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Title: | Lanthanide complexes as molecular dopants for realizing air-stable n-type graphene logic inverters with symmetric transconductance |
Authors: | Rao, V. Ramgopal |
Keywords: | EEE Transconductance Graphene field-effect transistor (GFET) Electronic devices |
Issue Date: | 2019 |
Publisher: | RSC |
Abstract: | An unprecedented air-stable, n-doped graphene field-effect transistor (GFET) with exceptionally enhanced mobility (500%), and concomitantly increased current density (∼105 A cm−2), using lanthanide macrocyclic complexes [Ln(L1)(NO3)3] (where Ln = La (1) or Ce (2)) is demonstrated. Such n-doped GFETs (n-GFETs) exhibit ambient stability for up to 7200 h, attributed to the inherent robustness of 1 and 2. Achieving stable and symmetric n-GFETs is mutually exclusive and elusive, underlining the significance of both high stability and symmetric electron- and hole-currents illustrated here. Interestingly, the influence of C–H⋯π interaction for the non-covalent charge-transfer between the dopant and GFET is established experimentally for the first time and strongly corroborated through computational investigations. Besides stabilizing n-doped GFETs, the C–H⋯π interaction unravels a previously unknown direction for electronic tuning of graphene. Importantly, spatial selectivity is achieved through sub-monolayer coverage (0.5–3.0 molecules per μm2) of the dopants using the femtojet dispensing route. This approach is synergistically combined with the air-stability of n-GFETs to realise complementary, bottom-gated logic inverters exhibiting the highest gain of 0.275 (at 2 V) and lowest power dissipation (∼30 μW), to realise next-generation molecular electronic devices. |
URI: | https://pubs.rsc.org/en/content/articlelanding/2019/mh/c8mh01241e http://dspace.bits-pilani.ac.in:8080/xmlui/handle/123456789/12574 |
Appears in Collections: | Department of Electrical and Electronics Engineering |
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