graded heterojunction

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• Heterojunction bipolar transistor — The heterojunction bipolar transistor (HBT) is a type of bipolar junction transistor (BJT) which uses differing semiconductor materials for the emitter and base regions, creating a heterojunction. The HBT improves on the BJT in that it that can… …   Wikipedia

• Organic solar cell — An organic photovoltaic cell (OPVC) is a photovoltaic cell that uses organic electronics a branch of electronics that deals with conductive organic polymers or small organic molecules[1] for light absorption and charge transport. The plastic… …   Wikipedia

• Organic light-emitting diode — Demonstration of a flexible OLED device A green emitting OLED device An …   Wikipedia

• Bipolar junction transistor — BJT redirects here. For the Japanese language proficiency test, see Business Japanese Proficiency Test. PNP …   Wikipedia

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• High Electron Mobility Transistor — HEMT stands for High Electron Mobility Transistor, and is also called heterostructure FET (HFET) or modulation doped FET (MODFET). A HEMT is a field effect transistor incorporating a junction between two materials with different band gaps (i.e. a …   Wikipedia

• Silicon-germanium — SiGe (IPA|ˈsɪɡɪː, IPA|ˈsaɪdʒɪ), or silicon germanium, is a general term for the alloy Si1 xGex which consists of any molar ratio of silicon and germanium. It is commonly used as a semiconductor material in integrated circuits (ICs) for… …   Wikipedia

• Heterostructure-emitter bipolar transistor — The Heterojunction emitter bipolar transistor (HEBT), is a somewhat unique arrangement with respect to emitter blocking of minority carriers. This is accomplished by using heterostructure confinement in the emitter, introducing an energy barrier… …   Wikipedia

• MODFET — The modulated doping field effect transistor or modulation doped field effect transistor (MODFET) is a type of a field effect transistor, also known as the High Electron Mobility Transistor (HEMT). Like other FETs, MODFETs are used in integrated… …   Wikipedia

• Semiconductor — Citations missing|date=March 2008A semiconductor is a solid material that has electrical conductivity in between a conductor and an insulator; it can vary over that wide range either permanently or dynamically. [. They are used in many… …   Wikipedia