Anglicky v odborných předmětech "Support of teaching technical subjects in English“

1. Anglicky v odborných předmětech"Support of teaching technical subjects in English“ Tutorial: Mechanic - electrician Topic: Technicaltraining II. class Semiconductordevices 1 Prepared by: Melichařík Lubomír Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002 je spolufinancován Evropským sociálním fondem a státním rozpočtem České republiky.

2. SEMICONDUCTOR DEVICES 1 • SEMICONDUCTORS • A semiconductoris a solid material, whose electrical conductivity depends on external or internal conditions, and one can easily change these conditions influence. A change in the external conditions meaning the delivery of some type of energy – usually heat, electricity or light, a change in the internal conditions by introducing a dash of a different element in the semiconductor.

3. SEMICONDUCTOR DEVICES 1 • TYPES OF SEMICONDUCTORS • Among the semiconductor elements are: • -silicon • -germanium • -selenium • -compounds gallium arsenide GaAs • -Lead sulphide PbS • Most semiconductors are crystalline substances, but there are also amorphous semiconductors (some glass)

4. SEMICONDUCTOR DEVICES 1 • SEMICONDUCTOR DIVISION • By structure -organic, inorganic • According to the major charge carriers -n-semiconductors, p-semiconductors • According to the origin of charge carriers –proper semiconductors, step-semiconductors • According to the nature of the jump over mechanisms between the bands -direct semiconductors, indirect semiconductors According to the statistical distribution of the carriers-undegeneratesemiconductor, degenerate semiconductor

5. SEMICONDUCTOR DEVICES 1 • N-type Semiconductor • If we add to pure silicon with four valence electrons an element with five valence electrons (phosphorus, arsenic or antimony), there will be an N-type semiconductor. • P-type Semiconductor • If we endow a silicon element with three valence electrons (boron, aluminum, gallium or indium)a P-type semiconductor is created. • Using semiconductors additives • Semiconductor additives are used in semiconductor devices, primarily in the semiconductor diode and transistor, where they play a crucial role in the P-N junction.

6. SEMICONDUCTOR DEVICES 1 • Semiconductor device • is an electronic device utilized for its functional specific properties as a semiconductor such as germanium (Ge) and silicon (Si) • Semiconductor devices are: Diodes, bipolar and unipolar transistors, thyristors, diacs and triacs.

7. SEMICONDUCTOR DEVICES 1 • BASIC SCHEMATIC SYMBOLS • Electrotechnical schematic symbol for diodes • Electrotechnical schematic symbol for an NPN transistor • Electrotechnical schematic symbol for a PNP transistor

8. Activities for students – mandatory slidesTask, test, questions… . • 1. What is a semiconductor? • 2. Name the types of semiconductors. • 3. How are semiconductors divided? • 4. What is a semiconductor device?

9. Activities for students – mandatory slideTask, test, questions… . Two slides are best. • 1. Draw the schematic symbol for diodes • 2. Draw the schematic symbol for an NPN transistor • 3. Draw the schematic symbol for a PNP transistor

10. Bibliography • Václav Malina Poznáváme elektroniku I. • Adrian Schommers Elektronika tajemství zbavená. ISBN 3-92608-32-5