last. The work-function of the injecting gold electrodes were modified using several self-assembled monolayers (SAMs). For optimized contacts the mobility of the n- and p-channel TFTs was 0.5 cm2/Vs and 0.2 cm2/Vs, respectively. Strongly degraded performance is obtained when the n-channel material was printed on contacts optimized for the p-channel TFT, and vice versa. This illustrates that for CMOS circuits we need careful work-function engineering to allow proper injection for both electrons and holes. We show for the first time that by using a bimolecular mixture for the SAM we can systematically vary the work function, and demonstrate how this affects the performance of discrete n-type and p-type transistors, as well as CMOS inverters and ring oscillators. Under optimal processing conditions we realized complementary 19-stage ring oscillators with 10 μs stage delay operating at 20 V.
Figure optionsDownload as PowerPoint slideHighlights
► We ink-jet printed complementary thin-film transistor circuits on flexible foils.
► High mobility soluble rylene diimide and pentacene derivatives were used.
► Work function of injecting contacts was varied for optimal CMOS performance.
► Complementary 19-stage ring oscillators with 10 μs stage delays were realized.
► Circuits were analyzed in the framework of the energy delay product.
Journal: Organic Electronics - Volume 13, Issue 9, September 2012, Pages 1686–1692