In integrated circuits(ICs),the parasitic capacitance is one of the crucial factors that degrade the circuit dynamic performance;for instance,it reduces the operating frequency of the circuit.Eliminating the parasitic...In integrated circuits(ICs),the parasitic capacitance is one of the crucial factors that degrade the circuit dynamic performance;for instance,it reduces the operating frequency of the circuit.Eliminating the parasitic capacitance in organic transistors is notoriously challenging due to the inherent tradeoff between manufacturing costs and interlayer alignment accuracy.Here,we overcome such a limitation using a cost-effective method for fabricating organic thin-film transistors and rectifying diodes without redundant electrode overlaps.This is achieved by placing all electrodes horizontally and introducing sub-100nm gaps for separation.A representative small-scale IC consisting of five-stage ring oscillators based on the obtained nonparasitic transistors and diodes is fabricated on flexible substrates,which performs reliably at a low driving voltage of 1V.Notably,the oscillator exhibits signal propagation delays of 5.8μs per stage at a supply voltage of 20V when utilizing pentacene as the active layer.Since parasitic capacitance has been a common challenge for all types of thin-film transistors,our approach may pave the way toward the realization of flexible and large-area ICs based on other emerging and highly performing semiconductors.展开更多
基金Fundamental Research Funds for the Central Universities in China,Grant/Award Number:14380273The National Key R&D Program of China,Grant/Award Number:2021YFA0717900National Natural Science Foundation of China,Grant/Award Numbers:21875100,62174083。
文摘In integrated circuits(ICs),the parasitic capacitance is one of the crucial factors that degrade the circuit dynamic performance;for instance,it reduces the operating frequency of the circuit.Eliminating the parasitic capacitance in organic transistors is notoriously challenging due to the inherent tradeoff between manufacturing costs and interlayer alignment accuracy.Here,we overcome such a limitation using a cost-effective method for fabricating organic thin-film transistors and rectifying diodes without redundant electrode overlaps.This is achieved by placing all electrodes horizontally and introducing sub-100nm gaps for separation.A representative small-scale IC consisting of five-stage ring oscillators based on the obtained nonparasitic transistors and diodes is fabricated on flexible substrates,which performs reliably at a low driving voltage of 1V.Notably,the oscillator exhibits signal propagation delays of 5.8μs per stage at a supply voltage of 20V when utilizing pentacene as the active layer.Since parasitic capacitance has been a common challenge for all types of thin-film transistors,our approach may pave the way toward the realization of flexible and large-area ICs based on other emerging and highly performing semiconductors.
