TAILIEUCHUNG - Semiconductor MaterialsS. K. Tewksbury Microelectronic Systems Research Center Dept. of Electrical

A semiconductor material has a resistivity lying between that of a conductor and that of an insulator. However, in contrast to the granular materials used for resistors, a semiconductor establishes its conduction properties through a complex quantum mechanical behavior within a periodic array of semiconductor atoms, ., within a crystalline structure. For appropriate atomic elements, the crystalline structure leads to a disallowed energy band between the energy level of electrons bound to the crystal's atoms and the energy level of electrons free to move within the crystalline structure (., not bound to an atom) | Semiconductor Materials S. K. Tewksbury Microelectronic Systems Research Center Dept. of Electrical and Computer Engineering West Virginia University Morgantown WV 26506 304 293-6371 Sept. 21 1995 Contents 1 Introduction 2 2 Crystalline Structures 3 Basic Semiconductor Materials Groups. 3 Elemental IV-IV Semiconductors . 3 Compound III-V Semiconductors. 4 Compound II-VI Semiconductors. 6 Three-Dimensional Crystal Lattice . 6 Crystal Directions and Planes. 7 3 Energy Bands and Related Semiconductor Parameters 8 Conduction and Valence Band. 9 Direct Gap and Indirect Gap Semiconductors . 12 Effective Masses of Carriers . 13 Intrinsic Carrier Densities . 14 Substitutional Dopants. 16 4 Carrier Transport 18 Low Field Mobilities. 19 Saturated Carrier Velocities. 21 5 Crystalline Defects 23 Point Defects. 23 Line Defects. 24 Stacking Faults and Grain Boundaries . 26 Unintentional Impurities. 26 Surface Defects The Reconstructed Surface. 27 1 6 Summary 29 1 Introduction A semiconductor material has a resistivity lying between that of a conductor and that of an insulator. However in contrast to the granular materials used for resistors a semiconductor establishes its conduction properties through a complex quantum mechanical behavior within a periodic array of semiconductor atoms . within a crystalline structure. For appropriate atomic elements the crystalline structure leads to a disallowed energy band between the energy level of electrons bound to the crystal s atoms and the energy level of electrons free to move within the crystalline structure . not bound to an atom . This energy gap fundamentally impacts the mechanisms through which electrons associated with the crystal s atoms can become free and serve as conduction electrons. The resistivity of a semiconductor is proportional to the free carrier density and that density can be changed over a wide range by replacing a very small .

TỪ KHÓA LIÊN QUAN
TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
Địa chỉ : 444 Hoang Hoa Tham, Hanoi, Viet Nam
Website : tailieuchung.com
Email : tailieuchung20@gmail.com
Tailieuchung.com là thư viện tài liệu trực tuyến, nơi chia sẽ trao đổi hàng triệu tài liệu như luận văn đồ án, sách, giáo trình, đề thi.
Chúng tôi không chịu trách nhiệm liên quan đến các vấn đề bản quyền nội dung tài liệu được thành viên tự nguyện đăng tải lên, nếu phát hiện thấy tài liệu xấu hoặc tài liệu có bản quyền xin hãy email cho chúng tôi.
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.