Category | Device Basics

Metallization Processes for Semiconductor Devices

Posted on 28 February 2019

              Metallization of semiconductors is vital for the connetivity of external conductors, e.g., cables, busbars, etc. The metal plating on the semiconductor is used to create Schottky contacts or Ohmic contacts. Schottky contacts are metallic semiconductor contacts with a rectifying effect. Only majority charge carriers are involved in this [...]

Classification of Film Capacitors

Posted on 20 February 2019

              Film capacitors, also referred to as FK capacitors, are fixed capacitors with plastic film dielectrics. Film capacitors are grouped and designated according to the dielectric used since the dielectric in use has a great effect in determining film capacitor characteristics. Film capacitors are classified further in terms of [...]

IGBT Development - Then and Now

Posted on 09 January 2019

              Since IGBTs were invented, their basic principles have been utilized in different concepts. IGBT chips have therefore been further developed in separate ways, pursuing the objectives and taking the directions outlined for chip technology. In order to both reduce costs by reducing (shrinking) chip area and to get [...]

Characteristics of Schottky Diodes

Posted on 02 January 2019

              Schottky diodes are unipolar components; only one type of charge carrier is responsible for current transmission. While the on-state current is flowing, no excess charge which could appear as storage charge when the diode is turned off (reversed polarity) is built up. This means that Schottky diodes have [...]

Semiconductor Precursors

Posted on 27 December 2019

  Since the advent of electrical engineering, common tasks faced by the electrical engineer have included the conversion of mechanical energy to electrical energy, conversion of electrical energy to other forms of energy such as mechanical energy, heat, light, or other electromagnetic radiation. One challenge that has been of particular importance throughout the history of [...]

Comparison of Power Modules with or without a Base Plate

Posted on 17 December 2019

  Some comparisons of power modules with or without a baseplate are rather inaccurate since they compare the two technologies by examining a module with base plate to begin with and then simply removing the base plate to perform the comparison. Of course, both design variants must be constructed by totally different methods. Both technologies [...]

IGBT Technologies

Posted on 14 December 2019

              Below is an outline of several IGBT technologies that are in common use in the field of power electronics. PT concept The first "Punch Through" (PT) concept, which is still used today as a result of continuous developments, uses a p+ substrate as a base material and n+ [...]

Driver Circuits

Posted on 11 December 2019

  Driver circuits are most commonly used to amplify signals from controllers or microcontrollers in order to control power switches in semiconductor devices. Driver circuits often take on additional functions which include isolating the control circuit and the power circuit, detecting malfunctions, storing and reporting failures to the control system, serving as a precaution against [...]

Rectifier Circuits

Posted on 10 December 2019

              A rectifier circuit is a circuit that converts an alternating supply current into a direct output current, a process called rectification. Rectification is often accomplished by use of rectifier diodes. Such rectifiers are termed uncontrolled rectifiers. Controlled rectifiers, in contrast, generally rely on the use of thyristors, where [...]

Application Fields and Current Performance Limits for Power Semiconductors

Posted on 07 December 2019

  The development of power semiconductors saw the onset of lasting success for power electronics across all fields of electrical engineering. Given the ever increasing call for resource conservation (e.g. energy saving agenda), the use of renewable energies (e.g.wind power and photovoltaics) and the need for alternatives to fossil fuels (e.g. electric and hybrid drives [...]