With contributions from top international experts from both industry and academia, Nano-Semiconductors: Devices and Technology is a must-read for anyone with a serious interest in future nanofabrication technologies.
Taking into account the semiconductor industry's transition from standard CMOS silicon to novel device structuresâincluding carbon nanotubes (CNT), graphene, quantum dots, and III-V materialsâthis book addresses the state of the art in nano devices for electronics. It provides an all-encompassing, one-stop resource on the materials and device structures involved in the evolution from micro- to nanoelectronics.
The book is divided into three parts that address:
Semiconductor materials (i.e., carbon nanotubes, memristors, and spin organic devices)
Silicon devices and technology (i.e., BiCMOS, SOI, various 3D integration and RAM technologies, and solar cells)
Compound semiconductor devices and technology
This reference explores the groundbreaking opportunities in emerging materials that will take system performance beyond the capabilities of traditional CMOS-based microelectronics. Contributors cover topics ranging from electrical propagation on CNT to GaN HEMTs technology and applications. Approaching the trillion-dollar nanotech industry from the perspective of real market needs and the repercussions of technological barriers, this resource provides vital information about elemental device architecture alternatives that will lead to massive strides in future development.
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1 Electrical Propagation on Carbon Nanotubes From Electrodynamics to Circuit Models
Antonio Maffucci, Andrea G. Chiariello, Carlo Forestiere, and Giovanni Miano
CONTENTS
1.1Introduction
1.2Electrodynamics of CNTs
1.2.1Generality
1.2.2Band Structure of a CNT Shell
1.2.3Constitutive Relation for a CNT Shell
1.2.4Number of Effective Channels for SWCNTs and MWCNTs
1.3An Electromagnetic Application: CNTs as Innovative Scattering Materials
1.3.1Generality
1.3.2Electromagnetic Models for CNT Scattering
1.4Circuital Application: CNTs as Innovative Interconnects
1.4.1CNTs in Nanointerconnects
1.4.2TL Model for a CNT Interconnect
1.4.3A Bundle of CNTs as Innovative Chip-to-Package Interconnects
1.5Conclusions
References
1.1 INTRODUCTION
Carbon nanotubes (CNTs) are recently discovered materials [1] made by rolled sheets of graphene of diameters on the order of nanometers and lengths up to millimeters (Figures 1.1 and 1.2). Because of their outstanding electrical, thermal, and mechanical properties [2,3], CNTs have been proposed as emerging materials offering solutions to many of the problems presented by the strict requirements of technology nodes below 22 nm [4,5]. At present, CNTs are considered for a large variety of micro- and nanoelectronics applications, such as nanointerconnects [6â8], nanopackages [9], nanotransistors [10], nanopassives [11], and nanoantennas [12], [13]. Recently, theoretical predictions have been confirmed by the first real-world CNT-based electronic devices, such as the CNT bumps for nanopackaging applications reported by Soga et al. [14] or the CNT wiring of a prototype of digital integrated circuit, one of the first examples of successful CNT-CMOS (complementary metalâoxideâsemiconductor) integration [15].
Given these perspectives, many attempts have been made to derive models describing the electrical propagation along CNTs. The electromagnetic response of CNTs has been widely examined in frequency ranges from microwave to the visible, properly taking into account the graphene crystalline [16,17]. For each carbon atom in the grapheme, only one out of four valence electrons (the Ï electron) contributes to the conduction phenomenon; thus, in order to model the electromagnetic response of CNTs, there is the need to describe the interaction of the Ï electrons with the electromagnetic fields produced by the Ï electrons themselves and by the external sources, under the action of the electric field generated by the fixed positive ions of the lattice. This requires, in principle, a quantum mechanical approach, since the electrical behavior of Ï electrons strongly depends on the interaction with the positive ion lattice. A quantum mechanical approach has been used, for instance, in the study of Miyamoto et al. [18], where the model is derived by using numerical simulations based on first principles. Alternatively, phenomenological approaches are possible, such as those proposed by Burke [19,20], based on the Luttinger liquid theory. Another possible option is given by semiclassical approaches, based on simplified models that yield approximated, but analytically tractable, results. Examples are given in Wesströmâs report [21], where the CNT is modeled as an electron waveguide, or in Salahuddin et al.âs study [22], where a general model for a quantum wire is derived from the transport theory based on the Boltzmann equation.
Among these models, the fluid ones play a central role in CNT modeling; in fact, despite their simplicity and immediate physical intuition, they are able to describe the main physical processes arising on characteristic lengths involving many unit cells, such as the collective effects. These models assume that the electric fields due to the collective motion of the Ï electrons themselves and to the external sources are smaller than the atomic crystal field, and also slowly varying on atomic length and time scales. In these conditions, the Ï electrons behave as âquasi-classical particlesâ and the equations governing their dynamics are the classical equations of motion, provided that the electron mass is replaced by an âeffective mass,â which endows the interaction with the positive ion lattice (e.g., [23]).
Section 1.2 presents an electrodynamical model of the propagation along CNTs, derived by using the above-mentioned semiclassical fluid description. This model was presented by Miano and Villone [23] and Maffucci et al. [24] with reference to small-diameter metallic CNTs, and was heuristically extended by Maffucci et al. [25] to metallic CNTs with large diameters. Following the stream of what was done in several studies [26,27], in this work the model is extended to any type of CNTs, both metallic and semiconducting, with any chirality. The model introduces the concept of âequivalent number of conducting channels,â which represents a measure of the number of subbands in the neighbors of the nanotube Fermi level th...
Table of contents
Cover
Half Title
Title Page
Copyright Page
Table of Contents
Preface
Editor
Contributors
Part I Semiconductor Materials
Part II Silicon Devices and Technology
Part III Compound Semiconductor Devices and Technology