Topic
Quantum capacitance
About: Quantum capacitance is a research topic. Over the lifetime, 954 publications have been published within this topic receiving 24165 citations.
Papers published on a yearly basis
Papers
More filters
Abstract: We demonstrate a considerable suppression of the low-field leakage through a Y2O3 topgate insulator on graphene by applying high-pressure O2 at 100 atm during post-deposition annealing (HP-PDA). Consequently, the quantum capacitance measurement for the monolayer graphene reveals the largest Fermi energy modulation (EF = ~0.52 eV, i.e., the carrier density of ~2*10^13 cm^-2) in the solid-state topgate insulators reported so far. HP-PDA is the robust method to improve the electrical quality of high-k insulators on graphene.
22 citations
TL;DR: In this article, an analytical model of intrinsic carbon-nanotube field effect transistors is presented, where the origins of the channel carriers are analyzed in the ballistic limit and a noniterative surface-potential model is developed based on an analytical electrostatic model and a piecewise constant quantum-capacitance model.
Abstract: In this paper, an analytical model of intrinsic carbon-nanotube field-effect transistors is presented. The origins of the channel carriers are analyzed in the ballistic limit. A noniterative surface-potential model is developed based on an analytical electrostatic model and a piecewise constant quantum-capacitance model. The model is computationally efficient with no iteration or numerical integration involved, thus facilitating fast circuit simulation and system optimization. Essential physics such as drain-induced barrier lowering and quantum capacitance are captured with reasonable accuracy.
21 citations
TL;DR: In this article, a photoconductive antenna (PCA) is designed using spatially dispersive graphene strips (GSs) with parallel-plate configuration, and a nonlocal per unit length circuit model is employed to study wave propagation in the GPCA.
Abstract: In this paper, a photoconductive antenna (PCA) is designed using spatially dispersive graphene strips (GSs) with parallel-plate configuration. This configuration maintains the properties of a single GS and at the same time provides more tunability for designing a graphene-based PCA (GPCA). When a GS is surrounded by a high-index media, propagating wave vector along the structure becomes spatially dispersive, because the group velocity of the propagating wave is greatly reduced and it becomes comparable to Fermi velocity in graphene. In this situation, it is necessary to use a nonlocal conductivity model for graphene. In this paper, a nonlocal per unit length circuit model is employed to study wave propagation in the GPCA. In the circuit model, the nonlocal behavior will be modeled via a per unit length quantum capacitance that under certain conditions it is simplified to quantum capacitance in graphene. In deep subwavelength regime, due to strong coupling between GSs in the the double stacked configuration, it can be replaced by a single GS that its conductivity is two times greater than the former case. Finally, the GPCA is fed by a wide-band photocurrent in order to terahertz radiation and detection are investigated.
21 citations
TL;DR: The main emphasis is on electronic components, particularly transistors and radio-frequency applications, and a circuit theory model is used to predict the feasibility of CNT transmission lines and technical challenges that have to be solved before graphene transistors are suitable for mobile devices.
Abstract: This paper presents potential carbon nanoelectronic applications in battery-powered mobile devices such as mobile phones and laptop computers. Based on the physical behavior of carbon nanotubes (CNTs) and graphene and the specific requirements for portable consumer electronic devices, the main challenges and restrictions for the adoption of carbon-based components by the industry are presented. The main emphasis is on electronic components, particularly transistors and radio-frequency applications. A circuit theory model is used to predict the feasibility of CNT transmission lines, and technical challenges that have to be solved before graphene transistors are suitable for mobile devices are presented. The performance of graphene transistors is compared with the corresponding parameters of silicon. In addition, other potential carbon-based applications in mobile devices aside from transistors such as displays and memory elements are outlined briefly.
21 citations
TL;DR: In this paper, a measurement on quantum capacitance of individual semiconducting and small band gap SWNTs was performed and a strong electron correlation in SWNT was found. But this correlation was not considered in the measurement of individual SWNT.
Abstract: We report a measurement on quantum capacitance of individual semiconducting and small band gap SWNTs. The observed quantum capacitance is remarkably smaller than that originating from density of states and it implies a strong electron correlation in SWNTs.
21 citations