电子信息技术专业英语教学课件ppt作者丁宁Unit2Semiconductor课件.pptVIP

Unit 1 Charge, Current and Voltage 1. circuit n.电路 A closed path followed or capable of being followed by an electric current. 电路：一个通过电流或可通过电流的封闭路径 2. substance n. (1) That which has mass and occupies space; matter. 物体：有质量及占据空间的东西；物质 (2) Material possessions; goods; wealth: 财产；物品；财富： a person of substance. 富有的人 3. insulator n. 绝缘体 (nonconductor) A material that insulates, especially a nonconductor of sound, heat, or electricity. 绝缘体：绝缘材料，特别是声、热、电的非导体 4. silicon n. [化] 硅 半导体 Part One Electronics Unit 2 Semiconductor Preparing for the text: Technical terms: 1. integrated circuit (IC) 集成电路 2. N-type material N型材料 3. P-type material P型材料 4. forward bias 正向偏置 5. reverse bias 反向偏置 6. P-N junction P-N结 Questions for text discussion: Materials can usually be divided into three types, what are they? Conductor, semiconductor, insulator 2. Give some examples about semiconductor materials. Si, Ge 3. Describe the p-n junction electrical properties. see next page After joining p-type and n-type semiconductors, electrons near the p–n interface tend to diffuse into the p region. As electrons diffuse, they leave positively charged ions (donors) in the n region. Likewise, holes near the p–n interface begin to diffuse into the n-type region, leaving fixed ions (acceptors) with negative charge. The regions nearby the p–n interfaces lose their neutrality and become charged, forming the space charge region or depletion layer . The main idea of this unit: This unit mainly discusses the basic knowledge about “semiconductor”. Materials can usually be divided into conductor, semiconductor and nonconductor (2). Their electrical properties altered by the controlled addition of very small quantities of impurities such as boron or phosphorus. New Words 5. electrical adj. 电的，电气的 6. conductivity n. 传导性，导电性 Electrical conductivity 电导性 7. switch