The barrier between the metal and the semiconductor can be identified on an energy band diagram. This chapter discusses some topics in the physics of metalsemiconductor junctions and metalinsulatorsemiconductor mis junctions. Band gap engineering of the znosi heterojunction using. Electronic structure of 100 semiconductor heterojunctions. The third edition of the standard textbook and reference in the field of semiconductor devices this classic book has set the standard for advanced study and reference in the semiconductor device field. Theory of semiconductor heterojunctions mrs online. Semiconductor heterojunction article about semiconductor. Metalsemiconductor junction an overview sciencedirect topics.
Using a slab model with a small lattice mismatch for the metal1l mos2 heterojunction, a pinning factor of s 0. The longterm stability and superior device reliability through the use of delicately designed metal contacts with twodimensional 2d atomicscale semiconductors are considered one of the critical. These semiconducting materials have unequal band gaps as opposed to a. The band diagram of a pn and metal semiconductor junctions.
Purchase heterojunctions and metal semiconductor junctions 1st edition. Ece department faculty of engineering alexandria university 2015 4. It consisted of a wire tip pressed into a leadsulfide crystal. The electronic structure of 100 abrupt semiconductor heterojunctions has been analysed by means of a selfconsistent tightbinding method. Understanding the collection of electrical separation of. More precisely i dont understand how exactly the flow of carriers is limited on the boundary. Text or symbols not renderable in plain ascii are indicated by. Oxide tco, as well as for rectifying heterojunctions to silicon. Origin of interface states reduction and schottky barrier lowering yonghun kim,1 ah ra kim,1 jin ho yang,2 kyoung eun chang,2 jungdae kwon,1. Ponchak the earliest solidstate device was reported in 1874. The pn junction possesses essential properties for modern electronics. Junctions chapter 11 the physics of semiconductors.
When contacting semiconductor devices one very often includes highly doped semiconductor layers to lower the contact resistance between the semiconductor and the metal contact. To construct such diagram we first consider the energy band diagram of the metal and the. At the interface there usually is a change in, for example, the width of the energy gap. This technique is well known for its merits in the study of the atomic micropotential, the bulk and surface electronic structure, but its specific advantage for analyzing metalsemiconductor. Lateral heterojunctions within monolayer semiconductors. Band gap engineering of the znosi heterojunction using amorphous buffer layers. Heterojunctions and metal semiconductor junctions kindle edition by milnes, a. Formation of electronic devices requires putting together two or more dissim ilar materials semiconductors, metals. Physics and applications of semiconductor heterostructures. This is a pdf file of an unedited manuscript that has been accepted for publication. The junctions, grown by lateral heteroepitaxy using physical vapor transport7, are. Physics of semiconductor devices, 3rd edition wiley. Metal semi conductor junctions agha muqaddas ali khan mesp1501 asad ali mesp1517 2. Chapter 4 metalsemiconductor contacts and semiconductor.
The creation of crystal phase heterostructures of transition metal chalcogenides, e. Understanding the collection of electrical carriers separation of electrons and holes and connections used to distribute current p. A heterojunction is an interface that occurs between two layers or regions of dissimilar semiconductors. Parasuraman,department of metallurgy and material science,iit madras. Pn and metalsemiconductor junctions ee336 semiconductor devices 1. The functions performed by heterointerfaces include passivation, electrical isolation, charge transfer and internal. Sma5111 compound semiconductors lecture 2 metalsemiconductor junctions outline introduction structure what are we talking about. Heterojunctions and metalsemiconductor junctions ebook. Heterojunctions and metal semiconductor junctions 1st. In the present work a study of the electrical properties of heterojunctions. This thesis describes investigations concerning the physics and applications of band edge.
Theory of semiconductor heterojunctions volume 18 j. A pn junction has rectifying currentvoltage iv or iv. Band offsets for the junctions gaasalas, inasgasb and gasb. Lecture 17 metalsemiconductor junction march 14, 2007 contents. Heterojunctions and metal semiconductor junctions, milnes. Schottky barrier models 1 the schottkymott model according to schottky and mott 1938 the height of the barrier. The same is true of an ndoped semiconductor, but the junction between them. I am trying to understand the band diagram of a the metal semiconductor junctions and the pn junction. They are also called schottky contacts to honor walter schottky, a pioneer in. Writing a book on semiconductor device physics and design is never complete and probably never completely satisfying. Voltage dependence of photocurrent in metalsemiconductormetal structures under frontilluminated conditions. Several other combinations of such materials can also form useful junctions. Ternary chalcopyrite semiconductors download ebook pdf. Voltage dependence of photocurrent in metalsemiconductor metal structures under frontilluminated conditions.
Converting a layer of an ntype semiconductor into p type with acceptors would also create a pn junction. New york, academic press, 1972 dlc 79127693 ocolc483608. Purchase semiconductor heterojunctions 1st edition. The article serves as an introduction to a comprehensive list of references on semiconductor heterojunctions. The former topic is treated first in a discussion of the metal. Several methods of producing such structures are given, together with.
501 696 912 923 1370 444 620 1148 185 307 529 44 885 357 1295 37 445 205 309 242 20 739 496 507 224 127 1196 246 1258 120 300 1209 1234 75